Former DuPont Barksdale Works Project Update

October 5, 2004

DuPont Corporate Remediation Group

Great Lakes Visitors Center

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Purpose of Presentation

Provide an update on the alternative water supply project.

Provide update on additional project work conducted since the July 2004 public meeting and remaining work for 2004.

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Presenters

Brad Nave– Project Director, DuPont Corporate Remediation

Group (CRG)

Alternative Water Supply Project

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Pipeline Construction UpdateAlternative Water Supply

Construction started first week of August 2004. Approximately 46,100 feet of main (ductile iron pipe

and HDPE) and service lateral (copper line to homes) was specified in the design.

To date, approximately 50% of the pipeline (based on lineal footage) has been constructed.

– Approximately 70% of the total main (~32,400 ft.) has been constructed.

– Approximately 19% of the total service lateral length (~13,700) has been constructed.

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Pipeline Construction UpdateAlternative Water Supply

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Main to be completed

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Parcels Included in Municipal Water Supply AgreementRoads

LEGEND

Lateral Services Completed to date

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Pipeline Construction UpdateAlternative Water Supply

Near term schedule:– Anticipate completion of ductile iron pipe

installation north of Nolander Road within a week.– Main will be reduced to 4-inch south of Nolander

to end of pipeline (just north of Boyd’s creek) and in Birch Grove.

– Multiple crews will be assigned to lateral line construction.

– Continue restoration of: Roadways and culverts. Shoulders and ditches (grading and seeding). Private properties.

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Pipeline Construction UpdateAlternative Water Supply

Birch Grove Schedule:– Anticipate within the next two weeks that

construction will begin and should take approximately 5 to 10 days, depending on subsurface conditions.

– Due to limited space, vehicular traffic will be restricted during main line construction.

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Pipeline Construction UpdateAlternative Water Supply

Construction completion targeted for end of calendar year 2004, assuming:

– No regulatory delays.– Outstanding contractor performance (construction and

safety).– Favorable weather.– No unforeseen or unmanageable technical issues.

A few private properties will likely have to be fully restored (final grading and seeding) in 2005, due to weather issues.

Wetlands issues at three properties have yet to be resolved; therefore, these lateral lines may be completed in 2005.

Other Barksdale Site Work

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Residential Monitoring

April 2004 sampling results transmitted to WDNR in August.

Annual change-out of carbon cylinders has been completed.

Eighty-two homes sampled at the end of August.– Preliminary results indicate no new detections of

site-related compounds. Carbon filters continue to be effective.

– Report of results pending.

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Site Investigation

Construction of new monitoring wells (10) will be completed this week.

Additional groundwater sampling to be conducted in 4Q2004.

Anticipate preliminary results in December 2004.

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Miscellaneous Site Work

Continuing work with Adventus to evaluate a new generation of soil amendments to reduce concentrations of nitroaromatic/nitramine compounds in soil.– Generation 3 product uses nano-scale zero valent

iron. Continuing Georgia Tech research on

destruction of TNT. Small repair on stream diversion to be

undertaken during the 4th quarter.

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Home Value Protection Program

Three homes purchased to date. Two have been resold.

72410 Highway 13 – purchased on June 29th

– Home is in poor condition.– Structural and moisture issues exist.– Interior mold issues exist.– DuPont is currently soliciting bids for removal of

the structure. Program will remain in effect until six months

after alternative water is available.

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Questions or comments?