3M GeneralOMces 31MCenter St.PauiM,N 55144-1000 6127331110 April28,2000 Mr.OscarHernandez US EPA/OPPT/CCD (7405) 401 M StreetS,W Room E615B Washington,DC 20460 Dear Oscar: As partoftheongoingvoluntarysubmissionof dataand informationon perfluorooctanseulfonicacid(PFOS) toEPA by 3M, enclosedisinformationon use and exposurerelatintgo,PFOS (Attachment1).Thisinformationispresented followingtheforrnaotfa "Use and ExposureInformatioPnrofile"(UEIP)as recommended to ')M by EPA OPPT management.

AdsorptionofFC 95 and FC 143 on Soil(Note:the3M Env.

3M 3M Specialtfyvlaterials 3M Center St Paul,MN 55144-1000 6517331100 May 15,2000 F8-07?

3M MEDICAL DEPARTMENT, CORPORATE TOXICOLOGY ProtocolforStudy No.

3M MEDICAL DEPARTMENT, CORPORATE TOXICOLOGY ProtocoflorStudyNo.T-6316.17T,-6295.21T,-7132.3S;T-41 FecesMethod Develot)menMtetabolismStudyforPerfluorooetanesulfonate Derivatives.

Subr:iittetdo: BIOSEARCH I.I@4C.

STABILITY IN WATER (HYDROLYSIS) TEST SUBSTANCE Identity:N2-(N-methylperfluorooctanesulfonamido)-etahcyrlylatem;ay alsobe referredto as N-MEFOSEA, or MEFOSEA. (2-Propenoicacid,2[[(heptadecafluorooctyl)sulfonyl]methylaminoe]settehry,ClAS 25268-77-3) Remarks: Materialisan amber, waxy solid,coded THAR3F2.

oral Toratology Study of T-314ICoC in Rabbits RECE!

MICROBICS MICROTOXO TOXICITY TEST TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonawthei,ch may alsobe referredtoas PFOS, FC-95, oras a component ofFC-203. (1Octanesulfoniaccid)(CAS # 2795-39-3).

ACTIVATED SLUDGE TEST SU RESPIRATION INHIBITION TEST Identity:Mixturecontainingperfluorooctanesulfonawtheich may alsobe referredtoas PFOS, FC-95, or as a component of FC-203FC. (1Octanesulfoniaccid)(CAS # 2795-39-3).

ACUTE TOXICITY TO FISH (FATHEAD MINNOW) TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may alsobe referredtoas PFOS, FC-95, or as a component ofFC-206A. (1Octanesulfoniaccid)(CAS # 2795-39-3).

ACUTE TOXICITY TO AQUATIC INVERTEBRATES TEST SUBSTANCE (DAPHNIA MAGNA) Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may alsobe referredto as PFOS, FC-95, or as a component of FC-206CE. (1Octanesulfoniaccid)(CAS # 2795-39-3).

MICROBICS MICROTOXS TOXICITY TEST TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may alsobe referredtoas PFOS, FC-95, oras a component ofFC-206CE. (1Octanesulfoniaccid)(CAS # 2795-39-3).

ACUTE TOXICITY TO FISH (GOLDEN ORFE) TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may alsobe referredtoas PFOS, FC-95, oras a component ofFC-603EF. (1Octanesulfoniaccid)(CAS # 2795-39-3).

TOXICITY TO AQUATIC PLANTS TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may alsobe referredtoas PFOS, FC-95, or as a component of FC-603F.