Prepared For: Naji Akaladiss, Program Manager Brooksville ...Communications and Fairpoint P.O.Box...
Transcript of Prepared For: Naji Akaladiss, Program Manager Brooksville ...Communications and Fairpoint P.O.Box...
Environmental I Civil I Marine I Building-$-CHARTER
Project Title OUllnterim Remediation Report
Callahan Mine Superfund Site
Brooksville Maine
Prepared For Naji Akaladiss Program Manager
Maine Department of Environmental Protection
17 State House Station
Augusta ME 04333
Phone 207-287-7709
Prepared By Charter Environmental Inc
560 Harrison Avenue Suite 500
Boston MA 02118
Phone 857-246-6800
Fax 857-246-6885
Contract No 1252108
PWO No 2-0768
Date September 20 2013
Revision No 00
File Name Interim Closure Report- Phase Ill- REVOO 20130920Docx
S-(f z 3 I LV I ) Pa ~ l Bertolino Project Manager Date Telephone (857) 246-6800 x223
560 Harrison Avenue Boston MA 02118 t 857 2466800 wwwcharterenvironmentalcom
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page ii
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iii
Table of Contents
1 Interim Closure Report 1
2 Introduction 2
21 Phases I amp II 2
22 Phase III 3
3 Residential Lot Repairs 6
31 Lot E Boat Ramp 6
32 Lot A Septic System 6
4 Environmental Management 7
41 Erosion and Sediment Control 7
42 Water Treatment 10
43 Dust Control 10
5 Health and Safety Site Control 10
6 Excavation of PCB Impacted Soils 12
61 Soil Treatment 13
62 Excavation 13
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment 15
7 Transportation and Disposal of PCB Impacted Soils 16
8 Site Restoration amp Demobilization 17
81 Drainage Improvements and EampS Controls at the Former Mine Ops 17
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment 19
9 Project Schedule 20
10 Summary 21
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iv
Tables
Table 1 Subcontractors and Suppliers Page 4
Table 2 Soil Transporters and Disposal Facilities Page 5
Table 3 Disposal Summary for PCB Impacted Soils Page 17
Table 4 Timeline of On Site Activities Page 20
Table 5 PCB Disposal Trucking Dates Page 20
Figures
Figure 1 Contractor Laydown Material Page 9
Stockpile Area
Appendices
Appendix A Model City Disposal Manifests and Weight Slips
Appendix B Crossroads Disposal Manifests and Weight Slips
Appendix C Backfill and Project Material Slips
Appendix D Contractor Production and Quality Control Reports
Appendix E Erosion Control Inspection Reports amp Photos
Appendix F Project Photos
Appendix G Clean Site Road Map
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page v
Abbreviations
BMP Best Management Practices
EPA Environmental Protection Agency
EampS Erosion and Sedimentation
GPS Global Positioning System
HDPE High Density Polyethylene
MEDEP Maine Department of Environmental Protection
MEDOT Maine Department of Transportation
CES CES Engineering
OU1 Operable Unit 1
PCB Polychlorinated Biphenyl
PPE Personal Protective Equipment
PPM Part Per Million
PVC Polyvinyl Chloride
QC Quality Control
RCRA Resource Conservation and Recovery Act
TCLP Toxicity Characteristic Leaching Procedure
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page ii
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iii
Table of Contents
1 Interim Closure Report 1
2 Introduction 2
21 Phases I amp II 2
22 Phase III 3
3 Residential Lot Repairs 6
31 Lot E Boat Ramp 6
32 Lot A Septic System 6
4 Environmental Management 7
41 Erosion and Sediment Control 7
42 Water Treatment 10
43 Dust Control 10
5 Health and Safety Site Control 10
6 Excavation of PCB Impacted Soils 12
61 Soil Treatment 13
62 Excavation 13
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment 15
7 Transportation and Disposal of PCB Impacted Soils 16
8 Site Restoration amp Demobilization 17
81 Drainage Improvements and EampS Controls at the Former Mine Ops 17
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment 19
9 Project Schedule 20
10 Summary 21
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iv
Tables
Table 1 Subcontractors and Suppliers Page 4
Table 2 Soil Transporters and Disposal Facilities Page 5
Table 3 Disposal Summary for PCB Impacted Soils Page 17
Table 4 Timeline of On Site Activities Page 20
Table 5 PCB Disposal Trucking Dates Page 20
Figures
Figure 1 Contractor Laydown Material Page 9
Stockpile Area
Appendices
Appendix A Model City Disposal Manifests and Weight Slips
Appendix B Crossroads Disposal Manifests and Weight Slips
Appendix C Backfill and Project Material Slips
Appendix D Contractor Production and Quality Control Reports
Appendix E Erosion Control Inspection Reports amp Photos
Appendix F Project Photos
Appendix G Clean Site Road Map
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page v
Abbreviations
BMP Best Management Practices
EPA Environmental Protection Agency
EampS Erosion and Sedimentation
GPS Global Positioning System
HDPE High Density Polyethylene
MEDEP Maine Department of Environmental Protection
MEDOT Maine Department of Transportation
CES CES Engineering
OU1 Operable Unit 1
PCB Polychlorinated Biphenyl
PPE Personal Protective Equipment
PPM Part Per Million
PVC Polyvinyl Chloride
QC Quality Control
RCRA Resource Conservation and Recovery Act
TCLP Toxicity Characteristic Leaching Procedure
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iii
Table of Contents
1 Interim Closure Report 1
2 Introduction 2
21 Phases I amp II 2
22 Phase III 3
3 Residential Lot Repairs 6
31 Lot E Boat Ramp 6
32 Lot A Septic System 6
4 Environmental Management 7
41 Erosion and Sediment Control 7
42 Water Treatment 10
43 Dust Control 10
5 Health and Safety Site Control 10
6 Excavation of PCB Impacted Soils 12
61 Soil Treatment 13
62 Excavation 13
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment 15
7 Transportation and Disposal of PCB Impacted Soils 16
8 Site Restoration amp Demobilization 17
81 Drainage Improvements and EampS Controls at the Former Mine Ops 17
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment 19
9 Project Schedule 20
10 Summary 21
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iv
Tables
Table 1 Subcontractors and Suppliers Page 4
Table 2 Soil Transporters and Disposal Facilities Page 5
Table 3 Disposal Summary for PCB Impacted Soils Page 17
Table 4 Timeline of On Site Activities Page 20
Table 5 PCB Disposal Trucking Dates Page 20
Figures
Figure 1 Contractor Laydown Material Page 9
Stockpile Area
Appendices
Appendix A Model City Disposal Manifests and Weight Slips
Appendix B Crossroads Disposal Manifests and Weight Slips
Appendix C Backfill and Project Material Slips
