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Former DuPont Barksdale Works Project Update. June 06, 2006 Great Lakes Visitors Center DuPont CRG. DuPont Company Representatives. Brad Nave: Project Director – DuPont Corporate Remediation Group Cary Pooler: Project Manager – URS Corporation. Purpose of Meeting. - PowerPoint PPT Presentation
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Former DuPont Barksdale Works Project Update
June 06, 2006Great Lakes Visitors Center
DuPont CRG
June 6, 2005 Former DuPont Barksdale Works 2
DuPont Company Representatives
Brad Nave: Project Director – DuPont Corporate Remediation Group
Cary Pooler: Project Manager – URS Corporation
June 6, 2005 Former DuPont Barksdale Works 3
Purpose of Meeting
Reaffirm site priorities and public commitments.
Provide an update on work completed since the December 2005 public meeting.
Provide an overview for planned work for 2006.
Project Priorities and Commitments ReviewBrad Nave
June 6, 2005 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.
June 6, 2005 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.
June 6, 2005 Former DuPont Barksdale Works 7
Other Commitments
Home Value Protection Plan – Home Value Protection Program has expired.
Last municipal water connection was in June 2005.
Availability of the program was the last calendar day of August 2005 for most residents.
A single vacant lot is the only residential property currently in the program and is for sale.
June 6, 2005 Former DuPont Barksdale Works 8
Work Completed in 2006
Alternative Water Supply– Managing invoices with Washburn– Well abandonment documentation sent to
homeowners and WDNR Georgia Tech Bio-Pilot
– Insert bullet updates Site Investigation Work
– 2006 Work plan submitted to WDNR in March. Preliminary approval has been received from WDNR.
Planned 2006 Site InvestigationCary Pooler
June 6, 2005 Former DuPont Barksdale Works 10
Site InvestigationWork Planned for 2006
Work planned for 2006:– Historical building/process review– Groundwater investigation– Waste area identification– Debris location/recovery– Discrete soil sampling– Excavation of soil adjacent to select former
process and support buildings and select process ditches
June 6, 2005 Former DuPont Barksdale Works 11
Northern Area InvestigationIssues Identified
Learnings to date include:– Two separate plumes of site-related constituents
in groundwater.– Over 280 historical buildings across site.– 13 waste management areas identified to date.
Two former burning grounds. Remaining areas include empty containers,
building rubble and other debris.– TNT present at surface and at depth at select
building foundations and ditches.
June 6, 2005 Former DuPont Barksdale Works 12
Northern Area InvestigationIssues Identified
Learnings to date (continued):– Percentage level concentrations of DNT isomers
at select locations across the site.– Bare areas distributed across former
manufacturing areas.– Bare areas in former acid production areas.– Potential asbestos containing material (PACM).– Debris includes empty drums, process vessels,
and a variety of other metallic and non-metallic wastes.
– Perchlorate preliminarily identified in groundwater.
June 6, 2005 Former DuPont Barksdale Works 13
PerchlorateOverview
Perchlorate is both a naturally occurring and manmade anion consisting of chlorine bonded to four oxygen atoms (ClO4
-).
June 6, 2005 Former DuPont Barksdale Works 14
PerchlorateOverview
Why are we looking for perchlorate at Barksdale?– A historical document identified in February of
2005 indicated that the former Barksdale plant manager was corresponding with a chemist in Chile about staffing.
– This letter may indicate a that sodium nitrate from Chile was used for as a raw material for nitric acid production at Barksdale.
June 6, 2005 Former DuPont Barksdale Works 15
PerchlorateOverview
At this time, most naturally occurring sources of perchlorate appear to be geographically limited to arid environments. High natural perchlorate concentrations are found in Chilean caliche and some potash ores.– Sodium nitrate is leached from Chilean caliche to
make fertilizers, among other products. Chilean nitrate derived fertilizers were the
primary fertilizers used in the United States until the 1960s.
– Sodium nitrate (“soda nitre” or “Chilean saltpeter”) was formerly an important raw material for the production of nitric acid in the United States and elsewhere.
