INTERIM REPORT # 4 - Analysis of Surface Soil Samples STUDY TITLE Analysis o f Perfluorobutanesulfonate (PFBS), Perfluorohexanesulfonate (PFHS), and Perfluorooctanesulfonate (PFOS) in Water, Soil, Sediment, Fish, Clams, Vegetation, Small Mammal Liver and Small Mammal Serum Using LC/MS/MS for the 3M Decatur Monitoring Program DATA REQUIREMENTS EPA TSCA Good Laboratory Practice Standards 40 CFR 792 STUDY DIRECTOR Jaisimha Kesari P.E., DEE Weston Solutions, Inc. 1400 Weston Way West Chester, PA 19380 Phone:610-701-3761 .

SEVERN TRENT LABORATORIES ANALYTICAL REPORT JOB NUMBER: 249891 Prepared For: Weston Solutions, Inc. 1400 Weston Way Building 5-2 West Chester, PA 19380-1499 Project: Confidential Decatur Attention: Jai Kesari Date: 01/03/2007 Signature Name: Richard C.

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mVr07Ji\ Summary N-EtFOSE Rabbit Teratology Study Numbers: 3MT-6316.8, Argus 418-010 Compound & Lot: N-EtFOSE (N-Ethyl-Perfluoroocyanesulfonamido Ethanol) - Lot FM3923 (30035, 30037, 30039) 98.2% pure (SMD Analytical Request 52489) Analytical Documentation filed along with final report.

BACK TO MAIN Study Title Characterization Study of PFOA (lot #332), Primary Standard - Test Control Reference #TCR-99030-030 Phase: Solubility Determination Data Requirement 40 CFR 160.105(b) Author Mark E.

BACK TO MAIN MICROBIAL RESPIRATION INHIBITION TEST TEST SUBSTANCE________________ Identity: Decafluoro(pentafluoroethyl)cyclohexanesulfonate, DEA salt; may be referred to as CS-2070.

BACK TO MAIN PFOS: A 96-HOUR TOXICITY TEST WITH THE FRESHWATER DIATOM {Navcula pelliculosa) FINAL REPORT WILDLIFE INTERNATIONAL, LTD.

3 \I General Offices 3M Center St.

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j\R l% S-0J55 28 Day Percutaneous Absorption Study with FC-95 in Albino Rabbits Experiment No.: Conducted At: Dates Conducted: Conducted By: Reviewed By: de: M.

Primary Skin Irritation Test with T-3874 in Albino Rabbits / y Experiment No: Conducted At: Dates Conducted: Conducted By: Reviewed By: 0386EB0135 Pathology and Toxicology Riker Laboratories, Inc.

Afm 6- o w MECHANISM OF TOXICITY OF A UNIQUE PESTICIDE:m ETHYLPERFLUOROOCTANE SULFONAMIDE (NEPFOS), A .

A R Xlr03W BOILING POINT TEST SUBSTANCE Identity: N-Ethylperfluorooctanesulfonamide; may also be referred to as U1464, EtFOSA, EtPOSA, F-6309, or FX-12. (1Octanesulfonamide, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-N-ethyl-, CAS # 4151-50-2) Remarks: Material is a white solid of uncharacterized purity.

AR036-O3& BIODEGRADATION TEST SUBSTANCE Identity: N-methylperfluorooctane sulfonamidoethanol; may also be referred to as N-MeFOSE Alcohol, FC-790, or FM-3925. (1Octanesulfonamide, N-methyl-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-N-(2-hydroxyethyl)-, CAS # 24448-09-7) Remarks: Material is an off-white, waxy solid.