Appendix D Contractor Production and Quality Control Reports
Appendix E Erosion Control Inspection Reports amp Photos
Appendix F Project Photos
Appendix G Clean Site Road Map
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page v
Abbreviations
BMP Best Management Practices
EPA Environmental Protection Agency
EampS Erosion and Sedimentation
GPS Global Positioning System
HDPE High Density Polyethylene
MEDEP Maine Department of Environmental Protection
MEDOT Maine Department of Transportation
CES CES Engineering
OU1 Operable Unit 1
PCB Polychlorinated Biphenyl
PPE Personal Protective Equipment
PPM Part Per Million
PVC Polyvinyl Chloride
QC Quality Control
RCRA Resource Conservation and Recovery Act
TCLP Toxicity Characteristic Leaching Procedure
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page iv
Tables
Table 1 Subcontractors and Suppliers Page 4
Table 2 Soil Transporters and Disposal Facilities Page 5
Table 3 Disposal Summary for PCB Impacted Soils Page 17
Table 4 Timeline of On Site Activities Page 20
Table 5 PCB Disposal Trucking Dates Page 20
Figures
Figure 1 Contractor Laydown Material Page 9
Stockpile Area
Appendices
Appendix A Model City Disposal Manifests and Weight Slips
Appendix B Crossroads Disposal Manifests and Weight Slips
Appendix C Backfill and Project Material Slips
Appendix D Contractor Production and Quality Control Reports
Appendix E Erosion Control Inspection Reports amp Photos
Appendix F Project Photos
Appendix G Clean Site Road Map
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page v
Abbreviations
BMP Best Management Practices
EPA Environmental Protection Agency
EampS Erosion and Sedimentation
GPS Global Positioning System
HDPE High Density Polyethylene
MEDEP Maine Department of Environmental Protection
MEDOT Maine Department of Transportation
CES CES Engineering
OU1 Operable Unit 1
PCB Polychlorinated Biphenyl
PPE Personal Protective Equipment
PPM Part Per Million
PVC Polyvinyl Chloride
QC Quality Control
RCRA Resource Conservation and Recovery Act
TCLP Toxicity Characteristic Leaching Procedure
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page v
Abbreviations
BMP Best Management Practices
EPA Environmental Protection Agency
EampS Erosion and Sedimentation
GPS Global Positioning System
HDPE High Density Polyethylene
MEDEP Maine Department of Environmental Protection
MEDOT Maine Department of Transportation
CES CES Engineering
OU1 Operable Unit 1
PCB Polychlorinated Biphenyl
PPE Personal Protective Equipment
PPM Part Per Million
PVC Polyvinyl Chloride
QC Quality Control
RCRA Resource Conservation and Recovery Act
TCLP Toxicity Characteristic Leaching Procedure
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page vi
This page left blank intentionally
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 1
1 Interim Closure Report
Charter Environmental Inc (Charter) was contracted by the State of Maine acting through the
Maine Department of Environmental Protection to perform site remediation services at the
Callahan Mine Superfund Site in Brooksville Maine The scope of work was defined by the
specifications for Operable Unit 1 (OU1) which includes
Final Basis of Design Report (MACTEC 2010)
Addendum to the Final Basis of Design Report (CES Nov 22 2010)
Project Specifications
Project Approved Work Plan
At the request of the government organizations managing this site Charter is providing this
closure report for the work performed from May 6 2013 to September 20 2013 This work is a
continuation of the initial remediation effort performed by Charter from April 11 2011 to
January 11 2012 as well as the additional remediation performed from September 3 2012 to
November 8 2012
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 2
2 Introduction
21 Phases I amp II
The Callahan Mine Superfund Site is located off Cape Rosier Road and Old Mine Road in the
Town of Brooksville Maine The site was formerly the location of a zinccopper open‐pit mine
It was mined sporadically from the late 1800rsquos to the 1970rsquos The most extensive open‐pit
mining operations started in 1968 and ran until 1972
In 2011 Charter initially mobilized to the Callahan Mine site to perform the remediation of PCB
impacted soils at the Former Mine Operations area removal and relocation of lead and arsenic
impacted soils from within the residential areas and associated restoration work as well as the
relocation of the Ore Pad material to the Tailings Impoundment and associated geotechnical
investigations
Following a sample program implemented by the EPA in the fall of 2011 new areas of PCB
contamination were discovered within the Former Mine Operations area The Maine DEP and
CES developed a new scope of work for the approach to remediation of these areas Plans and
specs for this new scope were issued to Charter in the fall of 2012 Charter remobilized to the
site in the fall of 2012 to perform the remediation of these additional areas Charterrsquos scope of
work under this phase of work included earthmoving and sitework related tasks Engineering
survey sampling and characterization efforts were performed by CES in conjunction with the
Maine DEP Remedial efforts were performed under the direction and supervision of the Maine
DEP as well as CESrsquos full time on site representative
The remediation efforts performed under this Phase of work included the following
Construction of a drainage swale and other site features to control storm runoff in the
Former Operations area site access roads and other areas of disturbed soil on site
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area Depending on contamination levels the soils were shipped to landfills in
Model City New York Norridgewock Maine or relocated on site
Construction of a stockpile area and cap for PCB soils with contamination levels from 1‐10
ppm within the previously constructed Ore stockpile located at the Tailing Impoundment
At the completion of this phase of work Zones 1 and 2 had been remediated in their entirety
and the associated PCB impacted soils where appropriately shipped off site for disposal or
relocated to the Tailings Impoundment stockpile area The stockpile at the Tailings
Impoundment was also covered with geotextile and a cap of former Ore Pad material was
placed over the 1‐10ppm PCB impacted soils Following the completion of these tasks Charter
demobilized equipment manpower and temporary facilities from the site
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 3
22 Phase III
In May of 2013 Charter remobilized to the site to continue remediation efforts in Zones 3 amp 4
