Terminal 108W Bank Stabilization and Rehabilitation ...cleanupsites.org/t108/documents/2015/POS 2015...

Terminal108WBankStabilizationandRehabilitationDemonstrationProjectFinalAs‐BuiltandPerformanceReportInter‐AgencyAgreementNo.C1400216

PreparedbythePortofSeattle

FortheWashingtonStateDepartmentofEcology August10,2015

South Bank

North Bank

BankStabilizationAs‐BuiltandPerformanceReport Page2

1 Introduction ............................................................................................................................................. 3

1.1 Background ......................................................................................................................................... 3

1.2 Pre‐construction Site Conditions ........................................................................................................ 4

2 Bank Stabilization Activities ..................................................................................................................... 4

2.1 General Site and Erosion Control ....................................................................................................... 4

2.2 South Bank Regrading and Planting .................................................................................................... 5

2.3 North Bank Stabilization ..................................................................................................................... 7

2.4 Soil Stockpile Handling, Profile Sampling and Disposal ...................................................................... 8

2.5 Bank‐Soil Sampling and Analysis ......................................................................................................... 8

2.6 Construction Inspections and Reporting .......................................................................................... 10

3 Post Construction Monitoring and Reporting ........................................................................................ 10

3.1 Post Construction Evaluation ............................................................................................................ 10

3.2 Reports .............................................................................................................................................. 11

4 References .............................................................................................................................................. 11

Figures

Figure 1: Site Vicinity Map

Figure 2: Terminal 108 Site Map

Figure 3: Construction Site Plan and As‐Built Survey

Figure 4: As‐Built Cross Sections

Appendices

A Laboratory Analytical Results – OnSite Laboratory

B Waste Management Disposal Certificate and Bill of Lading

C Weekly Construction Reports

D Photos


1IntroductionOn April 9, 2014, the Port of Seattle (Port) and the State of Washington Department of Ecology (Ecology)

entered into Inter‐Agency Agreement (IAA) No. C1400216. In partial fulfillment of the requirements of

the IAA, the Port completed stabilization and rehabilitation of approximately 345 linear feet of eroding

shoreline at Terminal 108W (T‐108W) in June 2015. This report summarizes the Terminal 108W bank

stabilization and rehabilitation actions made possible by IAA No. C1400216.

Approximately 240 linear feet of bank at the project site was stabilized using alternative techniques,

including anchored, large woody debris and native riparian vegetation. Existing riprap slopes were

stabilized on an additional 105 feet of bank. The project is intended to provide proof‐of‐concept for

innovative stabilization techniques, combining effective control of chronic bank erosion with

rehabilitation of important riparian habitat. These methods may be appropriate for future, similar

marine industrial shoreline locations throughout the Lower Duwamish Waterway (LDW).

Following city, state, and federal authorizations, bank construction began in late February (mobilization

and site setup) and concluded the week of June 2 (demobilization and upland site sweeping). A follow‐

up inspection and evaluation of the bank was performed by Port staff four weeks after construction

completion, confirming that the stabilized bank areas were constructed and performing as intended.

1.1BackgroundThe LDW Superfund Site consists of five miles of the Duwamish Waterway measured from the southern

tip of Harbor Island to just south of the Norfolk Combined Sewer Overflow. The water area consists of

approximately 441 acres and discharges to Elliott Bay, Seattle, Washington. The LDW Superfund Site was

added to the EPA National Priorities List in September 2001 and to the Washington State Hazardous

Sites List on February 2002 due to human health and ecological risk levels that warrant action under

federal and state law. The Record of Decision (ROD, EPA 2014) for the cleanup of the in‐waterway

portion of the site (441 acres) was published in 2014.

As a component to the overall LDW cleanup, Ecology has implemented a source control strategy for the

32 square miles of combined sewer and stormwater drainage that serves the LDW Superfund site. The

goal of source control is to prevent recontamination of the LDW to levels that exceed the Washington

State Sediment Management Standards (Washington Administrative Code 173‐204) and the LDW

sediment cleanup goals (EPA, 2014). Bank erosion is an important contamination and recontamination

pathway, with the potential for release of previously placed fill materials that make up the LDW

shorelines.

