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BACK TO MAIN BIODEGRADATION (METHYLENE BLUE ACTIVE SUBSTANCE) 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 field: The 3M production lot was 158.

BACK TO MAIN MULTI-CITY STUDY FIELD REPORT FOR COLUMBUS GEORGIA AND PORT ST.

3M Envirormeahl, Hcrltb 811d sddy Opcmti- 900 Bush Avenue.

Lab0ratoyRep-t-Revision1 Analytical Reportof Data for PFOS Dietary LC50 Studiyn Northern Bobwhite (Sera and Liver) Laboratory Report No.FACT-TOX-129 (U2723) Testing Laboratory ~~~ ~ 3M Environmental Technology& Safety Services 3M Environmental Laboratory FluorineAnalybcal Chemistry Team (FACT) 2-3E-09 935 Bush Avenue, St.

AR226-2031 ZIPFEL 11/05/97 11:39 AM To: CC: Subject: BROWNAL.

AR226-2036 PECKSR 07/28/98 11:53 AM To: cc: Subject: SZAKATBK, MILLERSR, HALBERRM PLAYTIS , MILLERW , PARSONMA, MAYLESM , ZIPFEL pathforward and problems with detemiination of C8 In air Based on high reported C8 results for -the air samples collected on and due to erratic 6C results, I recommend resareples be taken from these locations.

AR226-2062 ^ ^ v^f?

AR226-2102 Te^fiesHte .....^...j^aws-.

AR226-2175 Chris E Shoop 08/08/2001 05:23 PM To: cc: Subject: Debbie J Mulrooney/AE/DuPont@DuPont Robert L Ritchey/CL/DuPont@DuPont, M.

AR226-2258 y Todd M Krieger 02/20/2002 12:33 PM To: cc: Subject Steven H Swearingen/AE/DuPont@DuPont Debbie J Mulrooney/AE/DuPont@DuPont.

AR226-2294 DRAFT 3 DuPont Statement on January 7, 2003, Letter from Ohio EPA Regarding "Air impacts in Ohio due to emissions of C8" In a January 7, 2003, letter to Paul Bossert, Plant Manager at DuPont Washington Works, Ohio EPA Director Christopher Jones refers to "concern over ambient levels of C8, as predicted by air quality modeling of year 2000 actual emissions."

AR226-2315 /y Charles J Zarzecki 03/19/2003 11:31 AM To: cc: Subject Catherine A Barton/AE/DuPont WVC8 Modeling Cathie, I took a look at the location of the maximum predictions in the VW C8 modeling summary.