Other activities also planned under this phase of work included
Perform repairs to the boat ramp previously installed at Lot E as well as the septic system at
Lot A
Excavation and loading of PCB‐contaminated soils from within the former Callahan Mine
Operations area at Zones 3 amp 4 Depending on contamination levels the soils will be shipped
to landfills in Model City New York Norridgewock Maine or relocated on site
Construction of an additional stockpile area and cap for PCB soils with contamination levels
from 1‐10 ppm within the previously constructed Ore stockpile located at the Tailing
Impoundment
Restoration of the Former Mine Ops area following the completion of remediation of Zones 3
amp 4 This is to include the placement of onsite organic materials to promote growth of
vegetation as well as construction of various erosion control and drainage features
The following sections will detail the work performed at the site from May 6 2013 to September
20 2013 The work was performed per the plans and specifications provided and in accordance
with the approved Work Plan and Work Plan Addendum which was developed to document site
observations provide a description of our planned approach and outline the work sequence
Work performed on the site was documented in the daily Contractor Production
ReportsContractor Quality Control Reports A copy of each report is provided in Appendix A
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 4
Table 1 lists the sub‐contractors and suppliers that were utilized during the project
Table 1 Subcontractors and Suppliers
Role Company Name Address Telephone
Materials Supplier KJ Dugas Construction PO Box 298 207‐667‐5765
Surry ME 04684
Blasting Subcontractor Maine Drilling and 423 Brunswick Avenue 800‐370‐2338
Blasting Gardiner ME 04345
Electrical Subcontractor John H Gray Electric PO Box 10 207‐326‐8229
19 Breezemere Road
Brooksville ME 04617
Erosion Control and AH Harris 54 Perry Road 207‐262‐6276
Construction Materials Bangor ME 04401
Erosion Control and US Construction Fabrics 8 Ledge Road 603‐893‐5480
Construction Materials Windham NH 03087
Plumbing Subcontractor Robert L Gray Plumbing 8 Wharf Road Brooksville 207‐326‐4788
and Heating ME 04617
Erosion Control Mulch Casella Organics 1100 Waterville Rd Unity 888‐312‐9637 ME 04988
Landscaping amp Clearing Rosengren Landscaping 4 Lambert Road 207‐865‐3405
Subcontractor Freeport ME 04032
Machinery Anderson Equipment 142 Target Industrial Circle 207‐942‐0177
Bangor ME 04401
Communications and Fairpoint PO Box 11560 866‐984‐2001
Overhead Utilities Communications Portland ME 04104
Fuel Wardwell Oil 419 Reach Road 207‐359‐8953
Sargentville ME 04673
Vactor Services Clean Harbors 40B Carey Circle 207‐262‐9504
Hampden ME 04444
Liner Subcontractor RTD Enterprises 196 Old Point Ave 207‐696‐3964
Madison ME 04950
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 5
Table 2 lists the transporters and disposal facilities that were used during the project
Table 2 PCB Transporters and Disposal Facil i t ies
Role Company Name Address Telephone
Remediation Contractor Charter 560 Harrison Ave 857‐246‐6800
Boston MA 02118
Transporters
gt50 ppm PCB Soil Goulet Trucking Inc
lt50 ppm PCB Soil TRT Management
gt50 ppm PCB Soils CWM Chemical Services
LLC
20 Industrial Drive W
South Deerfield MA 01373
PO Box 449 Milford ME 04461
1550 Balmer Road
Model City NY 14107
413‐665‐1323
207‐356‐0695
716‐754‐2484
Facilities
lt50 ppm PCB Soils Waste Management 357 Mercer Road 207‐634‐2714
Disposal Services of PO Box 629
Maine ‐ Norridgewock ME 04957
Crossroads Landfill
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 6
3 Residential Lot Repairs
During Charterrsquos initial week on site during this phase of work prior to the start of excavation
activities at the Former Mine Ops repairs were performed at two of the Residential lots that
were remediated under the first phase of work in 2011
31 Lot E Boat Ramp
Since the installation of the Boat Ramp at Lot E observations were made by the Maine DEP and
CES that material placed at the end and sides of the ramp were being washed out by the heavy
current produced from Goose Falls during tide changes
To remedy this situation additional large rip rap was placed at both sides of the ramp by Charter
in an effort to minimize tidal effects on these areas The material was placed with a PC300
excavator Any disturbance to the boat ramp landing that was caused by equipment being
utilized during this work was restored prior to Charter removing equipment from this area
Additionally at the request the Maine DEP and CES Charter also placed additional rip rap at the
base of the Boat Ramp prior to demobilization from the site to ensure that the potential for
washouts in this area had been minimized to the greatest extent possible utilizing practical
means and methods and on site equipment
32 Lot A Septic System
Following the repair of the Boat Ramp Charter also provided manpower and equipment to
repair the effluent septic line from the dwelling at Lot A Over the previous summer season the
residents at Lot A had reported poor performance of their septic system Upon further
inspection by a local plumbing contractor it was determined that a section of the PVC pipe
which ran from the dwelling to the septic tank had settled and was not allowing proper effluent
flow in the pipe
The first step in defining a remedy for this situation was to excavate the pipe run in its entirety
from the dwelling to the septic tank Following excavation of the pipe run it was determined
that the appropriate course of action would be to install new frac34rdquo crushed stone bedding
material set the proper grade and pitch and replace the pipe run in its entirety In addition it
was also determined that the pipe passing through the field stone foundation would have to be
removed and replaced reset to ensure that the pitch of the pipe was adequate and consistent
throughout the run from the dwelling to the tank The PVC cleanout within the dwelling was
also reconfigured to accommodate this modification
This work was performed by Charter in conjunction with Robert L Gray Plumbing and Heating
who has extensive knowledge of the dwelling and local plumbing codes Excavation was
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 7
performed by Charter utilizing a mini excavator Digging was also performed by hand when
necessary Following the installation activities the excavation was backfilled and topsoil that