Approximately 265 linear feet of unprotected bank at Terminal 108W on the east shore of the

Duwamish Waterway (approximately river mile 0.5) had visual indications of erosion, mainly due to

vessel‐generated wakes and currents in the Duwamish Waterway (Figure 1). Erosion disrupts shoreline

and aquatic areas, allows fill material and soils to enter the LDW, and reduces upland area available for

marine industrial use.


1.2Pre‐constructionSiteConditionsThe Port’s T‐108W is approximately 8 acres and includes unoccupied marine industrial upland area and

an adjacent Port of Seattle public shoreline access area (Figure 2). The shoreline at T‐108W is

approximately 1,200 feet (or 0.23 miles long). The marine industrial upland portion of the T‐108W site

includes concrete and asphalt pavement and compacted crushed rock surfaces. Shoreline conditions,

prior to bank rehabilitation, included failed riprap armoring and an unstable, eroding bank, with slope

angles ranging from vertical to 1:1 (horizontal:vertical). Shoreline vegetation between top‐of‐bank and

Mean Higher High Water (MHHW equivalent to +11.3 feet MLLW) consisted of invasive plants and

limited beach grass and emergent vegetation present below MHHW due to chronic erosion conditions.

The public access portion of the site is maintained with landscaping consisting of turf, native trees and

shrubs. An asphalt surface pathway extends to top‐of‐bank areas. As summarized in the Work Plan, five

past bank samples collected in 2012 (AECOM, 2014) showed concentrations of PCBs in one sample (16

mg/kg OC or 89 µg/kg dry weight) slightly above the carbon normalized benthic Sediment Cleanup

Objective (SCO) of 12 mg/kg OC. The OC normalized SCO is the same as the lowest LDW ROD Remedial

Action Levels (RAL) in intertidal areas. No other analyte exceeded the SCO or the RALs.

2BankStabilizationActivitiesThe bank stabilization activities were performed by the Port’s Port Construction Services (PCS) along

approximately 345 linear feet of bank. Construction oversight, documentation, sampling and reporting

was performed by Port staff. Other outside services included OnSite Laboratory for analytical services,

Waste Management Inc. for soil disposal and Earth Corps for planting. Site as‐builts and cross sections

are presented on Figures 3 and 4.

The eroding bank was stabilized using two techniques: (1) approximately 240 linear feet in the south

portion of the project area was regraded and rehabilitated using alternative engineering techniques

using wood instead of riprap and (2) stabilization of approximately 105 linear feet at the north margin of

the site was accomplished by reshaping and replenishing the riprap profile.

2.1GeneralSiteandErosionControlSite Boundary and Shoreline/Bank Elevation Limits and Markings. Consistent with federal, state, and

City permit authorizations, all work was conducted in bank areas landward of MHHW (+11.3 feet relative

to MLLW). A pre‐construction survey established and flagging marked the MHHW site contour. No soil

disturbing activities were performed below MHHW. In addition, the plus nine feet MLLW contour was

marked, in order to ensure appropriate separation between active work areas and tide levels. No

Ecology Construction General Stormwater permit was required since less than one acre of soil was

disturbed.

Exclusion Zone and Contamination Reduction Zone. PCS used the T‐108 Site‐Umbrella Health and

Safety Plan (Port, 2013) to prepare several task‐specific Job Hazard Analysis worksheets (concrete demo,

bank excavation, stockpiling, etc.). As part of site setup, an exclusion zone (EZ) was established around

the entire perimeter of the active work area. At the main ingress/egress of the EZ, PCS setup a

Contamination Reduction Zone consisting of a boot wash and wheel wash for equipment. Outside the EZ


were located PCS’s support trailer and vehicle parking areas. Throughout the project, PCS maintained

tight control of the work site and minimized dust and track‐out. Marine Maintenance swept the upland

site with a vac truck on a weekly basis or more throughout the duration of site activities.

