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.

Perfluoropolyether (PFPE) Section I: Personal Information Section II: Zhejiang Chuangfu High Tech New Materials Co., Ltd Section III: General Information Perfluoropolyether (PFPE) is widely used in the fields of chemical, electronic, electrical, mechanical, nuclear engineering, and aerospace due to its high temperature resistance, oxidation resistance, radiation resistance, corrosion resistance and chemical inertness.

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.