was stripped at the start of the repair was re‐spread Re‐establishment of grass in the affected
area was handled by a local landscaper contracted by the Maine DEP
4 Environmental Management
41 Erosion and Sediment Control
Erosion and Sedimentation (EampS) controls were installed in compliance with the State of Maine
Department of Environmental Protection Best Management Practices (BMPs) and the approved
work plan Additional hay bales erosion control mulch silt fence coir logs and stone for check
dams was delivered to the site and installed as needed to ensure that existing and proposed EampS
controls could be maintained and repaired as needed
Initial BMPs installed to control surface storm water erosion and sedimentation included but
was not limited to
E amp S Control Improvements at the Tailings Impoundment Stockpile Area
In an effort to control erosion and sediment transportation in the area of the 1‐10 ppm PCB soil
stockpile area a drainage swale was constructed on the western edge of the proposed stockpile
area The swale was constructed prior to any construction of the stockpile area being
performed
The swale started at the main site access road and proceeded to the north north east along the
western edge of the Ore material stockpile placed at Tailings during the 2011 remediation work
Stone check dams were also installed as required over the length of the swale The swale layout
is also show on drawing C‐SP02 provided to Charter by CES
The swale transition from the previously stockpiled Ore material to Tailings was constructed
under the direction and supervision of the Maine DEP and CES This transition area was
constructed by first re‐grading existing ore material with an excavator then lining this area of
the swale with onsite HDPE liner and placing rip rap over the liner The liner material was cut
into sections and shingled to prevent backflow of water under the liner A plunge pool was also
constructed at the base of the rip rapped slope From the plunge pool the swale was continued
to connect to an existing swale that was constructed on the Tailings during the 2011 work
Excavation performed on Tailings was done with a mini excavator to minimize the potential
impact to the underlying Tailings material
Following completion of the swale groundwater was observed exiting the wooded slope up
gradient of the northern end of the swale In an effort to direct this water into the swale and
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 8
prevent the potential for uncontrolled erosion and sediment transport a lined and rip rapped
extension of the swale was constructed extending to the west to the edge of the wooded area
where the groundwater had been observed exiting the slope
Site Access Road Improvements
In conjunction with the installation of the drainage swale discussed above there were also
improvements and modifications made to the clean site access roads in multiple areas around
the site
Improvements started with the road leading from the main site access road down to the 1‐10
ppm PCB soil stockpile at the Tailings Impoundment This included the installation of a crossing
over the new drainage swale This crossing was constructed with 6rdquo stone at a depth sufficient
to allow storm runoff to pass through the stone and facilitate rock truck traffic to travel over the
stone without damaging the swale Rip rap was also added to the road up gradient from the
swale crossing to improve rock truck access over a historically wet area
Site access road improvements were also made in the former Mine Ops area This included the
use of clean gravel to construct a truck turnaround in Zone 2 so that trucks waiting to be loaded
with soil for offsite TampD could be staged more effectively Lastly the existing site access road
was also extended from the northern edge of Zone 3 to CESrsquos decontamination area for better
access to remediation areas
A figure showing approximate locations of clean roads constructed through Mine Ops can be
found in Appendix G
1‐10 ppm PCB Soil Stockpile at the Tailings Impoundment
BMPs were used to control erosion and sedimentation during the placement of the 1‐10 ppm
PCB impacted soils within the stockpile at the Tailings Impoundment Ore cover material that
was excavated for the placement of the additional 1‐10 material was cast upslope into a berm
between the containment cell and swale discussed in previous sections The berm of displaced
Ore material remained in place until it was utilized in the capping operations
Relocated 1‐10 ppm PCB impacted material was graded to a 10 slope at lower elevations and
transitioned to a 31 slope near the top of the stockpile to shed any storm water that fell
directly on the material During construction the toe of the slope of the 1‐10 ppm PCB soils was
also kept below the grade of the surrounding Ore material to prevent any runoff or sediment
from exiting the containment cell
In addition to the practices listed above the access roads leading to and from this stockpile area
were maintained on a regular basis to keep mud tracking and associated sediment transport to a
minimum
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 9
Construction Material Stockpiles
The stockpile area built for incoming construction materials during the 2012 phase of work
located between the Former Mine Operations area the Tailings Impoundment was maintained
for this phase of work Large stockpiles of clean materials were not kept on site to keep the
potential for erosion to a minimum No erosion was encountered in this area over the duration
of this phase of work
Figure 1 Contractor Laydown Stockpile Area
Contractor Laydown Areas
The stone pad previously installed at the jobsite trailer and conex boxes to control mud in the
area was kept and maintained as needed during the duration of the work The laydown area
for Construction Material Stockpiles (as shown above) was maintained for this phase of the
Project Erosion and sedimentation controls were as noted above
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 10
Charter maintained and improved upon the EampS control measures listed above as necessary to
ensure that erosion and sediment was controlled throughout the course of the project Charter
inspected these BMPs on a daily basis
42 Water Treatment
Charter installed and maintained an onsite water treatment system during this phase of work
The water system was utilized for the dewatering of active excavation areas and removal of soil
sediment that could potentially contain PCBrsquos The system consisted of a 10000 gallon frac tank