Erosion Control: Prior to beginning any site work, the Port prepared a site erosion and sediment control

plan (POS, 2015a). Per the plan, all shoreline and bank construction activities were performed using

measures to avoid release of sediments to adjacent aquatic area. At the end of each

regrading/construction period, excavated and incomplete slopes were covered with fiber mats or plastic

sheeting and secured with sand bags. In addition, all incomplete toe‐of‐slope areas were protected with

12 inch diameter, ten feet long coir material “logs”, as a temporary erosion control measure.

Any potential adverse effects on water quality were minimized by the practices described above. At no

time during the work did Port personnel see turbid water conditions in the river. No water quality

monitoring was required since the work was done “in the dry”.

Spill Prevention: All operating equipment at the site was subject to best management practices (BMPs)

and Spill Prevention, Containment and Countermeasures (SPCC) implemented to avoid and minimize

potential releases of fuel and petroleum products used by construction equipment. These measures

included using diapers under all equipment engines and storing liquids and materials under cover (inside

the support trailer or container box).

2.2SouthBankRegradingandPlantingBank regrading: Approximately 240 feet of the south bank was regraded landward to establish a more

gradual, stable bank profile, variable in slope between 3:1 to 4:1 (horizontal to vertical). In general, bank

regrading moved the top‐of‐bank approximately six to ten feet landward.

PCS used a track‐mounted excavator to accomplish shoreline regrading, operating from the landward

margin of the project site. The bank work started by setting a row of large logs, as anchored large

woody debris along the +11.3 elevation, followed by regrading up‐slope.

Previously placed fill material and minor amounts of rubble and asphalt paving were removed from the

slope and temporarily stockpiled at the site.

A total of approximately 725 tons of soil was excavated and disposed of at the Columbia Ridge Landfill,

owned and operated by Waste Management. The graded soil consisted of gray to black medium sand,

likely historic dredge material from the river. No visual signs of staining or discoloration were observed

or any unusual odors. Prior to excavation, a soil sample of the planned new soil surface was collected

from test pits (Section 2.3). A summary of removed and imported materials is provided below (Table 1

and 2).


Table 1: Summary of total materials removed from site (includes all areas)

Material removed Amount Disposal Location

Vegetation 14 CY ECI

Concrete Debris 22 CY Renton Concrete Recyclers

Asphalt Debris 20 CY Cedar Mountain Reclamation (Merlino)

Construction Debris 9.22 tons Waste Management

Soil 751.76 tons Waste Management

Table 2: Summary of total materials imported to site (includes all areas)

Material Amount Source

Logs 53 large diameter logs Corps of Engineers

Quarry spalls/riprap 179.89 tons CalPortland

Compost/topsoil 200 CY Cedar Grove

Installation of large woody debris: Approximately 53 logs, installed as large woody debris, were provided

by United States Army Corps Engineers (USACE) from their navigation hazard removal program. A first

row of logs were placed at a new toe‐of‐slope at approximately +12 MLLW. These large logs are 20‐25

feet in length and minimum of 1.5 feet diameter held in place with steel chain attached to subgrade

"duck‐bill" anchors. A second large woody debris installation was placed along the shoreline at

approximately +13 feet MLLW and attached to the subgrade using the same anchors. The logs were

lifted over the bank and placed using hydraulic arm excavation equipment operating at the top‐of‐bank.

Logs were pressed into existing substrate, with approximately 70‐75 percent of the log cross‐section

above grade. Anchors were driven into the substrate approximately 20 feet below grade using the

hydraulic excavator and hand‐operated equipment. In all instances, the logs were overlapped at their

ends, with the outer end of the overlap between logs oriented downstream.

Installation of riparian vegetation: Approximately 200 cubic yards of imported topsoil was placed over the

re‐graded slope, approximately 1 to 1 ½ feet deep, and covered with a continuous layer of woven plant

material fabric or fiber matting.

