RECEIVED PFOS Ecotoxicological Testing Results OPlfyffQpprison of Effect Concentrations Calculated Using Different Sample Purity M H M rr^an {n fasured concentrations, except where * (nominal).

LABORATORY-SCALE THERMAL DEGRADATION OF PERFLUOROOCTANYL SULFONATE AND RELATED SUBSTANCES TEST SUBSTANCE_______________________________________ Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or C8F17SO3-K+. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-, potassium salt, CAS # 2795-39-3).

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

Larry K.

ildlife International, Ltd ECOTOXICOLOGY & ANALYTICAL TESTING SERVICES November 27,2000 Ms.

Andrew Seacat 04/28/04 01:44 PM To: Melinda M.

Katherine E .

3M General Offices Certified Mail 3M Center St.

Hollvhouse Inc PO Box 474 1771 Sandy Point Rd.

H18636: Slide Review of pancreas lesions from DuPont APFO Study Date of Review: 28thNovember 2001-11-29 Reviewing Pathologists: Dr E E McConnell and Dr J R Foster Study No: HN-18636 Study Title: Combined Chronic Toxitity/Oncogenicity Study with Linuron, C8 and W yl4,643.

A R t t r O 3f l0 ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE Identity: Perfluorodecanesulfonate, ammonium salt; may also be referred to as PFDS, FC-121-X, or 3M Sample E2112 and E2566-1. (1Decanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heneicosafluoro-, ammonium salt, CAS # 67906-42-7) Remarks: Test sample is a mixture of the test substance in water and 2propanol, 1-(1,1-dimethylethoxy).

ARIX-OSfl ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE Identity: Perfluorooctylsulfonate, didecyldimethylammonium salt; may also be referred to as Fluoroalkyl ammonium derivative. [1Decaminium, N-decyl-N,N-dimethyl-, salt with 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-1octanesulfonic acid (1:1), CAS # 251099-16-8] Remarks: The 3M production lot number was Lot 1.

A R 2% -0 % \ Argus Research Laboratories, Inc. 905 Sheehy Drive, Building A Horsham, Pennsylvania 19044 T: (215) 443-8710 F: (215) 443-6587 PROTOCOL 418-008 SPONSOR'S STUDY NUMBER: 6295.9 STUDY TITLE: Combined Oral (Gavage) Fertility, Developmental and Perinatal/Postnatal Reproduction Toxicity Study of PFOS in Rats.

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3M Environmental Laboratory Results from Analyses of Soil and Groundwater Samples From the E.