to be used for water storage and settlement of suspended solids and (2) bag filter units plumbed
in series The first of the bag filter units contained a 25 micron filter the second bag filter unit
contained a 1 micron filter
Following treatment the water was sampled by CESrsquos on site engineer to ensure the treatment
systemrsquos effective operation Water was discharged to the small detention basin located
between Zones 2 and 3 which also contained a culvert to connect the basin to the swale that
was blasted through the area of bedrock during the 2012 work The effluent hose was
discharged into an area of filter fabric to prevent any additional erosion from within the basin
The effluent hose was later discharged directly into the culvert due to issues with water
infiltration in the area
43 Dust Control
A 2400 gallon water truck was used to provide dust control to the site Water for dust control
activities was pumped from Goose Pond for use in the Former Mine Operations road and site
access road The water truck was also used to supply pressure washers as needed for ledge
cleaning and decontamination operations
5 Health and Safety Site Control
Throughout the duration of the project Charter adhered to the approved Accident
PreventionSite Safety and Health Plan (HASP) All subcontractors and other personnel entering
and working on the site were also briefed on the HASP and potential safety hazards associated
with ongoing site activities Weekly safety meetings were also held on various subjects with
Charter personnel
Control of PCB Contaminated Excavation Areas
Contaminated soils were controlled through the use of site control zones which included an
exclusion zone (Mine Operations) a contamination reduction zone (southern end of Mine Ops)
and a support zone (lay down area between Mine Ops and the Tailings Impoundment as well as
the northern laydown area with the jobsite trailer and conex boxes) The extent and relative
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 11
positions of the control zones changed during the progressive stages of the excavation areas
during the project The limits of these control zones were adjusted as site‐specific conditions
relative to location and size of the excavation area(s) became defined The control zones were
established using caution tape paint or flagging to identify that these areas were exclusion
zones
Charter personnel required to enter contaminated areas were outfitted with modified Level D
PPE This consisted of a Tyvek suit latex or rubber gloves safety glasses and a hard hat PPE
levels were modified as needed by the task that was being performed Each worker required to
enter contaminated areas was also issued a dedicated pair of rubber boots to be used only in
the exclusion zones to further prevent tracking of contaminated soils When not in use these
dedicated boots were kept in a container within the exclusion zone and at the projectrsquos end
these boots were sent off site for disposal with other contaminated PPE
Support Zone
The northern support zone contained temporary administrative facilities where Charter
handled communications emergency response and coordination of daily field operations
Communications equipment included hand held cell phones and site ldquowalkie talkiesrdquo The
sanitary facilities safety equipment medical supplies and construction equipmentmaterials
were stored in this area The support zone between Mine Ops and the Tailings Impoundment
contained sanitary facilities and imported sand stone and mulch for incorporation into the
work
All site visitors were required to sign in and be briefed on the Health amp Safety precautions to be
taken while on site At a minimum each visitor was issued a hard hat and high visibility vest to
be worn while visiting the site
Contamination Reduction Zone
A contamination reduction zone was established as a safety buffer to limit access to the
exclusion zone The contamination reduction zone was placed adjacent to the exclusion zone
perimeter and provided a physical separation of the support zone and exclusion zone
The contamination reduction zone provided an entry for personnel vehicles and equipment into
the exclusion zone and an exit area for decontamination of personnel materials and equipment
from the exclusion zone The contamination reduction zone was identified with paint lines and
lined with poly sheeting to physically separate the zones and to allow for adjustments to the size
and location due to changing site conditions A boot wash plastic garbage bags for used
Personal Protective Equipment (PPE) extra PPE dedicated rubber boot container and
decontamination supplies were placed in this area for use while entering and exiting the
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 12
exclusion zone Used PPE was placed in garbage bags and stored in the greater than 50ppm PCB
stockpile area for disposal with the soil
Exclusion Zone
The exclusion zone or hot zone was the area containing PCB contaminated soils in the Former
Mine Operations area as well as the 1‐10 ppm PCB soil stockpile area at the Tailings
Impoundment Since work activities were conducted at different locations within Former Mine
Operations area each excavation area had its own delineated exclusion zone The exclusion
zone included all areas that have been identified having PCB contamination During the
excavation of the PCB soils the exclusion zone was marked by caution tape paint flagging or
other temporary barriers Access and egress from the exclusion zone was through the
contamination reduction zone Personnel and equipment leaving the exclusion zone underwent
decontamination procedures
Heavy Equipment Decontamination
To prevent transport of contamination construction equipment and vehicles were
decontaminated at temporary decontamination areas within the contamination reduction zone
immediately after exiting the exclusion zone Decontamination procedures included dry
decontamination to remove the bulk of impacted soils followed by a double washrinse method
as described in the work plan Wash water produced during these decontamination procedures
was captured and pumped into steel drums Drummed decontamination water was then
processed through the onsite water treatment system
Decontamination water produced from the cleaning on the onsite frac tank at completion of
remediation activities was disposed of by being added to the final load of greater than 50 ppm
soils shipped off site during this phase Water was added immediately prior to load out
