Former DuPont Barksdale Works Project Update October 5, 2004 DuPont Corporate Remediation Group Great Lakes Visitors Center

October 5, 2004Former DuPont Barksdale Works Project Update2 Purpose of Presentation n Provide an update on the alternative water supply project. n Provide update on additional project work conducted since the July 2004 public meeting and remaining work for 2004.

October 5, 2004Former DuPont Barksdale Works Project Update3 Presenters n Brad Nave – Project Director, DuPont Corporate Remediation Group (CRG)

Alternative Water Supply Project

October 5, 2004Former DuPont Barksdale Works Project Update5 Pipeline Construction Update Alternative Water Supply n Construction started first week of August n Approximately 46,100 feet of main (ductile iron pipe and HDPE) and service lateral (copper line to homes) was specified in the design. n 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.

October 5, 2004Former DuPont Barksdale Works Project Update6 Pipeline Construction Update Alternative Water Supply Main completed Main to be completed

October 5, 2004Former DuPont Barksdale Works Project Update7 Lateral Services Completed to date

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October 5, 2004Former DuPont Barksdale Works Project Update14 Pipeline Construction Update Alternative Water Supply n 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: n Roadways and culverts. n Shoulders and ditches (grading and seeding). n Private properties.

October 5, 2004Former DuPont Barksdale Works Project Update15 Pipeline Construction Update Alternative Water Supply n 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.

October 5, 2004Former DuPont Barksdale Works Project Update16 Pipeline Construction Update Alternative Water Supply n 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. n A few private properties will likely have to be fully restored (final grading and seeding) in 2005, due to weather issues. n Wetlands issues at three properties have yet to be resolved; therefore, these lateral lines may be completed in 2005.

Other Barksdale Site Work

October 5, 2004Former DuPont Barksdale Works Project Update18 Residential Monitoring n April 2004 sampling results transmitted to WDNR in August. n Annual change-out of carbon cylinders has been completed. n 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.

October 5, 2004Former DuPont Barksdale Works Project Update19 Site Investigation n Construction of new monitoring wells (10) will be completed this week. n Additional groundwater sampling to be conducted in 4Q2004. n Anticipate preliminary results in December 2004.

October 5, 2004Former DuPont Barksdale Works Project Update20 Miscellaneous Site Work n 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. n Continuing Georgia Tech research on destruction of TNT. n Small repair on stream diversion to be undertaken during the 4 th quarter.

October 5, 2004Former DuPont Barksdale Works Project Update21 Home Value Protection Program n Three homes purchased to date. Two have been resold. n Highway 13 – purchased on June 29 th – Home is in poor condition. – Structural and moisture issues exist. – Interior mold issues exist. – DuPont is currently soliciting bids for removal of the structure. n Program will remain in effect until six months after alternative water is available.

October 5, 2004Former DuPont Barksdale Works Project Update22 Questions or comments?