Former DuPont Barksdale Works Project Update December 14, 2006 Great Lakes Visitors Center DuPont...
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Transcript of Former DuPont Barksdale Works Project Update December 14, 2006 Great Lakes Visitors Center DuPont...
Former DuPont Barksdale Works Project Update
December 14, 2006
Great Lakes Visitors Center
DuPont CRG
December 14, 2006 Former DuPont Barksdale Works 2
DuPont Company Representatives
Brad Nave – Project Director, DuPont Corporate Remediation Group
Jon Hammerberg – Senior Project Engineer, URS Corporation
December 14, 2006 Former DuPont Barksdale Works 3
Purpose of Meeting
Provide an update on site priorities and public commitments
Provide an update on work completed in 2006 and preliminary results
Discuss next steps
Barksdale Project Priorities and Commitments ReviewBrad Nave
December 14, 2006 Former DuPont Barksdale Works 5
Project Priorities
Four Project Priorities:
1. Continue to provide drinking water that meets appropriate Wisconsin regulatory standards for all site-related compounds to residents with impacted wells
2. Develop plan for long-term drinking water supply and implement as appropriate
3. Evaluate for potential off-site surface water issues and take appropriate action
4. Identify priority source areas and take appropriate action
December 14, 2006 Former DuPont Barksdale Works 6
Project Priorities
Other Commitments:
– Continue to work with WDNR in the investigation/cleanup of site impacts
– Continue to be available and communicate with neighbors
– Fulfill commitments on Home Value Protection Plan
December 14, 2006 Former DuPont Barksdale Works 7
Alternative Water Supply
Alternative Water Supply
– To date, DuPont has been billed $115.6M and paid over $114.3M in related water supply costs to Washburn
Managing invoices, supply, and maintenance with Washburn
December 14, 2006 Former DuPont Barksdale Works 8
Home Value Protection Plan
Home Value Protection Program has expired.
– DuPont fulfilled all commitments and obligations
Last property (vacant lot) sold on June 23, 2006
2006 Site InvestigationJon Hammerberg
December 14, 2006 Former DuPont Barksdale Works 10
2006 Site Investigations
Purpose of investigations:
– Evaluate suitability of selected site areas for recreational use
– Continue characterizing former production areas
– Prioritize areas for future activities
December 14, 2006 Former DuPont Barksdale Works 11
2006 Site Investigations
800 samples from 4 geographic focus areas
– Northern Production Area: (274 acres) site of former manufacturing and support operations
– Northern Grid Area: (305 acres) lightly or undeveloped grounds inside the plant fence
– Southern Area: (443 acres) product storage and undeveloped grounds inside the plant fence
– Off Site Areas: (117 acres) residential and undeveloped grounds outside the plant fence
December 14, 2006 Former DuPont Barksdale Works 12
2006 Site Investigation Map
December 14, 2006 Former DuPont Barksdale Works 13
Northern Area Investigation
Continued site characterization via
– Trenching in former production areas– Discrete soil sampling at biased locations– Grid sampling generally in undeveloped areas– Geophysical survey of waste sites– Clearing (4.3 miles of new roads, 17 miles cleared)– Installation of 6 wells and interior groundwater sampling– Surface water and sediment sampling
Recovered and disposed TNT during investigation
– ~2,000 pounds of TNT recovered to date– ~500 pounds recovered in 2006
Evaluated perchlorate distribution in groundwater and soils
December 14, 2006 Former DuPont Barksdale Works 14
Insert.
Northern Area Investigation Maps
December 14, 2006 Former DuPont Barksdale Works 15
Southern Area Investigation
Continued site characterization
– Supplemental sampling in areas where elevated concentrations of inorganic constituents were detected in 2005
Discrete soil sampling at biased locations
Grid sampling
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Insert.
