Document v6MzyekemoBpww0Ngy241K4a9

p. 1 Katherine E . Reed, Ph .D . 3M Environmental, Health and 90 0 Bush Avenue, Building 42-2E-26 Staff Vice President Safety Operations PO Box 3333 1 St . Paul . MN 55133-3331 651 778 4331 Certified Mail November 16 , 2007 Document Processing Cente r ~ EPA East - Room 6428 A ttn : Section 8(e) Offi ce of Pollution Prevention and Toxics US EPA 1200 Pennsylvania Avenue NW Washington DC 20460-000 1 C9 O 73 NO CBI Contain rjo !,-z Re : TSCA 8(e) Substantial Risk Notice : Supplemental to Docket No . 8EHQ-0598-373 ; Sulfonate-based and Carboxylate-based Fluorochemical s To whom it may conce rn: 3M is submi tt ing this notice to supplement its previous submissions on sulfonate-based and carboxyate-based fluorochemicals . In August of 2007 3M notified the EPA that data had been received from the MN Pollution Control Agency (MPCA) showing detectable levels of perfl uorooctanoate ( PFOA) in a small sampling of residential wells (less than 20) located in a discrete location near the 3M Co ttage Grove production facility in the city of Cott age Grove, MN (Langdon area) . A split sample analysis has since been performed by 3M and the Minnesota Depa rtment of Health (MDH) to compare results obtained by each group upon analysis of these samples . Results reported by each group were similar, with concentrations of PFOA ranging from 0 .280 - 1 .13 ppb as reported by 3M and from 0 .2 - 1 .0 as report ed by the MDH . Final reports from both 3M and the MDH are enclosed . Although levels of perfl uorobutanoate (PFBA) were also detected in these samples and included in these repo rt s, 3M does not consider these data reportable under TSCA 8(e) . Please note that individual property owners' names were redacted by 3M fr om the MDH repo rt . No other information was modified . If you have any questions or need additional information, please contact Deanna Luebker at (651) 737-1374 or djluebker@mmm .com . r ' Sincerely , Katherine E . Ree d Staff Vice President, Environmental, Health and Safety Operations Enclosures (2) F9oFon0004 4 / 3o8I~~