Plant fiber matting was staked at the top of slope and held in place at the toe‐of‐slope by the installed

large, woody debris. During the week of May 18, native riparian vegetation was inserted through the

plant fiber matting as a continuous band of native trees and shrubs, between approximately +12 feet

MLLW to the top of the regraded bank, for a total of approximately 3,950 square feet coverage.

Plantings included approximately 63 native riparian trees: black cottonwood, red alder, Hooker and

Sitka willow, vine maple, shore pine, grand fir, Douglas fir, and Western red cedar. Native riparian

shrubs (approximately 215) consisted of tall Oregon grape, snowberry, ninebark, Nootka rose, red osier

dogwood, and red flowering currant. In addition, approximately 850 square feet was planted, between

the single and double large woody debris logs, with native beach grass and hair‐grass. Following

planting, approximately six to ten inches of chipped/shredded wood and clean‐green waste material

(arborist chips) was applied to the re‐shaped bank.


Ecology requested that the Port analyze a sample of placed material to verify topsoil quality was

acceptable for the site. A three point composite was collected of the top soil material on July 20, 2015.

The sample was submitted for laboratory analysis for arsenic, lead, copper, zinc, Semivolatile organics,

and PCBs per Ecology request. A summary of detected results is provided below (Table 3) with copies of

the laboratory reports presented in Appendix A.

Table 3: Topsoil Analytical Results

Analyte LDW RALs or AET (1)

TOPSOIL

Detected Metals in mg/kg

Arsenic 28 15 U

Copper 390 24

Lead 450 19

Zinc 410 100

Detected Semivolatiles in mg/kg

Phenol 0.420 0.39

Flouranthene 1.7 0.021

Pyrene 2.6 0.023

Total PCBs in µg/kg 130 7.3 U (1) Used the lowest RALs for intertidal areas listed on Table 28 of the ROD (EPA, 2014) or the

Marine Sediment AET Sediment Cleanup Objective (SQO) for organics.

(2) U – not detected at indicated reporting limit

2.3NorthBankStabilizationRiprap repair: Portions of the bank area on the north side of the existing pier (approximately 60 linear

feet) were also repaired, where previously placed riprap had slumped or was missing. In addition,

approximately 45 linear feet of riprap on the south side of the pier (e.g., dock bridge, see Figure 3) was

also placed for erosion control. Starting at approximately +12 feet MLLW, the slope was excavated

landward to a more stable 2:1 to 3:1 slope, and then stabilized with used and new riprap.

Approximately 50 linear feet of slope north of the existing pier had a riprap bank to about +15 feet

MLLW. Above this elevation, the existing bank was overgrown with shrubs and some riprap had

sloughed. This area was stripped of vegetation and graded to a nearly flat slope, then covered with new

riprap.

A total of approximately 25 tons of soil from the north bank regrading was excavated from both sides of

the pier and disposed of. The regraded and exposed soil consisted of brown and gray silty sand with

some gravel. The material appeared to be fill material. No visual signs of staining or discoloration were

observed or any unusual odors detected. Prior to placement of riprap, a soil sample of the graded soil

was collected (Section 2.3).


2.4SoilStockpileHandling,ProfileSamplingandDisposalIn anticipation of direct‐hauling bank soil (i.e., cut/grade bank soil and place directly into a haul truck),

the Port, with Ecology’s approval, chemically profiled soil along the south bank that was expected to be

handled and eventually disposed of off site. Three shallow test pits, ranging from 1 to 3 feet deep into

the side of the bank were excavated and a six‐point composite sample was collected and shipped to

OnSite Laboratory for analytical testing, including TPH‐G, TPH‐Dx, RCRA metals, PAHs, and PCBs per the

Ecology approved Work Plan. A summary of the sample results of the soil is provided below (Table 4)

with copies of the laboratory reports in Appendix A.

