Document OEE354ZnmVBG5dEgLxO8wvE5p

Katherine E. Reed, Ph.D. Staff Vice President 3M Environmental, Health and Safety Operations 8&tQ rll07-tf)2>73 p. 1 900 Bush Avenue, Building 42-2E-26 PO Box 33331 St. Paul. MN 55133-3331 651 778 4331 2 Z b -3 V ? f Certified Mail November 16, 2007 Document Processing Center EPA East - Room 6428 Attn: Section 8(e) Office of Pollution Prevention and Toxics US EPA 1200 Pennsylvania Avenue NW Washington DC 20460-0001 NO CBI . COHtSin f'JO QOf Re: TSCA 8(e) Substantial Risk Notice: Supplemental to Docket No. 8EHQ-0598-373; Sulfonate-based and Carboxylate-based Fluorochemicals To whom it may concern: 3M is submitting 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 perfluorooctanoate (PFOA) in a small sampling of residential wells (less than 20) located in a discrete location near the 3M Cottage Grove production facility in the city of Cottage Grove, MN (Langdon area). A split sample analysis has since been performed by 3M and the Minnesota Department 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 reported by the MDH. Final reports from both 3M and the MDH are enclosed. Although levels of perfluorobutanoate (PFBA) were also detected in these samples and included in these reports, 3M does not consider these data reportable under TSCA 8(e). Please note that individual property owners' names were redacted by 3M from the MDH report. 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. ' Sincerely, Katherine E. Reed Staff Vice President, Environmental, Health and Safety Operations Enclosures (2) 89080000044 ? 90E 00 044 2