Southern Area Investigation Map
December 14, 2006 Former DuPont Barksdale Works 17
2006 Investigations Findings
Findings in undeveloped areas:
– Large portions of the northern and southern undeveloped areas are acceptable for current recreational use
Approximately 438 of the 443 acres in the southern area are below site-specific recreational screening levels
Grid locations that exceed site-specific screening levels are principally confined to roadways and railroad beds
Arsenic responsible for most of the risk in the south Area-wide cumulative risks within frequently used southern
transportation corridors are in acceptable range for current use Explosive compounds do not significantly contribute to overall
risk in the southern area Approximately 300 of the 305 acres within the northern gridded
area appear to be acceptable for the current recreational use based on preliminary data evaluation
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Insert map
2006 S Risk & Corridor
December 14, 2006 Former DuPont Barksdale Works 19
Insert maps/pictures of issues/findings.
Draft Northern Area Undeveloped Area
Investigation Results
1. Does not include biased samples
2. Results compared to site-specific recreational RCLS
December 14, 2006 Former DuPont Barksdale Works 20
2006 Investigations Findings
Findings in production or waste areas– 18 of 21 areas on site have been investigated; the 3 yet to be
evaluated potentially contain nitroglycerin and require different sampling procedures.
– Products visible at the surface in 2/3rds of the areas evaluated and in the subsurface (> 2ft bgs) in half of the areas evaluated
– Products are generally encountered along former process buildings and ditches; some located beneath building slabs
– Product found in five buried waste and debris deposits (0.5 to four acres in size) located across the site
– Potential asbestos containing material visible in 5 of the 18 areas evaluated
December 14, 2006 Former DuPont Barksdale Works 21
Perchlorate
Concentrations in groundwater onsite range between non-detect (at 0.01) to 1,200 parts per billion
The majority of the boundary groundwater results were less than 1 ppb
– Three exceptions are observed downgradient of former burning ground south of Barksdale Village and north of Boyd’s Creek. East of HWY 13 perchlorate was detected at 250 ppb in groundwater
Perchlorate was not detected in the two potable wells sampled on-site
Concentrations in soil (ranged from non-detect to 2.2 mg/Kg) are below the residential screening value (55 mg/Kg)
December 14, 2006 Former DuPont Barksdale Works 22
Insert maps/pictures of issues/findings.
Path ForwardBrad Nave
December 14, 2006 Former DuPont Barksdale Works 24
Near Term Path Forward
Complete Current Conditions Report Continue investigation
– Production areas Follow-up in previously investigated areas Characterization of areas previously not investigated
– Three dynamite/ nitroglycerine areas Continue to understand NX distribution and contribution
to risk – Northern Undeveloped Areas
Continued investigation and risk screening as determined by output of 2006 data evaluation
Meet commitments regarding municipal water supply Research at GA Tech and on-site Share results with WDNR and community members
Chequamegon-Nicolet National Forest UpdateBrad Nave
December 14, 2006 Former DuPont Barksdale Works 26
2006 Chequamegon National Forest Work National Forest Service contacted DuPont in April
2006 regarding two reported former detonation cladding sites
DuPont and the Forest Service developed a framework for future actions and the technical approach for a geophysical investigation at both sites
Field work begun in October to delineate the extent of metallic debris at the Clover and Cabin Lake sites
Delineation of debris completed at the Cabin Lake site
Debris delineation partially complete at the Clover site, work will resume in 2007 when weather allows
December 14, 2006 Former DuPont Barksdale Works 27
December 14, 2006 Former DuPont Barksdale Works 28
2006 Cabin Lake Work
Insert mapCABINLAKE
December 14, 2006 Former DuPont Barksdale Works 29
2006 Clover Results
Insert map
•OPERATORSSTATION
NorthPad
SouthPad
December 14, 2006 Former DuPont Barksdale Works 30
2007 Chequamegon National Forest Work
Continue delineating metal at the Clover site
Report 2006 findings for both sites
Work with the Forest Service to develop and execute a soil sampling program at both sites
December 14, 2006 Former DuPont Barksdale Works 31
Questions or comments?