Table 4: Soil Stockpile Analytical Results

Analyte T108‐SP Result

TPH in mg/kg

Gasoline Range 7.1 U

Diesel Range 27 U

Lube Oil Range 54 U

Detected Metals in mg/kg

Barium 21

Chromium 11

Copper 10

Detected PAHs in mg/kg

Fluoranthene 0.0097

Pyrene 0.0091

Chrysene 0.008

Benzo[b]fluoranthene 0.044

Benzo[g,h,i]perylene 0.0083

Total cPAHs in µg TEQ/kg 1.18

Total PCBs in µg/kg 54 U

U – not detected at indicated reporting limit

Results of testing confirmed the soil was appropriate for Subtitle D disposal. Waste Management

accepted the profiled soil by issuing a Non‐Hazardous WAM Approval (Profile #110010WA, Appendix B)

on April 4, 2015 to PCS. A total of 751 tons of soil was hauled to Waste Management’s Alaska Street

transfer facility and ultimately disposed of at their Columbia Ridge landfill in Oregon (WM Bill of Lading,

Appendix B). Graded/generated soil was either loaded into a truck and hauled directly to the WM

facility or temporarily stockpiled on site. PCS constructed a temporary stockpile holding cell that was

lined with plastic and bermed with Ecology blocks. No stormwater runoff was observed or recorded in

weekly summaries, due to dry conditions. Soil stockpiles were also covered each night.

2.5Bank‐SoilSamplingandAnalysisThe chemical quality of the exposed bank soil was determined by sampling and analyzing the final

surface (top six inches) of the graded banks. Two locations – T108‐B1 and T108‐B2 – were generally co‐

located to previous bank soil sample locations BS‐1 and BS‐2 (AECOM 2012), except moved inland of

+11.3 feet MLLW. South bank samples T108‐B1 and T108‐B2 were collected prior to bank grading


activities by excavating a shallow test pit down to the anticipated elevation of the final bank slope.

North bank sample T108‐B3 was collected once the bank was graded and immediately prior to

placement of the riprap cover. As shown on Figure 2, north bank sample T108‐B3 was located

approximately 10 feet vertically east or upland of the 2012 BS‐3 sample. Former sample BS‐3 is located

in an area of shoreline bank that has not experienced erosion (e.g., the riprap cover remains in place and

structurally stable). Therefore sample T108‐B3 was located just up‐bank or land‐ward of former sample

BS‐3 and in an area that was graded and stabilized during this project.

Bank soil samples were analyzed by OnSite Environmental Laboratory for PCBs, percent total Organic

carbon, PAHs, and metals. The analytical results are summarized in Table 5 below. The table presents

the samples that are not OC normalized since less than 0.5% organic carbon was present in samples.

These results are compared to the LDW RALs or Ecology’s Lowest Apparent Effects Observed Levels

(LAETs) where there are OC normalized LDW RALs. Table 6 presents the sample that could be OC

normalized and is compared to the LDW Remedial Action Levels (RALs); full laboratory reports are

provided in Appendix A. This summary was revised to include an updated lower level detection limit for

PCBs, per Ecology request.

Table 5: Bank Soil Sample Analytical Results for T108‐B1 and T108‐B2 (dry weight only)

Analyte LDW RALs or LAET (2)

T108‐B1 T108‐B2

Northing (1) ‐ 208298.329 208409.345

Easting ‐ 1267355.25 1267319.697

Elevation in feet ‐ 11.3 11.3

Total Organic Carbon in % NA 0.042 U 0.042 U

Total Detected Metals in mg/kg

Arsenic 28 11 U 11 U

Chromium 260 7.8 10

Copper 390 8.1 8.1

Zinc 410 34 29

PAHs in µg/kg 230‐3200

7.2 U 7.2 U

Total PCBs in µg/kg

130 5.4 U 5.4 U

(1) Washington State Plane Coordinate System (2) Used the lowest RALs for intertidal areas listed on Table 28 of the ROD (EPA, 2014) or Marine

