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AR226-0136 9 } STUDY CODE: K01-1802 [Receipt No.

6295.23; ST-46 Protocol.

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AR 226- fool 2 (io 2001.

Norwest Biosnlyical ARRQG -- 1212 rSetpuodnyirNoo NNwWBBSR0O0L-O1G28E Quantitative Determination of PFOS and Related Compounds in Human Serum by LC/MS/MS Sample Analysis Report for Protocol EPI-0013 NortAhwDeisvtisBiioonanoaflNytWicTalI(ncN.

AR 246 _ 1236 rSSoaebordntemnnnainaghs,h ipo 8 5h DuPont Engineering November 20, 2002 David P.

ARBBG - 1284 March 31,2003 2 To:MUSa"rEFyn.vDiormoinnmieankal Protection Agercy EPA East (Mail Code 7405M) W1a2s0h0iPnegninosny,lvDaCnia20A4v6e0nue, NW.

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AR R26 - 07/0 BIODEGRADATION (BOD/COD) EST SUBSTANCE Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of FC-203. (1Octanesulfonic acid) (CAS # 2795-39-3).