oa 23 er |{ PR ts 1d UNITED STATESWEANSVHIIRNOGNTMONE,NTDA.CL.P2R0O4T6E0CTION AGENCY FYZ-0301- 137 AR 226- 1003 March 20, 2001 FY1-00-801378 PreTvoeenSoFmessmnacnetss ao ADtutPn:onGterHaalsdkeLl.lKLeanbnoreadtyory Director, Applied Toxicology 8 ElNkewtaornkR,oDadE, P.1O9.71B4o-x005500 Errore.

ARa2G -- 1190 B aetrna, iets DuPont Engineering July31,2002 2 David P.

AR226-1744 Extraction of Potassium Perfluorooctanesulfonate from Red Blood Cells and Serum for Analysis Using HPLC-Electrospray/Mass Spectrometry DATA REQUIREMENTS Analytical Method Requirements Sean Gallagher ANALYTICAL REPORT DATE June 2, 2003 PERFORMING LABORATORY / TESTING FACILITY 30E3x8ygReesneRaerscehaDrrcihve State College, PA 16801 Phone: 814-272-1039 STUDY SPONSOR 3M Environmental Technology and Safety Services Building 2-3E-09 PO Box 33331 St.

AL2261770 arme DuPont Legal |3 hamAConrdporreaateVC.ouMnasellinowski DW1u0i0Pi7onngMtairoLkeneg,talDSteDrl-ea7ewt0a7r8e 19898 Foc" Smet E-mail: AMnadrleia.nVo.wski@usa.dupont.com FYI- 0S04. 0157 mn | or275_ 07 3 | T HARE ERRIT AERTII ET April 29, 2004 VIA OVERNIGHTMAIL CONTAINS NO CBI Mr.

"_ _ 3M Special/3' Maleria|s July 16, 2002 3M Cenler St.

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TOXICITY TO TERRESTRIAL PLANTS TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test substance is a white powder.

Toxicological Summary PFOS Dietary Acute Mallard Study Test Substance: Perfluorooctanesulfonate (PFOS) Structure: 1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-, potassium salt, CAS# 2795-39-3 Remarks: The test substance is a white powder (3M lot #217).

AR226-2231 December 10,2001 CERTIFIED MAIL RETURN RECEIPT REQUESTED Mr.

AR226-2500 September 17,2001 GONMIAL CERTIFIED MAILRETURN RECEIPT REQUESTED Ms.

AR226-2813 Study Title Ammonium Perfluorooctanoate: Age Effect on the Plasma Concentration in Post-Weaning Rats Following Oral Gavage AUTHOR: Xing Han, Ph.D.

TRADE SECRET AR226-3191 DuPont-8838 Study Title H-24944: Static, Acute, 96-Hour Screening Test to Pimephales promelas Laboratory Project ID: DuPont-8838 AUTHOR: Laurie D.

AR226-3207 DuPont-5991 TRADE SECRET Study Title H-24516 : Developmental Toxicity Study in Rats Laboratory Project ID: DuPont-5991 TEST GUIDELINES : U.S .

<n. ' 3M Rese I SITING 4g 026 = 3ST7S \\ FFT RE Certified Mail December 19, 2005 4EuWQl-JAFR I-FL 3TY ZeHR_ 1208- 00374 DRoocoumme6n4t28Prosesing Center (Mail Code 7407M) Attention: TSCA 8() Coordinator OU1fS2f.0i1cEeCnoovnfPisortloitlnumutetiniotonanAlPvPrerenovuteeenc,ttiNio.onn.aAngdeTnocxyics Washington, D.

ADDENDUM NUMBER I TO THE SECONb SEMIANNUAL PROGRESS REPORT FLUOROCHEMICAL (FC) SITE RELATED ENVIRONMENTAL ASSESSMENT PROGRAM 3M COTTAGE GROVE, MN FACILITY March 2006 Prepared for 3M Company WESTON SOLUTIONS, INC.