Sediment AET Sediment Cleanup Objective (SQO) for organics. U – not detected at indicated reporting limit

Table 6: Bank Soil Sample Analytical Results for T108‐B3 (organic normalized)

Analyte LDW RALs (2)

T108‐B3

Northing (1) ‐ 208495.44

Easting ‐ 1267304.86

Elevation ‐ 16.4

Total Organic Carbon in % NA 0.84


Arsenic 28 11 U

Chromium 260 26

Copper 390 29

Zinc 410 74

Detected PAHs in mg/kg OC

Naphthalene 99 1.67

2‐Methylnaphthalene NA 1.43

Phenanthrene 100 02.74

Anthracene 220 0.89

Fluoranthene 160 3.45

Pyrene 1000 3.57

Benzo[a]anthracene 110 2.74

Chrysene 110 3.45

Total Benzofluoranthenes 230 5.10

Benzo[a]pyrene 99 2.74

Benzo[g,h,i]perylene 31 2.26

Indeno(1,2,3‐c,d)pyrene 34 1.55

Total cPAHs in µg TEQ/kg 900 31.17

Total PCBs in mg/kg OC 12 5.1

(1)Washington State Plane Coordinate System (2) Used the lowest RALs for intertidal areas listed on Table 28 of the ROD (EPA, 2014). U – not detected at indicated reporting limit NA – not applicable

In general, the new bank soil samples were either ND or below the LDW RALs. In addition, the result of

this work stabilized the slope, so the direct bank‐soil erosion pathway is unlikely. Combined, this

indicates that remaining soils will not result in recontamination of the sediment remedy.

2.6ConstructionInspectionsandReportingConstruction inspections were made continuously during excavation to determine the presence of any

unanticipated contaminated soil based on visual and olfactory evidence. Both PCS personnel (daily) and

Port environmental staff (weekly) were inspecting regraded soil and reporting their findings (or lack of

findings) in weekly reports. During the work, Port staff also contacted Ecology on a regular basis to

provide construction updates and observations. Copies of all weekly construction reports are provided

as Appendix C and relevant project photos in Appendix D.

3PostConstructionMonitoringandReporting

3.1PostConstructionEvaluationThe physical condition of the regraded and stabilized slope (overall slope stability, log and soil

movement, new vegetation survival) was inspected approximately four weeks after completion of the

bank work. A second inspection will be performed approximately 6 months (October 2015) after

completion of the bank work; findings will be reported to Ecology in a letter report.


4‐Week Post Construction Inspection. A 4‐week follow up inspection was performed by Port staff.

During this inspection, the bottom area of the leading (i.e., lowest) log line and the areas of topsoil filling

and plantings were inspected . Finally, the 80‐foot long north bank area with new riprap was inspected.

During this inspection, no changes to the as‐built conditions were observed, including no erosion or

depositing near the logs. The new plantings were receiving daily watering from a temporary irrigation

system; they all appeared healthy except for less than 5% of the plantings that were either brown or

dead. Photos from the inspection are included in Appendix D.

6‐Month Post Construction Inspection. (See addendum due in October 2015).

3.2ReportsThis Performance Report is submitted as a requirement of the project work plan and contract. The

report includes a summary of field activities, validated sampling data, data review and analysis,

performance observations and photographs, final as‐built sections, and an evaluation of post

construction performance. Further, the analytical data generated as part of this work has been

submitted to Ecology’s Environmental Information Management (EIM) data base.

4References

AECOM, 2014. Terminal 108W, 108E, and 106W Source Control Data Evaluation Report.

EPA, 2014, Record of Decision Lower Duwamish Waterway Superfund Site

Port, 2013. Site Umbrella Health and Safety Plan (SUHASP), Terminal 108

Port, 2015. Terminal 108W Bank Stabilization and Rehabilitation Demonstration Final Work Plan.

Port, 2015a. Temporary Erosion and Sediment Control (TESC) Plan for T108 Bank Stabilization Project.

