Internal Correspondence *7ARlTJo-OHtH oaJ To: D.

BIOSEARCH INCORPORATED P O- B O * B5* 8 ' PHILADELPHIA.

M AL6 - O Z ^ O ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE________________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of FX-601. (1Octanesulfonic acid) (CAS # 2795-39-3).

BIODEGRADATION (BOD/COD) TEST SUBSTANCE ___________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of L-4647. (1Octanesulfonic acid) (CAS # 2795-39-3).

BACK TO MAIN OCTANOL/WATER DISTRIBUTION COEFFICIENT TEST SUBSTANCE______________________ Identity: Decafluoro(pentafluoroethyl)cyclohexanesulfonate, DEA salt; may be referred to as CS-2070.

AR506-O3SI MICROBIOS MICROTOX TOXICITY 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).

AR - 0757 TO XICITY TO AQUATIC PLANTS TEST SUBSTANCE_______________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of FC-203CE. (1Octanesulfonic acid) (CAS # 2795-39-3).

AR ^ 2 6 - ACTIVATED SLUDGE RESPIRATION INHIBITION TEST TEST SUBSTANCE________________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of FC-206CE. (1Octanesulfonic add) (CAS # 2795-39-3).

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AfUlt-oiOG UNION C A R B ID E BUSHY RUN RESEARCH R.

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

Internal Correspondence cc: R.

AfL ASL6 - 07A 3 ACUTE TO XIC ITY TO AQUATIC INVERTEBRATES (DAPHNIA MAGNA) TEST SUBSTANCE_______________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to as PFOS, FC-95, or as a component of FC-203CE. (1Octanesulfonic acid) (CAS # 2795-39-3).