Document Y99dE44rmoBoDX3bYqv9v2e2K

Katherine E. Reed, Ph.D. Staff Vice President rSlip Certified Mail 3M Environmental, Health and Safety Operations 0 70&- 0037H- p. 1 900 Bush Avenue, Building 42-2E-26 PO Box 33331 St. Paul, MN 55133-3331 651 778 4331 A d Si6 _ 36AV" June 29, 2006 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 CBI 89060000375 8906000 03;5 Re: TSCA 8(e) Substantial Risk Notice: Sulfonate-based and Carboxylic-based Fluorochemicals, Docket Nos. 8EHQ-1180-374; 8EHQ-0381-0394; 8EHQ-0598-373 - Pilot Study to Assess Serum Fluorochemical Concentrati.oanv^ i.n American Red Cross Blood Donors, 2005. s Dear Sirs: I '0 0 cn 3M is submitting this notice to supplement its previous submissions on sulfonyl and carijoxylicP3 based fluorochemicals. 3M has recently received the enclosed final report for serum ^ fluorochemical concentrations in a small sample population o f American Red Cross bloed donors in 2005. The purpose of this pilot study was to determine whether general population PFOS and PFOA concentrations, as measured in 2005 in a small sample o f American Red Cross blood donors, may represent a decline from prior general populations measurements made in 2000. The study found that there was an approximate 50 percent decline in serum concentrations of PFOS and PFOA consistently observed across sex and two age categories for both PFOS and PFOA. 3M does not believe that these data indicate a "substantial risk of injury to health or the environment." Nevertheless, 3M has decided to report these data, recognizing the ongoing work by U.S. EPA to assess fluorochemical exposure pathways and potential risks. If you have any questions, please do not hesitate to contact Dayna Blomquist at 651-736-5413. Sincerely Katfterine E. Reed Staff Vice President Environmental, Health and Safety Operations I