DRWN:EM/sea Revision: 0

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AppendixA

AnalyticalLaboratoryReport

OnSiteLaboratory

AppendixB

WasteManagement

DisposalCertificateandBillofLading

QUESTIONS? CALL 800 963 4776 FOR ASSISTANCELast Revised April 11, 2014 ©2014 Waste Management

Non-Hazardous WAM Approval

Requested Management Facility:

Profile Number: Waste Approval Expiration Date:

APPROVAL DETAILS

Approval Decision: Approved Not Approved Profile Renewal: Yes No

Management Method:

Generator Name:

Material Name:

Management Facility Precautions, Special Handling Procedures or Limitation on approval:

WM Authorization Name: Title:

WM Authorization Signature: Date:

Agency Authorization (if Required): Date:

Generator Conditions

- Shall not contain free liquids.

- Shipment must be scheduled into the disposal facility at least 24 hours in advance. Contact information will

be provided by your TSR.

- Waste manifest or applicable shipping document must accompany load.

- The waste profile number must appear on the shipping papers.

Please call to schedule at 206-763-5025

70 S. Alaskas Street, Seattle, Washington

Facility Conditions

- May pose a dust nuisance. Take precautions when unloading.

Bulk, ADC

Columbia Ridge Landfill

Port of Seattle - Terminal 108

PAH Contaminated Soil & Sediments

110010WA 04/07/2016

Alternate Daily Cover (ADC)

Kristin Castner Waste Approval Manager

04/07/2015

AppendixC

WeeklyConstructionReports

T-108 Shoreline Stabilization Mar. 5, 2015 PCS Weekly Progress Report Completed Work, Week Ending Mar. 4, 2015: • Con-ex trailer & equipment delivered/set-up onsite; • LWD logs transferred from T-25, stored on asphalt apron @ T-108; • Soil stockpile cells constructed; • Perimeter vegetation cleared & disposed (surface cut), existing fencing removed/disposed; • Met w/project team to discuss work plan, means & methods; • Crew de-mobilized pending permit;

Proposed Work, Week Ending Mar. 11, 2015 (All Work Pending Permit): • Mobilize crew; • Pothole several areas pre-construction for soil sampling; • Field test several types of anchors;

T-108 Shoreline Stabilization Mar. 12, 2015 PCS Weekly Progress Report Completed Work, Week Ending Mar. 11, 2015: • NTR, pending permit.

Proposed Work, Week Ending Mar. 18, 2015 (All Work Pending Permit): • Mobilize crew; • Pothole several areas pre-construction for soil sampling; • Field test several types of anchors;

T-108 Shoreline Stabilization Mar. 26, 2015 PCS Weekly Progress Report Completed Work, Week Ending Mar. 25, 2015: • NTR, pending permit.

Proposed Work, Week Ending Apr. 1, 2015: • Mobilize crew; • Demo Concrete Road @ northern bank area;

T-108 Shoreline Stabilization Apr. 2, 2015 PCS Weekly Progress Report Completed Work, Week Ending Apr. 1, 2015: • Received all regulatory permits and authorizations to proceed; PCS crew mobilized. • POS Survey onsite to establish MHHW points. • Demo concrete/asphalt apron to extent of new upper bank line. • Pot-hole for soil samples at various locations. Proposed Work, Week Ending Apr. 8, 2015: • Field test several types of drive-in anchors to be used on LWD; • Start bank excavation at Section 3, north of SW outfall; • Start placing LWD at lower elevations (MHHW).

T-108 Shoreline Stabilization Apr. 9, 2015 PCS Weekly Progress Report Completed Work, Week Ending Apr. 8, 2015: • Set LWD @ MLLW EL = 11.3 in Section 3, north of SW outfall; excavated/placed LWD @ MLLW = 12.0. • Started placing LWD @ MLLW EL = 11.3 in Section 4. • Received waste profile from WM, hauled off 140 tons soil. • Imported/stockpiled 40 CY fine compost from Cedar Grove. Proposed Work, Week Ending Apr. 15, 2015: • Finish placing LWD @ MLLW EL’s = 11.3 & 12.0 in Section 4 • Start 4:1 bank excavation at Section 3; anchor coir fabric.