June 6, 2005 Former DuPont Barksdale Works 16
PerchlorateOverview
Preliminary results:– Preliminary laboratory results indicate that
concentrations in groundwater surrounding the former nitric acid production area range between 0.033 to 150 parts per billion (ppb).
– Perchlorate was not detected in the two potable wells sampled on-site.
June 6, 2005 Former DuPont Barksdale Works 17
PerchlorateOverview
EPA has established a 24.5 ppb limit in drinking water for perchlorate.– Perchlorate inhibits iodide uptake.
Next steps:– Sample additional wells on-site in Spring 2006.
June 6, 2005 Former DuPont Barksdale Works 18
Northern Area InvestigationHistorical Buildings/Ditches
June 6, 2005 Former DuPont Barksdale Works 19
Northern Area InvestigationWork Completed to Date
Trenching Investigation– Investigation of subsurface residual product
distribution and identification of former subsurface pit and drain locations.
– Phase I – Identify typical conditions Used remote controlled excavator Focus on soil adjacent to former process
buildings.
June 6, 2005 Former DuPont Barksdale Works 20
Northern Area InvestigationWork Completed to Date
Trenching Investigation(continued):– Phase II –
Used shielded conventional excavator. Focus on process ditches & buildings similar to
those from Phase I. Used bulk (mechanized) excavation to
determine location and expose deposits Used forensic (hand dug) excavation to
determine detail of deposition of solid deposits.
June 6, 2005 Former DuPont Barksdale Works 21
Northern Area InvestigationWork Completed to Date
Phase I excavation (at Finishing Plant)
June 6, 2005 Former DuPont Barksdale Works 22
Northern Area InvestigationWork Completed to Date
Phase II excavation (at Refine ditch)
June 6, 2005 Former DuPont Barksdale Works 23
Northern Area InvestigationHistorical Buildings/Ditches
TNT
June 6, 2005 Former DuPont Barksdale Works 24
Northern Area InvestigationWork Completed to Date
More excavation photos showing TNT.TNT Layer
June 6, 2005 Former DuPont Barksdale Works 25
Northern Area InvestigationWork Completed to Date
More excavation photos showing TNT.
June 6, 2005 Former DuPont Barksdale Works 26
Northern Area InvestigationWork Completed to Date
More excavation photos showing TNT.
June 6, 2005 Former DuPont Barksdale Works 27
TNT Removal Process
Collect & size pieces by hand Weigh, wet, and pack in antistatic bags Courier ship bags to St.Louis for incineration
June 6, 2005 Former DuPont Barksdale Works 28
Northern Area InvestigationWork Completed to Date
June 6, 2005 Former DuPont Barksdale Works 29
Northern Area InvestigationPictures of Waste AreasWest Boyd Rail Fill
June 6, 2005 Former DuPont Barksdale Works 30
Northern Area InvestigationPictures of Waste AreasWest Boyd Rail Fill
Slab Crossing Debris
June 6, 2005 Former DuPont Barksdale Works 31
Northern Area InvestigationPictures of Waste AreasWest Boyd Rail Fill
Nitramon Area Container
Dump
June 6, 2005 Former DuPont Barksdale Works 32
Northern Area InvestigationPictures of Waste AreasCrushed Drum Dump
June 6, 2005 Former DuPont Barksdale Works 33
Northern Area InvestigationWork Completed to Date
Typical surficial debris recovered.
June 6, 2005 Former DuPont Barksdale Works 34
Northern Area InvestigationWork Completed to Date
Bare area photos.
Bare Area
June 6, 2005 Former DuPont Barksdale Works 35
Northern Area InvestigationPath Forward
Continue to determine distribution of site-related constituents.
– Four month field effort planned for 2006.– Explore feasibility of alternative investigation techniques.
Continue TNT recovery and disposal as part investigation efforts.
Continue debris identification and recovery. Continue to understand perchlorate distribution in
groundwater. Consider grid sampling in select areas. Continue pilot test work at GA Tech
June 6, 2005 Former DuPont Barksdale Works 36
Site-related Research Work
Continuing Georgia Institute of Technology research on destruction of DNT and TNT.
– Study being conducted by Dr. Joe Hughes (Professor and Chair of the Civil Engineering Dept. at Ga. Tech) and Dr. Jim Spain.
