Transcript Barksdale Alternative Water Supply Project Proposal

Former DuPont Barksdale Works
Project Update
August 16, 2006
Great Lakes Visitors Center
DuPont CRG
DuPont Company Representatives
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Brad Nave: Project Director – DuPont
Corporate Remediation Group
Jon Hammerberg: Project Engineer – URS
Corporation
Cary Pooler: Project Manager – URS
Corporation
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Purpose of Meeting
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Barksdale:
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Reaffirm site priorities and public commitments.
Provide an update on work completed since the
June 2006 public meeting.
Chequamegon-Nicolet National Forest:
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Provide a status update on activities.
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Barksdale Project Priorities and
Commitments Review
Brad Nave
Project Priorities
Four Project Priorities:
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4.
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.
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Project Priorities
Other Commitments:
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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.
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Alternative Water Supply
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Alternative Water Supply
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Managing invoices, supply, and maintenance
with Washburn.
To date, DuPont has paid $110,183.95 in related
water supply costs to Washburn.
DuPont is committed to honoring the agreement
with Washburn.
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Home Value Protection Plan
Home Value Protection Program has expired.
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August 16, 2006
Program now expired.
Last property (vacant lot) sold on June 23, 2006.
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Work Completed in 2006
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Georgia Tech Bio-Pilot
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DNT soil pilot test at Georgia Tech was
successful.
System was operated for 5 months and a 90%
reduction was observed.
Soil from system taken back to lab to further
determine limits of degradation.
Site visit with Georgia Tech researchers
planned for August 17th.
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August 16, 2006
Will serve as groundwork for bench scale, lab
pilot scale, and field pilot scale work starting in
2007.
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2006 Site Investigation
Jon Hammerberg
2006 Site Investigation
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2006 Site Investigation
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Two geographic focus areas:
 Northern Area
– Investigation multi-faceted.
 Southern Area
– Investigation focusing on surface soils.
Investigation begun in June.
Estimated completion of field work is September
2006.
Reporting by the end of the year.
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Northern Area Investigation
Work Being Performed
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Determine distribution of site-related
constituents.
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Trenching.
Grid sampling in select areas.
TNT recovery and disposal as part
investigation efforts.
Debris identification and recovery.
Perchlorate distribution in groundwater.
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Site Investigation
Work Completed to Date
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Investigation conducted in 2006 includes:
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Geophysical survey of waste sites
Clearing of trees and brush
Groundwater sampling for perchlorate at perimeter
Trenching of production buildings
Hand sampling of soil
Geoprobe sampling of soil
Sizing of TNT
Work remaining includes:
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Well installation and interior groundwater sampling
Additional GeoProbe sampling
Surface water and sediment sampling
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Perchlorate
Overview
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Why are we looking for perchlorate at
Barksdale?
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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.
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Perchlorate
Overview
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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.
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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.
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Perchlorate
Overview
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Preliminary results:
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Preliminary laboratory results indicate that
concentrations in groundwater surrounding the
former nitric acid production area range between
non-detect (at 0.01) to 150 parts per billion (ppb).
Perchlorate was not detected in the two potable
wells sampled on-site.
EPA has established a 24.5 ppb limit in
drinking water for perchlorate.
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Perchlorate inhibits iodide uptake.
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Perchlorate Investigation
Work Completed to Date
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Areas where historic information indicates
past use of soda nitre imported from Chile
include:
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Soda Nitre handling buildings (Soda Store
Houses, Drying Houses and Elevators - 2 each)
Nitric Acid Plants prior to 1928 (Nitric Acid Houses
1 each year from 1908, 1913, 1917 and 1918)
Waste soda disposal areas (Nitre Cake Ditches
(2), Salt Cake Pond, and Plant Burning Ground)
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Perchlorate Investigation
Sites Sampled in 2006
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Site Investigation
Work Completed to Date
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Excavation of TNT production building
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Site Investigation
Work Completed to Date
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Geoprobe sampling of soil
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Site Investigation
Work Completed to Date
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Hand sampling of soil
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Site Investigation
Work Completed to Date
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Clearing of trees & brush
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Site Investigation
Work Completed to Date
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Geophysical survey of waste sites
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Site Investigation
Work Completed to Date
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Recovered TNT sizing
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Perchlorate Investigation
Work Completed to Date
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Excavation of Nitre Cake Ditch and Salt Cake flume at Nitric
Plant #1
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Perchlorate Investigation
Work Completed to Date
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Excavation of brick lined Nitre Cake Ditch at Nitric Plant #2
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TNT Investigation
Work Completed to Date
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Trenching Investigation
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Used shielded conventional excavator.
 Focused 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.
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TNT Investigation
2006 Trenching Sites
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TNT Investigation
Work Completed to Date
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TNT7 Graining House - mowed
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TNT Investigation
Work Completed to Date
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TNT7 Graining House - cleared
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TNT Investigation
Work Completed to Date
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Solidified TNT found in footings of TNT7 Graining
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TNT Investigation
Work Completed to Date
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TNT7 Graining House - investigated
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Insert maps/pictures of issues/findings.
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Insert maps/pictures of issues/findings.
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Insert maps/pictures of issues/findings.
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Southern Area Investigation
Work Completed
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Conducted additional sampling for the purposes
of delineating specific areas along historic
roadways and railways.
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Chequamegon-Nicolet National Forest
Update
Cary Pooler
Chequamegon National Forest
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National Forest Service contacted DuPont in
April 2006.
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Requested DuPont work with Forest Service to
develop a framework for future actions within the
National Forest.
DuPont met with USDA-FS on June 7th and
August 16th to discuss path forward.
Currently working with the USDA-FS to develop
the technical approach for investigation at both
sites.
Field work may begin as early as this year.
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Questions or comments?
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