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Corporate Health Physics Corporate Industrial Hygiene & Ergonomics Corporate Occupational Medicine Corporate Toxicology 3M Medical Department 3M Center, Building 220-2E-02 PO Box 33220 St. Paul, MN 55 133-3220 651 "33 :1 0 May 15. 2000 Document Processing Center (Mail Code 7407) Information Management Division Office of Pollution Prevention and Toxics United States Environmental Protection Agency 401 M Street, SW ~' Room 699 East Tower Washington, D. C. 20460 Attn: FY1 Dear Sir Madam: This submission is being made per the phone conversation between Terry O'Brien (EPA) and Dan Hakes (3M) on May 10, 2000. Terry requested a non-confidential version of a specific toxicological study. I would like to confirm that portions of the "Exploratory 28Day Oral Toxicity Study with (various fluorochemicals) By Daily Gas age in the Rat Followed by a 14/28-Day Recovery Period", plus the associated laboratory report submitted to Dr. Charles Auer on May 4, 2000 is considered TSC'A Confidential Business Information. Attached for your review is a new copy of the above mentioned study to be included with the submittal on periluorooctane sulfonates made by 3M to Dr. Charles Auer dated May 4. 2000. Attached to this letter is a complete non-confidential report with the TSCA Confidential Business Information redacted. In a separate envelope is the same report with the TSCA CBI included and highlighted. Very truly yours. John L. Butenhoff, Ph,D,, C.I.H.. D.A.B.T. Manager. Corporate Toxicology Corporate Toxicology 3M Medical Department Building 220-2E-02 3M Center St Paul, MX 55144 i -1962