off AR 226 _ 1054 MR# FAT 4] Bada DuPont Chemical Solutions Enterprise September 24, 2001 Karen Lannon UD.oSc.uEmPeAn,t OCoPnPtrToSl Center 401M Street, S.W.

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Date: Sat, 30 Aug 2003 07:17:34 -0500 "To: Charlie Auer,stevejohnson@epamail.cgpao.v ~From: rich purdy <rpurdy@pressenter.com> >Subject: postponing of risk assessment.

BACK TO MAIN WATER SOLUBILITY IN NATURAL SEAWATER AND 3.5% SODIUM CHLORIDE SOLUTION - SHAKE FLASK METHOD TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test substance is a white powder.

Sponsor: 3M St.

: BCiaclaennidaalrRYeepaorrt20fo03EmissionsofPFOA DuPont - Washington Works Ar2 Page 10f2 /8 Biennial Report for Emissions of PFOA DuPoCnatle-nWdaasrhYienagrto2n00W3orks aNontdel:orTmhoediifnifcoartmiaotni.on containeind this document is submittedvoluntarilyandmay be subject tofuture revision o`TfhiIsntreenptor(tLOisI)sutbomSittteepdhepnurLs. uJaonhtntsoonc,omAmssiitsmteannttsAdmmaindiestbryatDourP,oUnStEiPnAa,Meanrticthled14", V2o0l0u3n,taLreytter Actions to Evaluate and Control More specifically, in accordance Emissions of Ammonium with commitments under Perfluorooctanoate (APFO).

AR226-2108 Test Results Industrial jHygiene Sample Date Range Concentration Range 1/1<81 1231/81 Action Leviil 100% ' Sample Dt Sampled Duration Type Employee Name Pers Cheinica!

AR226-2208 / Roger J Zipfel 11/02/2001 11:17 AM To: cc: Subject Robert F Pinchot/DEV/AE/DuPont@DuPont Debbie J Mulrooney/AE/DuPort@DuPont Re: C8 Particle Density D Debbie, I don't realty understand what you are asking for.

AR226-2218 c.h"SE-sh^p-11/-29000'1 "^p6 AM To: cc: Subject: Oebbie J Miilrooney/AE/DuPont@DuPont Re: Revised Spreadsheet [j Debbie, The semiworks facility has been operating since long before the permitting regulations were in place.

jW^^vesti^atiqnResults Report2.wpd AR226-2348 October 23,2003 Mr.

AR226-3363 Society of Environmental Toxicology & Chemistry Summary of DuPont Presentations North American World Congress November 13-18, 2004 Portland, OR Biotransformation of "C-labeled Fluorotelomer substances by microorganisms from activated sludge or soil.

3M SpecialtyMaterials May 23,2000 3M Center St.Paul,MN 55144-1000 651733 1100 Dr.CharlesAuer,Director Chemical ControlDivision OfficeofPollutionPreventionand Toxics UnitedStatesEnvironmentalProtectioAngency 401 M StreetS,outhwest Room 403,EastTower (MailCode 7405) Washington,D.C. 20460 Re: Informationon PerfluorooetanSeulfonates and RelatedCompounds - AdditionalInformation Dear Charlie: Iam enclosingadditionailnformationthatdidnotgetsubmittedwiththerecentMay 18,2000 submittaltoyou on perfluorooctanseulfonateasnd relatedcompounds.

ATTACHMENT TO LETTER TO C.AUER DATED AUGUST 31,2000 SUPPLEMENTAL SUBMISSION N-ETFOSA N-ethylperfluorooctanesulfonamide AcuteToxicit 1.