Document JrZdVkOYJjLke4JKGOdrLn1k2

y L\ ^ * DuPont Haskell VFn. f. J^ Mr. Charles M. Auer, Director U. S. Environmental Protection Agency Office of Pollution Prevention & Toxics Chemical Control Division 401 M Street, N.W. - Room 403 Washington, D.C. 20460 Dear Mr. Auer: A& AA. 6 - O& Olj- DuPont Haskell Laboratory for Toxicology and Industrial Medicine Elkton Road, P.0. Box 50 Newark, DE 19714-0050 FtX-Ofo 0 - / 3 7 * f May 2, 2000 original ess* CP c2 t 03 yy* 0^0 -o rn " 0 <n --t rn -- i"* CO p -i CO CO sr <r> Our thanks to you and the other participants in our May 1 meeting in Washington. Steve Korzeniowski and I appreciated the opportunity to discuss and understand your request for information about PFOS, PFOA and other perfluorinated carboxylic and sulfonic acids. Likewise, we hope our dialog has provided you with a better understanding of DuPont's products and Telomer chemistry. To briefly recap, DuPont does not manufacture or convert PFOS-based ECF intermediate products. DuPont does not manufacture PFOA, although we do purchase and use it as a surfactant in making fluoropolymers. DuPont does manufacture "Telomer-based" products. As we presented, Telomer-based materials are structurally and chemically different than ECF-based materials. In addition, we shared biopersistence-screening data on Telomer-based products which showed a difference of the Telomer products biopersistence relative to PFOS. We also overviewed the body of toxicology information we have for Telomer-based materials. We will provide the information we have regarding exposure, environmental and toxicology of PFOS, PFOA and any other perfluorinated sulfonic or carboxylic acids to the agency as requested. Specifically, we will provide toxicity testing information on PFOS, PFOA and perfluorononanoic acid by May 26, 2000. Concerning ammonium PFOA, we will provide a summary of U.S. employee exposure information, historical use and release information from U.S. DuPont facilities by compartment, and a summary of releases that may result from the industrial use of our products. Although we hope to provide you with this information by your requested date of May 26, 2000, we will more likely need at least until June 23, 2000, to gather and summarize this type of information. Our understanding is that you are interested only in perfluorinated materials at this time; therefore we will not plan to include information on our Telomer-based materials. Thank you again for providing us with a clear understanding of the agency's concerns, needs and direction. We appreciate the opportunity to have open and direct dialog with you and look forward to working together in the future. c 85010000010 3. r.sc 85010000010 lu f c,,; LO I FYI-00-001378 -ctL// f - Gerald L. Kennedy Director, Applied Toxicology and Health 7 FYI-00-001378 E. I. du Pont de Nemours and Company I Primed on Recycled Paper HL-H Rev. 5/97