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0 3M Corporate Toxicology 8 Id Rcgulrtoy Servlm 3 M Center, Building 0220-02-E-02 St.Paul. MN 55144-1000 651 733 1773 Fax CertifiedMail, September 8,2003 - Document proctsshlg center EPA East Room 64;8 Attn: Section 8(e) Officeof PollutionPmvention and Toxics US EPA 1200 Pennsylvania A\ enue NW Washington DC 2046~)-OO01 RE: TSCA 8@) StPPLEMENTAL SUBMISSION Docket NO.8EHQ-0602-00373 Dear Docket Coordim.tors: On October 30,2002,3MprovidedEPA with preliminary results from a oral combinedrepeated dow toxicity test with repductivddevelopmmttoxicity scmningtest on perfluorohexanedonate potassium salt (PFHS). The final report for thisstudycontainsresults that are consistentwith the previouslyreported informaton. Enclosed please find the hllowing final report on CD Rom: 0 Oral (Gavage)Combined Repeated Dose Toxicity Study of T-7706with the Repr0ductivd)evelopmentalToxicity SmeningTest Please contactJohnBitenhoff (651-733-1962)ifyou have any questionSor if we can provideadditionali n f b d o n . Sincerely, ~ a r r Jyoh~nson Director, Corporate T~>xicologaynd RegulatoryS d c e s Enclosure , `i ' boc: JChoehrniBKuetd~e C~r CTT&nR&oSRS-h-2w22o02i02--f208i202 i !