SOIL ADSORPTION - REVISED TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1Octanesulfonicacid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-, potassiumsalt, CAS # 2795-39-3) Remarks: The test substance is a white powder.

ENCLOSURE 4 Description of the 3M Decatur Inactive Landfill Containment Structure At the 3M Decatur site, a RCRA interim remedial measures (IRM)program is currently underway to construct a containment structure for an inactive landfill.

- - - PFOS: A PILOT REPRODUCTION STUDY WITH THE NORTHERN BOBWHITE FINAL REPORT WILDLIFE INTERNATIONAL,LTD.

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AR226-2313 y David M Rurak 03/16/2003 07:01 PM To: cc: Subject: Catherine A Barton/AE/DuPont@DuPont Martc C Hause/DuPontQDuPont.

AR226-2486 ^ David M Rurak 09/06/200201:11 PM To: cc: Subject: Robert F Pinchot/DEV/AE/DuPont@DuPont Environmental coordination _...TM_-^-- Foiwarded by David M Ruralt/AE/DuPont on 09/OS/2002 01:10 PM -- /^ Uma Chowdhry 08/28/2002 11:16 AM To: cc: Subject: David M RRuurraaklv/AAEE//ODuuPPoormrt@@UDuuPPoonntt Environmental coordination Dave, I hear you are the env coordinator for the C8 issue.

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AR226-2594 .^ ^y KatherinB L Davis 08/23/2002 11:31 AM To: cc: Subject: Andrew S Hartten/AE/DuPont@DuPont, Mark Houlday/AE/DuPorrtQDuPont, Tobin D Lounsbury/AE/DuPontQDuPont, Michael P ShBrri8r/AE/DuPont@DuPont, J Stephen Opp/AE/DuPont@DuPont.

"McCrea, Deborah" <mccrea@taftlaw.com> 03/06/2009 02 :34 PM Taft I Deborah McCrea / Legal Assistant Taft Stettinius & Hollister LLP 425 Walnut Street, Suite 1800 Cincinnati, Ohio 45202-3957 Tel : 513 .381 .2838 " Fax : 513 .381 .0205 www.taftlaw.com / mccrea@taftlaw .com To NCIC OPPT@EPA cc "Bilott, Robert A."

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:- AR 226 _ 0696 ACUTE TOXICITY TO AQUATIC INVERTEBRATES (ACARTIA TONSA) TEST SUBSTANCE Identity: A mixture containing perfluorooctanesuifonate, which may also be rOecftearnreesdutiofoansicPFacOiSd,) (FCCA-S95#o2r7a9s5-a39c-o3m)ponent of FC-201AF. (1- Remarks: The 3M production lot number was not noted.