Following load out the excavator bucket was decontaminated over the final load of greater than
50 ppm PCB soil being shipped off site
6 Excavation of PCB Impacted Soils
After mobilizing to the site and performing site prep and the installation of EampS controls Charter
started work associated with the PCB contaminated soils located at the Former Mine Operations
area The contamination areas as delineated on the plans were divided up into areas of PCB
concentrations of greater than 50 ppm 10 ndash 50 ppm and 1‐10 ppm Excavation started within
Zone 3 with Zone 4 excavation started shortly thereafter Excavation activities were prioritized
by contamination level as well as soil treatment requirements
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 13
61 Soil Treatment
Prior to the start of excavation and loading of the PCB impacted soils accessible 10‐50 ppm PCB
and greater than 50 ppm PCB areas in Zones 3 and 4 that were identified during the ME DEPCES
sampling activities as having a leachable characteristic for lead were treated on‐site This
activity was performed prior to excavation activities due to the lead time associated with lab
testing for TCLP lead and mobilizing the treatment chemical to the site
Treatment was performed using a 1 mix ratio per weight of buffered phosphate treatment
chemical to soil quantity being treated Treatment was done by excavating the soils to be
treated into a pile at an accessible edge of the contamination area Soils were then treated in
situ with the appropriate amount of treatment chemical followed by the soil being flipped and
turned onto itself with an excavator bucket until the soil was thoroughly mixed Sampling of the
soils following treatment was performed by CES and submitted for analytical testing
62 Excavation
Initial onsite delineation for Zones 3 amp 4 was performed by CES prior to Charterrsquos mobilization to
the site Delineation consisted of numbered stakes consistent with the point locations shown
on the plans Differing contamination levels were delineated using flagging and caution tape
When working within contaminated areas Charter equipment was allowed to track from levels
of lower contamination to levels of higher contamination When tracking from levels of higher
contamination to lower levels decontamination of equipment was performed to prevent
tracking of soils Where feasible geotextile or poly sheeting was utilized to ldquobridgerdquo equipment
over certain contamination areas This was done to minimize required equipment
decontamination and to expedite the performance of the work
Following the layout of the contaminated areas excavation activities started on May 14 2013
Initial excavations were performed to a depth of 6rdquo or 12rdquo from the existing ground surface
depending on contamination levels and localized sampling results Deeper excavations were
performed as progression of the work and sequencing allowed Working stockpiles as
referenced in the previously approved Work Plan Addendum were utilized to expedite
completion of the work Grade control of excavation areas was done utilizing an optical level
and a stadia rod Grade control for excavation depths was maintained throughout the course of
remediation activities
EPA Mobile Lab
Confirmation samples for the PCB excavation areas were taken by CES and the Maine DEP
These samples were then submitted to the EPA mobile lab for analysis Soil samples that
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 14
required TCLP testing for leachable lead were sent to an offsite lab During weeks when the EPA
mobile lab was not onsite samples were taken to an offsite lab
Zone 3 amp 4 Excavation
Following the completion of site preparation and installation of EampS controls excavation of
Zones 3 amp 4 began at the Former Mine Operations area Excavation was performed in
conjunction with soil treatment in an effort to expedite offsite shipment of soils Zones 3 amp 4
were remediated concurrently as equipment and manpower availability allowed
Zone 3 Remediation
Extensive re‐excavations were required in Zone 3 Most of these re‐excavations were within or
centered around areas 3‐A‐2‐2 and 3‐B‐2‐2 Excavation depths ranged from 6rdquo to 2rsquo depending
on PCB concentrations encountered Large quantities of gt50ppm PCB soils were excavated
from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more CES has a
full record of sample locations re‐excavation areas and levels of contamination Charter
performed the re‐excavations as directed by CES until all confirmation samples produced clean
results
During re‐excavations ledge was encountered in areas 3‐A‐2‐2 and 3‐A‐1 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning
contaminated soil from the exposed ledge Clean Harbors of Hampden Maine provide the
Vactor truck and labor crew for this activity
Following completion of the remediation of Zone 3 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
Zone 4 Remediation
Extensive re‐excavations were also required in Zone 4 Most of these re‐excavations were
within or centered around areas 4‐B‐2 and 4‐B‐1‐2 Excavation depths ranged from 6rdquo to 3rsquo
depending on PCB concentrations encountered Large quantities of gt50ppm PCB soils were
excavated from both of these areas Multiple areas had to be re‐excavated 3‐4 times or more
CES has a full record of failed sample locations re‐excavation areas and levels of contamination
Charter performed the re‐excavations as directed by CES until all confirmation samples
produced clean results
During re‐excavations weathered bedrock was encountered in area 4‐B‐2 Multiple approaches
were utilized to clean the ledge and weathered bedrock to extent required by MEDEP and EPA
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 15
These approaches included sweeping power brooming power washing and vactoring As a
result of discussions had with the MEDEP and CES itrsquos was determined that using a vactor
assisted with a crew of laborers was in the best interest of the project for cleaning contaminated
soil from the exposed ledge Clean Harbors of Hampden Maine provide the Vactor truck and
labor crew for this activity
During re‐excavations concrete was also encountered in various locations within Zone 4
Sampling was utilized to determine if the concrete was contaminated with PCBrsquos as well as
whether or not the contaminated concrete would be relocated onsite or disposed of offsite
Concrete was cleaned andor power washed as necessary prior to sampling Once
contamination levels of the concrete was determined the concrete was broken up with an
