ATSttCn:A SDeocctuiomne8n(et)P/FroYcIessing Center Attachment 1 P-1 P-1 July 28,2006 Page 4 of 5 M Z26 _373J- Acronym codefor Tables 1 and 2 In Tables 1 and 2, the following acronyms are used: acronym meaning CW FW WW DuPont Chambers Works facility in Deepwater, New Jersey DuPont Fayetteville Works facility in Fayetteville, North Carolina DuPont Washington Works facility in Parkersburg, West Virginia PPPFFFHPBeAxAA PFHpA PPPPFFFFOUDNnAAAA PFDoA PFBS PPPFFFOHOSxSSA PPeerrfflluuoorroobpuentatannooicicaacicdid Perfluorohexanoic acid Perfluoroheptanoic acid Perfluorooctanoic acid Perfluorononanoic acid Perfluorodecanoic acid Perfluorotmdecanoic acid PPPeeerrrfffllluuuooorrrooobhdueoxtdaaennceaenssuoulilfcfooanncaaitdtee Perfluorooctane sulfonate Perfluorooctane sulfonamide Attachment 1 Spaed Matrix Lab Blank 1 cw # P % cw p 3 cw n m 34 CW (DUPLICATE) c w v 5 cw i cw < P * CW 7 cw qp ( CW WG18817-102 Y2 WG18817-101 Y1 L8789-1 Y1 LB789-2 Y1 L87B9-3 Y1 WG18817-103Y1 L8789-4 Y1 L8789-5 Y1 LB789-5 Y1 LB789-6 Y1 L8789-7 Y1 L8789-8 Y1 % Recovery ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL ng/mL WQ18817 W Q 18817 WQ18817 WQ18817 WG18817 WG18817 WG18817 WG18817 WG18817 WG18817 WG18817 WG18817 PFBA 81.2 ND ND ND ND ND ND <1.44 <1.44 <1.44 NO ND PFPeA 79.0 ND ND ND ND ND ND ND NO ND ND ND PFHxA 85.8 ND 1.82 ND <0.900 <0.900 ND ND ND <0.900 ND <0.900 PFHpA 83.5 ND ND ND ND ND <1.41 3.71 3.71 11.7 6.91 ND PFO A 110 ND 7.71 9.72 24.1 21.6 42.8 13.4 13.4 111 56.7 26.6 PFNA 11B ND 4.28 2.90 7.10 6.78 18.3 4.22 4.22 53.1 29.2 2.37 PFDA 115 ND <1.06 <1.08 1.64 1.51 8.47 1.82 1.82 13.5 7.47 <1.08 PFUnA 128 ND <1.02 <1.02 2.37 2.60 1.70 <1.02 <1.02 3.99 1.55 ND PFDoA 60.9 ND ND ND <0.600 <0 600 0.943 <0.600 <0.600 1.10 0.737 ND PFBS 94.8 ND ND ND ND ND ND ND ND ND ND ND PFHxS 104 ND <3.72 <3.72 39.1 33.5 <3.72 <3.72 <3.72 4.28 <3.72 3.81 PFOS 112 ND 51.1 35.3 68.2 58.0 25.7 35.0 36.0 39.0 53.8 36.8 PFO SA 73.5 ND ND ND ND ND ND ND ND NO ND ND Attachment 1 PFBA PFPeA PFHxA PFHpA PFOA PFNA PFDA PFUnA PFDoA PFBS PFHxS PFOS PFOSA tp // CW ^ k F w t f f lV L8789-9 Y1 LS789-10Y1 L8789-11 Y1 ngftnL ngAnL WG1B817 WG18817 ngAmL WG18817 ND ND NO ND ND ND ND ND ND NO 1.48 ND 12.9 13.0 28.3 <1.53 3.97 2.28 ND <1.08 <1.08 ND <1.02 <1.02 ND ND ND ND ND ND <3.72 <3.72 6.64 30.7 46.9 37.2 ND ND ND t-2.

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Taft/ Taft Stettinius & Hollister LLP 425 Walnut Street, Suite 1800 /Cincinnati, Ohio 45202-3957 /Tel: 513.381.2838 / Fax: 513.381.0205 / www.taftlaw.com Cincinnati /Columbus /Cleveland /Dayton /Covington /Phoenix Robert A.

3M General Offices 3M Center St.

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460 MG 8 2000 Mr.

H18636: Slide Review of pancreas lesions from DuPont APFO Study Date of Review: 28thNovember 2001-11-29 Reviewing Pathologists: Dr E E McConnell and Dr J R Foster Study No: HN-18636 Study Tide: Combined Chronic Toxicity/Oncogenicity Study with Linur-on, C8 and Wyl4,643.

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AR226-2048 / / Ta-Wei Fu 07/30/2001 08:01 AM .

AR226-2162 H David Ramsey ' 07/16/2001 11:02 AM To: Dawn D Jackson/CL/DuPont@DuPont, George A Ainsley/SE/DuPont@DuPont cc: Subject: FW: Call From Jesse Flanshaw Three key notes - there are some of us who prefer the State and 1both conduct modeling so it is more independent -------------------------------Forwarded by H David Ramsey/SE/DuPont on 07/16/2001 11:01 AM John J Mentink 07/10/2001 08:30:49 AM To: H David Ramsey/AE/DuPont@DuPont cc: Subject: FW: Call From Jesse Hanshaw This is the note originally issued by Chris Shoop.

AR226-2183 ,,G Debbie J M ulrooney |... 08/22/2001 02:51 PM < To: Catherine A Barton/AE/DuPont@DuPont cc: Subject: Fayetteville Report Cathie, Rob noted that we left a space for particle size information, but neglected to actually include the information.

AR226-2218 Chris E Shoop 11/29/2001 09:06 AM To: Debbie J Mulrooney/AE/DuPont@DuPont cc: Subject: Re: Revised Spreadsheet O Debbie, The semiworks facility has been operating since long before the permitting regulations were in place.

AR226-2309 ^ Mark C Hause 03/12/2003 04:25 PM To: David M Rurak/AE/DuPont@DuPont cc: Catherine A Barton/AE/DuPont@DuPont, Charles J Zarzecki/AE/DuPont@DuPont Subject: ISC Model Dave, Per our discussion, I have spoken with Cathie on the need to investigate the model and its validity for 1 and 8 hour periods.