– Study initiated in early 2004 and is ongoing.– A portion of their research on TNT destruction was published in the
peer reviewed journal Environmental Science and Technology this year.
– Scaled-up DNT bioremediation project to address DNT contaminated soils is in progress at the Georgia Tech facility.
Soils used in the system are from the Barksdale site. System will run until all DNT degraded or other suitable
endpoint is reached Final results should be available by the end of 2006. Updates will be provided in future public meetings.
June 6, 2005 Former DuPont Barksdale Works 37
Proposed Barksdale Soil Biodegradation Pilot Proposed pilot project is a simple set up with low operation and
maintenance requirements.
Water, pH adjustment &
Nutrients (phosphate,
magnesium, calcium, iron)
DNT Biodegradation ReactorSite Soils
Contaminated w/ DNT (source of bacteria and DNT)
Gravel for Drainage
1 DNT 2 NO2
-
Methanol +NO2
-
N2 + CO2 + H2O
Methanol (wood alcohol)
Denitrification Reactor to Remove Nitrite
(bacteria from soils)
June 6, 2005 Former DuPont Barksdale Works 38
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June 6, 2005 Former DuPont Barksdale Works 44
Southern Area InvestigationScope of Work
Worked with WDNR to develop a work plan to investigate southern area.– Focus of work was to:
Determine nature and extent of site-related constituents in surface soil.
Determine if current recreational use is appropriate.
– Work plan approved by WDNR. Site sampling was very comprehensive,
encompassing both grid-based and biased sampling at 640 locations (416 analyzed) over 400+ acres.
June 6, 2005 Former DuPont Barksdale Works 45
Southern Area Investigation Scope
June 6, 2005 Former DuPont Barksdale Works 46
Southern Area InvestigationPreliminary Findings
With the exception of one occurrence of benzo(a)pyrene at the residential screening level, arsenic and lead are the only constituents that exceed residential or recreational screening levels.
The extent of contamination is generally limited to soils along historic roadways in the central portion of the parcel. (The one exception being at select samples in the northeastern corner of the parcel.)
June 6, 2005 Former DuPont Barksdale Works 47
The nature and distribution of contamination is consistent with our understanding of historic site operations and our experience at other munitions manufacturing sites.
Arsenic and lead concentrations are well correlated, especially in samples that exceed their respective screening criteria. Hence, selected remediation of elevated levels of one constituent would also address the other.
Southern Area InvestigationPreliminary Findings
June 6, 2005 Former DuPont Barksdale Works 48
The levels of lead and arsenic observed do not represent an acute health risk, and as such, use of this area for an additional season of occasional recreational activities would not be expected to result in unacceptable exposures.
A waste disposal area (1970s berm) was identified. Waste materials primarily consist of building rubble.
Southern Area InvestigationPreliminary Findings
June 6, 2005 Former DuPont Barksdale Works 49
Southern Area InvestigationGrid Sizes
June 6, 2005 Former DuPont Barksdale Works 50
Northern Area InvestigationIssues Identified
Insert maps/pictures of issues/findings.
June 6, 2005 Former DuPont Barksdale Works 51
Southern Area InvestigationIssues Identified
June 6, 2005 Former DuPont Barksdale Works 52
Southern Area Investigation1970s Berm
June 6, 2005 Former DuPont Barksdale Works 53
Southern Area Investigation1970s Berm
1970s Berm
June 6, 2005 Former DuPont Barksdale Works 54
Southern Area InvestigationSuggested Path Forward
Conduct additional sampling (Spring, 2006) for the purposes of delineating specific areas along historic roadways and railways.
June 6, 2005 Former DuPont Barksdale Works 55
Summary of Presentation
Priorities remain unchanged. Progress made in northern and southern
sections of property in 2005.– Over 400 pounds of TNT recovered and destroyed
in northern section in 2005, and several former process areas were investigated. Four months of field work are planned in 2006.
– Groundwater investigation resulted in detections of perchlorate. Additional samples to follow 2Q06.
– 640 locations sampled in southern section of the site (over 400 acres). Additional investigation of several areas is planned for 2006.
June 6, 2005 Former DuPont Barksdale Works 56
Questions or comments?
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