T-108 Shoreline Stabilization Apr. 16, 2015 PCS Weekly Progress Report Completed Work, Week Ending Apr. 15, 2015: • Continued installation of large woody debris (LWD) @ MHHW & +12.0. • Started placing LWD & riprap to tie in slope @ north end of Section 4. • Continued hauling to WM, hauled off 100 tons soil, total of 240 tons to date. • Imported/stockpiled 40 CY fine compost from Cedar Grove. Proposed Work, Week Ending Apr. 22, 2015: • Continue placing LWD @ 11.3 & 12.0 to complete Section 4 • Start 4:1 bank excavation at Sections 3 & 4; anchor coir fabric.

T-108 Shoreline Stabilization Apr. 23, 2015 PCS Weekly Progress Report Completed Work, Week Ending Apr. 22, 2015: • Completed LWD & riprap placement @ north end of Section 4. • Completed bank work in Section 4, portion of Section 3. • Started installation of large woody debris (LWD) @ South end Section 1. • Hauled/disposed 170 tons soil to Waste Management, total of 410 tons to date. • Imported/stockpiled 80 CY fine compost & 20 CY topsoil from Cedar Grove. Proposed Work, Week Ending Apr. 29, 2015: • Continue placing LWD @ Sections 1 & 2. • Start bank excavation @ Section 1; anchor coir fabric.

T-108 Shoreline Stabilization Apr. 30, 2015 PCS Weekly Progress Report Completed Work, Week Ending Apr. 29, 2015: • Completed LWD placement @ all sections. • Start soil placement @ LWD between MHHW & 12.0. • Hauled/disposed 86 tons soil to Waste Management, total of 496 tons to date. • $91,510 total spent to date - 26% PCS budget vs 60% work complete (total spent does NOT include cost of wages,

OH, material, & equipment incurred after 4/15/15). Proposed Work, Week Ending May 6, 2015: • Continue/complete placing soil @ LWD. • Start bank excavation @ Section 1; anchor coir fabric.

T-108 Shoreline Stabilization May 7, 2015 PCS Weekly Progress Report Completed Work, Week Ending May. 6, 2015: • Anchored LWD @ all sections. • Completed soil placement @ LWD between MHHW & 12.0. • Hauled/disposed 110 tons soil to Waste Management, total of 606 tons to date. • $102,830 total spent to date - 30% PCS budget vs 75% work complete (total spent does NOT include salary & wages,

OH, material, equipment, disposal costs incurred after 4/18/15). Proposed Work, Week Ending May 13, 2015: • Complete bank grading, coir fabric installation south of pier. • Start bank excavation @ Section 5 north of pier.

T-108 Shoreline Stabilization May 13, 2015 PCS Weekly Progress Report Completed Work, Week Ending May. 13, 2015: • Completed bank grading (and coir cover), LWD placement from so. end to pier walkway. • Placed/secured logs @ top of bank perimeter. • Hauled/disposed 180 tons soil to Waste Management, total of 786 tons to date. • $103,345 total spent to date - (total spent does NOT include salary & wages, OH, material, equipment, disposal costs

incurred after 4/18/15). Proposed Work, Week Ending May 20, 2015: • Complete bank grading, rock installation north of pier. • Finish soil haul/disposal. • Topo survey bank north of pier.

T-108 Shoreline Stabilization May 28, 2015 PCS Weekly Progress Report Completed Work, Week Ending May. 27, 2015: • Completed bank grading rip rap placement north of pier walkway. • Completed planting & mulch (Earth Corp). • Site clean-up & de-mobilization – project complete. • $126,470 total spent to date - (includes salary & wages, OH, material, equipment, disposal costs paid through

5/20/15). No Proposed Work, Week Ending May 20, 2015:

AppendixD

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