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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.

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former dupont barksdale works project update

Former DuPont Barksdale Works Project Update

June 06, 2006

Great Lakes Visitors Center

DuPont CRG

dupont company representatives
DuPont Company Representatives
  • Brad Nave: Project Director – DuPont Corporate Remediation Group
  • Cary Pooler: Project Manager – URS Corporation

Former DuPont Barksdale Works

purpose of meeting
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.

Former DuPont Barksdale Works

project priorities
Project Priorities

Four Project Priorities:

  • Continue to provide drinking water that meets appropriate Wisconsin regulatory standards for all site-related compounds to residents with impacted wells.
  • Develop plan for long-term drinking water supply and implement as appropriate.
  • Evaluate for potential off-site surface water issues and take appropriate action.
  • Identify priority source areas and take appropriate action.

Former DuPont Barksdale Works

project priorities1
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.

Former DuPont Barksdale Works

other commitments
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.

Former DuPont Barksdale Works

work completed in 2006
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.

Former DuPont Barksdale Works

site investigation work planned for 2006
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

Former DuPont Barksdale Works

northern area investigation issues identified
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.

Former DuPont Barksdale Works

northern area investigation issues identified1
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.

Former DuPont Barksdale Works

perchlorate overview
PerchlorateOverview
  • Perchlorate is both a naturally occurring and manmade anion consisting of chlorine bonded to four oxygen atoms (ClO4-).

Former DuPont Barksdale Works

perchlorate overview1
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.

Former DuPont Barksdale Works

perchlorate overview2
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.

Former DuPont Barksdale Works

perchlorate overview3
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.

Former DuPont Barksdale Works

perchlorate overview4
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.

Former DuPont Barksdale Works

northern area investigation work completed to date
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.

Former DuPont Barksdale Works

northern area investigation work completed to date1
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.

Former DuPont Barksdale Works

northern area investigation work completed to date2
Northern Area InvestigationWork Completed to Date
  • Phase I excavation (at Finishing Plant)

Former DuPont Barksdale Works

northern area investigation work completed to date3
Northern Area InvestigationWork Completed to Date
  • Phase II excavation (at Refine ditch)

Former DuPont Barksdale Works

northern area investigation work completed to date4
Northern Area InvestigationWork Completed to Date

TNT Layer

  • More excavation photos showing TNT.

Former DuPont Barksdale Works

northern area investigation work completed to date5
Northern Area InvestigationWork Completed to Date
  • More excavation photos showing TNT.

Former DuPont Barksdale Works

northern area investigation work completed to date6
Northern Area InvestigationWork Completed to Date
  • More excavation photos showing TNT.

Former DuPont Barksdale Works

tnt removal process
TNT Removal Process
  • Collect & size pieces by hand
  • Weigh, wet, and pack in antistatic bags
  • Courier ship bags to St.Louis for incineration

Former DuPont Barksdale Works

northern area investigation pictures of waste areas
Northern Area InvestigationPictures of Waste Areas

West Boyd Rail Fill

Former DuPont Barksdale Works

northern area investigation pictures of waste areas1
Northern Area InvestigationPictures of Waste Areas

West Boyd Rail Fill

Slab Crossing Debris

Former DuPont Barksdale Works

northern area investigation pictures of waste areas2
Northern Area InvestigationPictures of Waste Areas

West Boyd Rail Fill

Nitramon Area Container Dump

Former DuPont Barksdale Works

northern area investigation pictures of waste areas3
Northern Area InvestigationPictures of Waste Areas

Crushed Drum Dump

Former DuPont Barksdale Works

northern area investigation work completed to date8
Northern Area InvestigationWork Completed to Date
  • Typical surficial debris recovered.

Former DuPont Barksdale Works

northern area investigation work completed to date9
Northern Area InvestigationWork Completed to Date
  • Bare area photos.

Bare Area

Former DuPont Barksdale Works

northern area investigation path forward
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

Former DuPont Barksdale Works

site related research work
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.

Former DuPont Barksdale Works

proposed barksdale soil biodegradation pilot

Methanol

(wood alcohol)

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 Reactor

Site Soils

Contaminated w/ DNT

(source of bacteria and DNT)

Denitrification Reactor

to Remove Nitrite

(bacteria from soils)

N2 + CO2 + H2O

2 NO2-

1 DNT

Gravel for Drainage

Methanol +

NO2-

Former DuPont Barksdale Works

southern area investigation scope of work
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.

Former DuPont Barksdale Works

southern area investigation scope
Southern Area Investigation Scope

Former DuPont Barksdale Works

southern area investigation preliminary findings
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.)

Former DuPont Barksdale Works

southern area investigation preliminary findings1
Southern Area InvestigationPreliminary Findings
  • 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.

Former DuPont Barksdale Works

southern area investigation preliminary findings2
Southern Area InvestigationPreliminary Findings
  • 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.

Former DuPont Barksdale Works

southern area investigation grid sizes
Southern Area InvestigationGrid Sizes

Former DuPont Barksdale Works

northern area investigation issues identified2
Northern Area InvestigationIssues Identified
  • Insert maps/pictures of issues/findings.

Former DuPont Barksdale Works

southern area investigation 1970s berm
Southern Area Investigation1970s Berm

Former DuPont Barksdale Works

southern area investigation 1970s berm1
Southern Area Investigation1970s Berm

1970s Berm

Former DuPont Barksdale Works

southern area investigation suggested path forward
Southern Area InvestigationSuggested Path Forward
  • Conduct additional sampling (Spring, 2006) for the purposes of delineating specific areas along historic roadways and railways.

Former DuPont Barksdale Works

summary of presentation
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.

Former DuPont Barksdale Works

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Questions or comments?

Former DuPont Barksdale Works