3M MEDICAL DEPARTMENT CORPORATE TOXICOLOGY ARUrO/50 To: Andrew Seacat 220-2E-02 cc: John Butenhoff 220-2E-02 From: MarvCase 220-2E-02 Subject: Pathology Review Date: 22 July 1999 On 19 July 1999 during my visit at Covance, Madison, I did a slide review of selected tissue sections on the PFOS six-month monkey toxicity study (Study 6329-223).

BACK TO MAIN MULTI-CITY STUDY FIELD REPORT FOR MOBILE ALABAMA AND PENSACOLA FLORIDA - BATTELLE DUXBURY ACTIVITIES for Project Number N100672-01 Submitted to September 29,1999 Prepared by Christopher Gagnon Battelle 397 Washington Street Duxbury, MA 02332 (781) 934-0571 BAk T MAIN Table of Contents Page: i TABLE OF CONTENTS Page 1.

PFOS: A DIETARY LC50 STUDY WITH THE MALLARD WILDLIFE INTERNATIONAL LTD.

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AR - 02So ACU TE TOXICITY TO AQUATIC IN V ERTEBRA TES (DAPHNIA MAGNA) T E S T S U B S T A N C E ___________________________________________________ Identity: A mixture containing perfluorooctanesulfonate, which may also be referred to a s P F O S , FC-95, or as a component of FC -787 or FC 787X. (1-Octanesulfonic acid) (C A S # 2795-39-3).

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t4 R & H 6 - 077/ ACUTE TOXICITY TO AQUATIC INVERTEBRATES (DAPHNIA MAGNA) TEST SUBSTANCE________________________________________________ Identity: Mixture containing perfluorooctanesulfonate which may also be referred to as PFOS, FC-95, or as a component of FC-203FC. (1Octanesulfonic acid) (CAS # 2795-39-3).