excavator mounted hydraulic hammer and segregated for proper disposalrelocation This
approach was also utilized for the demolition of clean and contaminated concrete associated
with the Secondary Crusher building located within the former area 2‐A‐4
Following completion of the remediation of Zone 4 the area was rough graded for positive
drainage and to facilitate the placement of Stink Cove sediment Fill material was mined from
the Ore Pad as well as Zone 2 and used to fill in deeper excavations as needed
63 1‐10 ppm PCB Stockpile at the Tailings Impoundment
While the excavation and offsite disposal activities were being performed in the Former Mine
Ops construction of the 1‐10 ppm PCB stockpile area at the Tailings Impoundment was ongoing
The 1‐10 ppm PCB stockpile area was located within the foot print of the Ore stockpile
previously placed during the 2011 and 2012 phases of work This new 1‐10 ppm PCB soil was
also partially located on previously stockpiled 1‐10ppm PCB soils (placed during 2012 work) and
native soils Initial layout of the limits of the stockpile area was performed by the MEDEP and
CES Following layout Charter began excavating the area for the placement of the 1‐10 ppm
PCB material
The area for the stockpile was split into two adjacent cells The first cell was constructed at the
northern end of the Ore stockpile with second constructed to the south once space constraints
prevented effective placement of additional soils within the northern cell Ore cover material
excavated from the cells was cast upslope and formed into a berm while awaiting completion of
the placement of the 1‐10 ppm PCB material Ore cover material was excavated to the top
elevation of 1‐10 ppm PCB soils placed during the 2012 phase of work In areas where native
soils existed within the proposed stockpile area any topsoil was stripped and the existing
subsoil was used as a base for the stockpile
Following excavation the cells were lined with a demarcation layer of 12oz geotextile fabric
The fabric panels were overlapped on all seams to prevent potential gaps in the fabric Once
fabric was in place filling of the cell began
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 16
The stockpile area was filled from north to south The stockpile area was also filled vertically in
layers to accommodate any modifications in the final stockpile design elevations and cover
system
Following the final grading of the 1‐10 ppm PCB material the cap was installed by re‐grading the
previously relocated berm of Ore material back over the 1‐10 ppm PCB material Due to the
insufficient quantity of accessible Ore material at the Tailings Impoundment borrow material
was also mined from Waste Rock Pile 2 and gravel areas in the previously remediated Zone 2 to
compensate for this deficit The cover material was graded in an 18rdquo depth over the 1‐10 ppm
PCB stockpile area On the western edge the cover material was blended into the existing
grades of the drainage swale installed under this phase of work On the eastern and northern
edges the cap was blended to meet the existing grades of the undisturbed Ore
7 Transportation and Disposal of PCB Impacted Soils
In conjunction with ongoing excavation activities soils were also loaded into dump trailers for
transportation and disposal to offsite facilities
Characterization of soils to be shipped off site was performed by CES The excavated materials
were shipped off site under the following disposal characterizations
Greater than 50ppm PCB material (Model City Landfill NY)
Profile NY302494 ‐ Soil Passing TCLP Pb
Profile NY303916 ‐ Soil Initially Failing TCLP Pb and then treated on‐site to eliminate the
leaching hazardous characteristic
Soils being disposed of at Model City were transported by Goulet Trucking Inc Their contact
information can be found in Table 2
Less than 50ppm PCB material (Crossroads Landfill Norridgewock ME)
Profile 522435ME ‐ Soil Passing TCLP Pb
Soils being disposed of at the Crossroads Landfill were transported by TRT Management
Their contact information can be found in Table 2
The trucking manifests for greater than 50 ppm PCB material are located in Appendix A
The trucking manifests for less than 50 ppm PCB material are located in Appendix B
Truck Route
For this phase of the project trucks were routed down Route 15 from Bucksport to Blue Hill
Maine From here the trucks took Route 176 around the western side of the island followed by
a right onto Cape Rosier Road leading to the site entrance This route was chosen to avoid a
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 17
narrow hill located in Buckrsquos Harbor and to minimize impact on local residents Any trucks using
Varnumville Road were turned away from the project
Loadout Procedures
Trucking of PCB impacted soils started on May 15 2013 Trucks were backed onto poly sheeting
and loaded by an excavator Trucks were only allowed to travel over clean surfaces and were
not allowed to travel over any contaminated areas
For trucks using removable bows for support of their trailer tarps bows were removed or swung
to the side of the trailer by the truck driver prior to loading Following the trailer being loaded
with soil bows were secured by a Charter laborer from a ladder against the outside of the
trailer This procedure was implemented to eliminate the safety and cross contamination
hazards associated with the truck driver or on site personnel entering a trailer loaded with PCB
contaminated soils
Disposal manifest and weight tickets can be found in Appendix K
Table 3 Disposal Summary for PCB Impacted Soils
Material Total Quantity
Greater than 50 ppm PCB Soil 21539 Tons
Less than 50 ppm PCB Soil 28372 Tons
8 Site Restoration amp Demobilization
81 Drainage Improvements and EampS Controls at the Former Mine Ops
Drainage Swale
Upon completion of PCB contaminated material excavation and associated work at the Former
Mine Operations area limited restoration activities were started at Zone 3amp4 This included
lining of the drainage swale on the eastern edge of the Former Mine Ops installed during the
2012 phase of work The swale was lined with HDPE liner material provided to Charter by the
MEDEP Liner material was procured by MEDEP from another project site The liner material
was cut to appropriate sizes to fit the swale and shingled to minimize the backflow of water
under the liner sections
Wet Pond and Outlet Structures
Following the lining of the drainage swale a wet pond was constructed at the northeastern
