AR226-2537 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region III 841 Chestnut Building Philadelphia, Pennsylvania 19107 6NV1R6NMENTAI owes In Reply Refer To; (3HW52) CERTIFIED MAIL RETUEILJRECEIPT REQUESTED 8EP 3 0 1991 PIAMT nig COPY l0 NOT RIMOVt W.

AR226-2550 DuPont Washington Works RCRA Facility Investigation Results Review Oct.28,1999 * * * * IID156232 Proposed Agenda Introductions Site Background Site Hydrogeology RFI Scope of Work RFI Results Conclusions and Recommendations Wrap-Up EID156233 Desited Meeting Outcomes To familiarize the EPA project team with the Washington Works site physical setting To share the results obtained from the recently completed RCRA Facility Investigation To provide perspective on the RFI results To propose a path forward that will ensure continued protection of human health and the environment SID156234 Main Messages for Today: The DuPont Washington Works site is well characterised and well understood, as a result of over 10 years of investigation and monitoring, The combination of TRMs and the active site hydraulic control program ensure protection of human health and the environment from site SWMUs.

FORDUPONTUSEONLY AR226-2962 Du Pont HLO 432-91 StudyTitle Skin Sens itization Test with in Guinea Pigs StudyCompletedOn July 31, 1991 ContractingLaboratory Pharmakon Research International, Inc .

2. vi.v i^u J.UKX uor. uti.L.j.

SPONSOR ElfAtochemSA.

AR226-3024 fc .

AR226-3045 Study!

SPONSOR ElfAtochemS.A.

AR226-3181 TRADE SECRET Testing Guidelines International Conference on Harmonisation (ICH) of Technical Requirements for Registration ofPharmaceuticals for Human Use.

AR226-3202 TRADE SECRET Study Title H-25134: Acute Dermal Irritation/Corrosion Study in Rabbits Laboratory Project ID: DuPont-8778 TEST GUIDELINES: OECD Guidelines for Testing of Chemicals Section 4: Health Effects, No. 404 (1992) Commission Directive 92/69/EEC EEC Method B.4 (1992) AUTHOR: Carol Finlay, B.A.

NOTOX Safety& Environmental Research LV.

CORNINGHazieton MUTAGENICITY TEST ON T-6358 30 IN AN IN VIP'OMOUSE MICRONUCLEUS ASSAY FINAL R-EPORT AUTHOR Hemalatha Murli,Ph.D.

. 6-.a5 P. 1 _ -- f} g--,-y~6 --37/'6 3M ENVIRONMENT.4L LABORATORY REPORT NO .

MICROBIOS MICROTOX TOXICITY TEST TEST SUBSTANCE______________________ _____________________ Identity: Perfluorooctanesulfonate; may also be referred to as PFO S or FC-95 or as part of the mixed product FM-3820 (see Remarks). (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test sample is FM-3820, a mixture of the test substance in diethylene glycol butyl ether and water (approximately 24-28% test substance in diethylene glycol butyl ether and water).

COViVfC^ THE DEVELOPMENT SERVICES COMPANY July 1, 1999 Covance Laboratories Inc. 9200 Leesburg Pike Vienna, Virglna 22182 Tel: 703/893-5400 Fax: 703/759-6947 Paul Lieder, Ph.D. 3M Corporate Toxicology Building 220-2E-02 St.