Document ymJeZkoX0r0Zd9g71JmrkbYRd

Atlanta Denver Los Angeles Philadelphia T homas b . J ohnston (202) 496-7656 g-EH&_ 1006. McKenna Long & Aldridge^ Attorneys at Law San Diego San Francisco ^ ^ A IN NO C|1900 K Street, NW Washington, DC 20006 Washington, DC 202.496.7500 Fax: 202.496.7756 w w w .m cken n alo n g .co m Brussels M li - 37^-3 EMAIL ADDRESS tjohnston@mckennalong.com October 9,2006 BYcertified mail Document Processing Center (7407M) Office of Pollution Prevention and Toxics US Environmental Protection Agency 1200 Pennsylvania Avenue, NW Washington, DC 20460-0001 ATTN: TSCA Section 8(e) Coordinator Re: 8EHQ-04-15856 Dear Document Control Officer: On behalf of E.I. du Pont de Nemours and Company, we hereby submit supplemental information regarding prior submission 8EHQ-04-15856. The enclosed information is a summary of a manuscript previously submitted under this number. The manuscript and summary describe how a retrospective exposure analysis using various environmental models was conducted to estimate potential intake of perfluorooctanoic acid (PFOA) over the past 53 years by persons residing in parts of Ohio and West Virginia. DuPont does not believe that the enclosed information triggers reporting obligations under TSCA 8(e). The information does not reasonably support a conclusion that the chemicals in question present a substantial risk to health or the environment. It does not relate to any possible effect, but only to theoretical exposure. If you have questions, please contact me at the number above. Sincerely, 89070000013 ? O '* o o CO Thomas B. Johnston Counsel for E.I. du Pont de Nemours and Company cc: Mary Dominiak Chemical Control Division Office of Pollution Prevention and Toxics