corner of Zone 3 in the area of the former 3‐A‐5 10‐50 ppm PCB soil excavation Preliminary
work for the installation of the wet pond included the grading and shaping of the former
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 18
excavations and re‐excavations in the area to form the subgrade for the wet pond This
subgrade was achieved utilizing existing material in the area as well material mined from Waste
Rock Pile 2 and areas in Zone 2
During the shaping and grading work a HDPE standpipe and outlet structure was installed to
drain water from the wet pond Excavation of the linerrsquos anchor trench was also performed A
level spreader and plunge pool were also installed at the outfall of the outlet structure Ledge
encountered during the install of these items was removed to the extent necessary using an
excavator mounted hydraulic hammer
Following the completion of these preparation tasks Charterrsquos liner subcontractor was
mobilized to the site to install a 40 mil textured HDPE liner over the foot print of the wet pond
as well as the forebay of the wet pond The subcontractor utilized for the installation of the
liner system was RTD Enterprises a Maine based company Their contact information can be
found in Table 2
Stink Cove Sediment
The Stink Cove sediment was mined from an onsite area to the southeast of and up slope from
the former Mine Ops Following the clearing of trees and construction of a temporary road for
access to this material excavation of Stink Cove sediment was performed using an excavator
and the material was loaded into rock trucks for relocation to the Former Mine Ops Charter
also added an additional rock truck and bull dozer to the onsite crew as requested by the
MEDEP to expedite the process of relocating and placing Stink Cove material
Once the drainage improvements described above were completed and subgrade was
established Stink Cove material was spread throughout Zones 3amp4 as a loam substitute to
promote grass growth The Stink Cove sediment was placed in an approximate 6rdquo lift over Zones
3amp4 as allowed by the subgrade material
Site Road Improvements
In conjunction with placement of Stink Cove sediment improvements were also made to the
site access road through Zones 3amp4 This included the re‐grading of the existing subgrade and
placement of a 12rdquo lift of processed gravel over the area of the site access road from the
southernmost extent of Zone 4 to where Zones 34 meet Zone 2
Hydroseeding and Stabilization
To stabilize areas disturbed within the Former Mine Ops during remediation activities
hydroseed was applied to the Stink Cove Sediment placed in Zone 3 (35200 sf) Zone 4 (31500
sf) as well as Waste Rock Pile 2 (33075 sf) Erosion control blanket was also used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 19
82 1‐10 ppm PCB Soils Stockpile at the Tailings Impoundment
Stink Cove Sediment
Following the completion of the non‐woven geotextile and soil cap for the 1‐10 ppm PCB
impacted soils stockpiled at the Tailings Impoundment the capped area was covered with a 6rdquo
lift of Stink Cove Sediment 31 slopes that received the stink cove sediment material were also
hydroseeded prior to Charter demobilization from the site to stabilize the area
Bought materials and other project associated items were also relocated to the Battery Building
at the request of the DEP so that these materials will be centrally located and can be inventoried
for any follow on work at site Any remaining gravel or stone stockpiles remaining on site were
left in place
Hydroseeding and Stabilization
To stabilize disturbed areas on and around the 1‐10 ppm stockpile hydroseed was applied to
the Stink Cove Sediment placed over the stockpile cap material The stockpile of rocks from the
Former Mine Ops was also covered with soil and hydroseeded Erosion control blanket was also
used as required
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 20
9 Project Schedule
The project schedule showing the start and completion dates and the duration of work is
itemized below
Table 4 Timeline of On Site Activit ies
Activity Date(s)
Mobilization and Site Prep May 6 2013
Swale Construction at Tailings May 6 ndash May 20 2013
Excavation and TampD from Zones 3amp4 May 15 ndash August 27 2013
Excavation of 1‐10 ppm PCB Soils and Placement at May 16 ndash August 26 2013
the Tailings Impoundment Stockpile
Zone 3 Remediation Completion August 5 2013
Zone 4 Remediation Completion August 26 2013
Capping of 1‐10 ppm PCB Soil at Tailings August 7 ndash September 12 2013
Site Restoration August 7 ndash September 20 2013
Site Clean‐up and Demobilization September 23 ndash 26 2013
Table 5 PCB Disposal Trucking Dates
Activity Date(s)
Trucking of PCB Impacted Soil to Model City NY May 21 2013 ndash August 27 2013
Trucking of PCB Impacted Soil to Norridgewock ME May 15 2013 ndash August 22 2013
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488
OU1 ndash Interim Remediation Report Callahan Mine Superfund Site September 20 2013 Page 21
10 Summary
Charter Environmental Inc performed the following remediation and restoration services at the
Callahan Mine in Brooksville ME in accordance with Contract PIN No 1251208 between May 6
2013 and September 20 2013
Construction of drainage improvements within the Former Mine Operations area Tailings
Impoundment stockpile area and on select site access roads
Excavation and offsite disposal or on site relocation of PCB impacted soils from the Former
Mine Operations area
8429 tons of PCB impacted soil transported and disposed of offsite
1‐10ppm PCB impacted soil relocated on site
Excavated for constructed and capped cells of PCB impacted soils within the Ore stockpile
located at the Tailings Impoundment
Performed restoration work and drainage improvements at the Former Mine Operations
area and the Stockpile area at the Tailings Impoundment
Charter self‐performed PCB remediation drainage improvements and stockpiling and capping
activities at the Tailings Impoundment Work was completed in accordance with DEP contract
documents and the approved contractor Work Plan Work Plan Addendum Accident Prevention
Plan and Quality Assurance plan
When Charter de‐mobilized from the site during the week of September 23 2013 the following
steps were made to secure the site
Bought materials and other project associated items were relocated to the Battery Building
Site equipment trailer and conex boxes demobilized from the site
Gates were closed and locked
- barcode 547488
- barcodetext SDMS Doc ID 547488