@1132003 10:05 0y1/03 opie W DEP LEGAL SERVICES 915133010205 hese ilies E304 oz6 3738 ama Apa 9g | SOS @ ney 7012 McDCiovrikslieonAvoefnAei,rSoQuualEixtny TelepFhoanxe NNuurmsbbeerr::((330044))952266..33772319" West GDoonvweer Virginia Department of Environmental Protection StAepihraeneCRaTiivsmeSrenerreer March 13, 2003 CERTIFMIALE_D_ 7002 0860 0001 4581 3412 Paul J, Bossert Jr.

AR226-1532 33 PP Screening level cumulative risk assessment perfluorinated alkyl acids on human health Rich Purdy RECEIVED OPPT NCIC 2003 OCT-9 PM9:30 Guidance on Cumulative Risk Assessment of Pesticide Chemicals That Have a Common Mechanism of Toxicity.

3M Environmental Laboratory Final Report- Analytical Study Single-Dose Dermal Absorption/ToixnicRiatbybiSttsudy of T-6067, T-6068 and T-6069 +- In-Vivo Study Reference Number: HWI#6329-152 Study Number: AMDT-011095.1 Test Substance: L-13492 (T-6067, T-6068 and T-6069) Name and Address of Sponsor: 3M SCD Division S3t6. 7PGaurlo,vMe NStre5e5t106 Name and Address of Testing Facilit3yM: Environmental Technology & Services .

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BACK TO MAIN TOXICITY TO AQUATIC PLANTS (Freshwater alga, Anabaena flos-aquae) TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (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: Sample from 3M production lot number 217.

PFOS: AN ACUTE TOXICITY STUDY WITH THE EARTHWORM IN AN ARTIFICIAL SOIL SUBSTRATE FINAL REPORT WILDLIFE INTERNATIONAL, LTD.

TOXIKON FINAL REPORT: 01-7019-G1 _CHO/HGPRT FORWARD MUTATION ASSAY- ISO (T-6889.7) Author DevaldSadhu,Ph.D.

SRPT T-7& J MIN 314l022208 PERJ%UOROO~AlVE2WLFONYLFLUORIDE T-7 b ,OSF) t .a BACTERJAL REVERSE MUTATION TEST Sponsor 3M Center 3M Corporate Toxicology Building 220-2E-02 St Paul I"55133-3220 USA Research Laboratory HuntingdonLife SciencesLtd.

AR226-2185 EXPOSURE EVALUATION FOR NEW PROCESS AT FAYETTEVILLE SITE Prepared by DuPont Engineering Technology Debbie Mulrooney Cathie Barton August 20,2001 EID293489 TABLE OF CONTENTS Executive Summary 1.

AR226-2271 CITTr--"" ' ^ DebbiBJMulrooney 04/04Q00201:17PM To: cc: Subject Robert F Pinchot/DEV/AE/DuPont@DuPont Bernard J Reilly/ABDuPont@DuPont Deposition Results and Modeling Report @l Rob, Here are the deposition results for the 2003 emissions for Little Hocking and Lake Washington: Watershed Deposition Results - 2003 Emissio Also, here is the final modeling report: Final Modeling Report.di RP026414 EID582607

AR226-2305 Bl/i4^Z303 ' ffi-'te'-SBEQ 16:46 la'as W DBP LBBRL SER-IICES 93403681 Amp-k?

AR226-2512 cnrr Hidetaka Hiromatsu 04/02/2002 09:04 AM To: cc: Subject: Andrew S Hartten/AE/DiiPont@DuPont David M Rurak/AE/DuPont@DuPont.

AR226-2514 From: Dick J C Meijer on 04/03/2002 07:38 AM CET To: cc: Subject: Ta-Wei Fu/SE/DuPorrt@DuPont Ton Rbelen^UR/DuPont@DuPont, Stephen R Peck/SE/DuPont<s>DuPont, Yoshihiro Hayatsu/PO/DuPont@DuPont, Hidetaka Hiromatsu/PO/DuPont@DuPont, Paul K Mathur/CL/DuPont@DuPbnt, Akito Aba/AE/DuPont@DuPont.