30 June 2003 To: Mary F.

BACK TO MAIN FETAX - FROG EMBRYO TERATOGENESIS ASSAY - XENOPUS TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS, U2723 or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: Sample obtained from 3M production lot number 217.

oruns tr REVIEWOF PROLIFERATIVE LESIONSOFTHE EXOCRINE PANCREASIN "TWO CHRONIC FEEDING STUDIES IN RATSWITHAMMONIUM [PERFLUOROOCTANOATE Steven R.

AR226-2102 Te^fiesHte .....^...j^aws-.

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AR226-2189 08/24/2001 03:59 PM To: UK.

AR226-2199 Chris E Shoop 09/05/2001 11:16 AIVI ..,,.__ _ _ To: Debbie J Mulrooney/AE/DuPont@DuPont cc: Stephen J Gissy/AE/DuPont@DuPont, Robert L Ritchey/CL/DuPont@DuPont, Robert F Pinchot/DEV/AE/DuPont@DuPont, M.Ann BradIey/STB/DUP@DUP, Roger J Zipfel/AE/DuPont@DuPont Subject: Revised Modeling Parameters DuPont Confidential Prepared at the Request of Counsel Attorney Client Communication Attorney Work Product Prepared in Anticipation of Litigation Debbie, Please see ihe attached file and use this for the update to the information provided to Mr.

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AR226-2306 y Charles J Zarzeckj 03/03/2003 01:1S PM To: cc: Subject: Catherine A Barton/AE/DuPont Re: C8 meeting D Cathy, Yes, they can be done. however, not until Wednesday as I am on my way out the door to Front Royal.

AR226-2352 W "ss^S^ MONITORING PROPOSAL FOR FLUOROPOLYMER MANUFACTURING SITES PRESENTATION TO THE FLUOROPOLYMER TECHNICAL WORKGROUP s "o 0 0 0 ro January 15,2004 M 09 AGENDA Introduction Proposal on Monitoring Site Specific Monitoring Plans Decatur, AL 3M and Dyneon Parkersburg, WV Summary Recommendation for Path Forward Daikin Monitoring Plan INTRODUCTION Industry Commitment to Site Monitoring Importance of Addressing Data Needs Suggestion of a Tiered or Phased Approach ...-7 INTRODUCTION (continued) Value of a Tiered or Phased Approach Science-based (first phases inform later ph More effective More timely Contextual Data Collection Incorporates All Monitoring Commitments Program to have Transparency S Data Review, Informed Decision Making, -0 0 0 Technical Expert Collaboration 0 1M LO e?

AR226-2485 Walter R long 10/08/2001 10:38 AM To: cc: Subject: Ta-Wei Fu/SBDuPont@DuPont Takuya.ichida@daikin.co.jp, Satoshi_komatsu@notes.che.daikin.co.jp, Charles J Noelke/AE/DuPont@DuPont, Steven H Swearingen/AE/DuPont@DuPont, Katsunosuke Kitagawa/PO/DuPont@DuPont, Nancy L Tanzola/AE/DuPont@DuPont, David R Wallace/AE/DuPont@DuPont, Shawn E Messmger/AE/DuPont@DuPont Re: PROPOSED APFO SPECIFICATIONS Q How does this list compare with the FAX that Daikin sent?

AR226-2509 9 Stephen R Peck 03/07/2002 08:21 PM To: cc: Subject: Yasu Snibuta/SE/DuPon1@DuPont Ta-Wei Fu/SE/DuPont@DuPont, Mohammad Rezaei/SE/DuPont@DuPont Procedure for Analytical Determination of APFO Prnr.p.ritirB for Analvtinal DRtfrminatinr EDD0042621

- r= PATTON BOGGS. 4) ATTORNLETOYSW ARR26_ 355 a wn December 20, 2004 AR 224 bic ad Proberuon@pstonboggs com Me.

NORTHERN KENTUCKY SUITE 340 OFFICE 1717 DIXIE HIGHWAY COVINGTON, KENTUCKY 41011-4704 606-331-2838 513-381-2838 FAX: 513-381-6613 DAYTON, OHIO OFFICE I - SUITE 900 110 NORTH MAIN STREET DAYTON, OHIO 45402-1786 937-228-2838 FAX: 937-228-2816 ROBERT A.

COVAW'C-E-'-*'\ THE DEVELOPMENT SERVICES COMPANY Sponsor: 3M St.Paul,Ntinnesota FINAL REPORT Study Title: 13-Week DietaryToxicityStudywithN-Methyl Perfluorooctanesulfonamido Ethanol(N-MeFOSE, T-6314)inRats Author: PeterJ.Thomford, PhD Study Completion Date: June 30,2000 PerformingLaboratory: Covance LaboratoriesInc. 3301 Kinsman Boulevard Madison,Wisconsin 53704-2595 LaboratoryStudy Identification: Covance 6329-225 Sponsor Study Identification: StudyNo. 3M T-6314.1 Page I of560 QUALITY ASSURANCE STATEmyNT Covance 6329-225 3M T-6314.1 Thisreport,withtheexceptionofAppendix 7,hasbeenreviewedby theQuality Assurance Unit of Covance LaboratoriesInc.