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So AR224-1907 Report Title Evaluationofthe Northwest Bioanalytical Method Validation Reports for PFOS and Related Analytes in Human Serum or Plasma in Meeting the Requirementsofthe EDABioanalyticalMethod Validation QAI Report No. 405-503 ------ Data Requirement Full Validation of Bioanalytical Method Author Nancy Benson Philippe Ourisson `QUALITYASSOCIATES, INC. 9017 Red Branch Road, Suite 102 Columbia, MD 21045 { `Sponsor 3M Environmental Laboratories 935 Bush Avenue Bldg 2-3E-09 St Paul, MN 55106 Report Date December 31, 2001 Report Number QAI 405-503 Number of Pages 26 337 !

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ACTIVATED SLUDGE RESPIRATION INHIBITION TEST SUBSTANCE Identity: rPeefrefrlrueodrotoocatsanPeFsuOlSfAoAny,laFmCi-d1o(2e8thoyr)aascetthaetem;ajmoarycaolmspoobneent of FC-127, FC-129, FC-109, FC-109-X or R1904.

AAR126-0HOG ACUTE TOXICITY TO FISH (FATHEAD MINNOW) TEST SUBSTANCE Identity: rPeefrefrlrueodrotoocatsanPesFuOlSfoAnAy,lamFiCd-o1(2et8hoyrl)aascetthaetem;ajmoarycoalmspoobneent of eFtCh-y1l2-7N-,{(FhCe-p1t2ad9e,caFfCl-u1or0o9o,ctFyCl)-s1u0l9fo-nXylo}r-,R1p9o0t4a.ssi(Gulmycsialnte,,CNA-S # 2991-517) Remarks: The test sample is FC-129 referred to by the test laboratory as R1904.

ARI2G-OHOY MICROBICS MICROTOX TOXICITY TEST TEST SUBSTANCE Identity: Perfluorooctanesulfonylamido(ethyl)acetate; may also be referred to as PFOSAA, FC-128 or as the major component of eFtCh-y1l2-7N-,[(FhCe-p1ta2d8e,caFfCl-u1or0o9o,ctFyCl)-s1u0l9fo-nXylo]r-,R1p9o0t4a.ssi(Gulmycsialnte,, N- CAS # 2991-517) Remarks: The test sample is FC-129 referred to by the test laboratory as R1904.

ACUTE TOXICITY TO AQUATIC PLANTS (ALGAE) TEST SUBSTANCE Identity:Perfulorooctanesulfonylamido(ethyla)cetate;may also be referredtoas PFOSAA, FC-1 28 or as the major component of FC-127, FC-1 29, FC-1 09, FC-1 09-X or Rl 904.

AR224- 1905 Sponsor: St.Paul,aMMinnesota <n OCnHcARstLnLEdABSpOyRnRATIrOVsREeInERiS Study Title: Cell Proliferation Study with N-Ethyl Perfluorooctanesulfonamido Ethanol (N-EtFOSE; 3M T6316.11), Perfluorooctane Sulfonic Acid Potassium Salt (PFOS; 3M T-6295.16), and N-Ethyl Perfluorooctanesulfonamide (N-EtFOSA; 3M T-7091.1) in Rats Study Number: TRC 1132-100 Performing Laboratory: Gene Logie, Ine.

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ACUTE TOXICITY TO AQUATIC PLANTS (ALGAE) TEST SUBSTANCE Identity: Perfluorooctanesulfonylamido(ethyl)acetate; may also be referred to as PFOSAA, FC-128 or as the major component of FC-127, FC-129, FC-109, FC-109-X or R1904.

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BIODEGRADATION TEST SUBSTANCE Identity:Perfluorooctanesulfonylamido(ethyl)acetmaatye;also be referredto as PFOSAA, FC-128 or as the major component of FC-1 27, FC-129, FC-1 09, FC-1 09-X or Rl 904.