' 3M Specialty Materials Fil-W ' /37S3M Center St.

3M General Offices 3M Center St.

<fpp> A t ZZ&-I88S Distribution of Serum PFOA Levels By Current Work Assignment Work Assignment Teflon SerumPFOA (ppm) Number in Median Group 259 0.494 Min 0.0174 Max 9.55 Research/Technical 160 Never assigned to Teflon 342 0.176 0.114 0.0081 2.07 0.0046 0.963 Assigned to Teflon at some point 264 Total Participants 1025 0.195 0.0086 2.59

SRPT T-6295.8, T-6889.1, T-6316.4 DTI 5-A A Z226-oQ - 3M MEDICAL DEPARTMENT, CORPORATE TOXICOLOGY Title: Inter-Species Comparison of Mechanisms Fluorochemical Toxicity following Intraperitoneal dosing of perfluorooctanesulfonate (PFOS, T-6295) or ammonium perfluorooctanoate (APFO, T-6889) in Rats and Guinea Pigs and oral dosing of N-ethyl perfluorooctanesulfonamido ethanol (N-EtFOSE, T-6316) in Rats.

TestResults AR226-2118 r!

AR226-2250 W atershed Particulate P h ase Total W et Dry D eposition D eposition Deposition la /v rt 1q / v r l <o/vr) Vapor Phase W et D eposition (q/vr) Total Total ia/vr) (Ib/vr) Little H ockin g 19449 12433 6966 1642 21091 46.5 Lake W ashington 2686 303 1883 364 3050 6.7 Ohio River 103942 70395 33547 11612 115554 254.7 EDD0068238

% DuPont Modeling Methodology and Results D ebbie M ulrooney D uPont E ngineering T e c h n o lo g y A pril 2 4 , 2 0 0 2 AR226-2279 Modeling Methodology EPA's Industrial Source Complex 3 (ISC3) Model i Followed procedures In EPA's Guideline on Air Quality Models (Appendix W) BPIP model to evaluate building downwash effects CtisfJ Terrain elevations imported from USGS electronic file Receptor grid with 100-meter spacing 5n-site met data (1996) 2-fi>r J.Y fi't/J - quip W- Modeling Inputs a?.

WASHINGTON WORKS TEFLON POLYMERS BUSINESS TEAM cc: *. u. ipiei AR226-2389 September 20, 1985 TO: 0.

AR226-2404 INTEROFFICE MEMORANDUM Date] From: Depts Tel No : 30-Aug-1989 02:59pm ANTHONY J.

AR226-2489 DuPom Washington Works P.0-.Bos':2!

AR226-2601 om < CN r- <N CD <OD ASH02B045 EXD781325 EID781325 i i Objectives Provide grounding/update on recent activities Solicit input on upcoming activities mg M H otv> 09 O cn EID781326 : Agenda Water - GIST Final Report Recommendations - Proposed MOU Based on GIST Recommendations - OEPA Requests - DuPont Suggested Modifications Air - Review Recent Model Results - Air Permit Update - Additional Reduction Programs - Air Model Verification Plan ASHQ2B047 Proposed Memorandum of Understanding-W est Virginia DEP and Ohio EPA Sas W H a-a CD H UND) GO aN3 WoCD aH a CO H UIO) CO Summary of Activities December 2, 2003 S MOH a-oej, H WHa"J *o N*U0J) GO CNOJ 10' GIST Report Recommendations Summary Final GIST report issued August, 2003 Continued quarterly/annual monitoring of certain Ohio River public water systems Quarterly/annual monitoring of private water supplies (10 locations) in West Virginia and Ohio - West Virginia: Wash Works 0-2 mile radius and Dry Run Landfill/Letart Landfill I-mile radius - Ohio: Wash Works 0-2 mile radius - List to include wells, springs, cisterns Conduct C8 monitoring at all DuPont Washington Works facilities according to applicable West Virginia Solid Waste/NPDES, NPDES, and EPA HSWA (Corrective Action) permit requirements EID781330 i s w H aoK9 03 O cn o Proposed MOU inistrative Details Parties: -- West Virginia Department of Environmental Protection -- West Virginia Department of Health and Human Resources -- Ohio Environmental Protection Agency -- E.L du Pont de Nemours & Company Objectives: -- Continued monitoring and reporting of C8 concentrations in groundwater and surface water -- Implement recommendations of the GIST concerning continued sampling and monitoring in WV & Ohio ("in and around the facilities") -- Begin first quarter 2004 Proposed MOU -Public Water System Sampling WV Public W ater Systems: - Quarterly sampling 1Q20G4-4Q2OO5 at Lubeck PSD, DuPont WW, and GE production wells and finished water (if applicable) - Annual sampling 2004-2005 at Blennerhassett Island State Park, Mason Cty.

AR226-2655 AR226-2655 ISC Modeling Methodology and Results Introduction This report summarizes dispersion modeling that was completed for the DuPont Washington Works facility to demonstrate that the emission limits included in the form R13 permits (815E, 1353B, 1953B, and 2365C) comply with the C-8 assessment o f toxicity (CAT) recommended airborne screening level of 1.0 ug/m3 at the property line fence.

RECYCLED Ul co AR226-2663 Proven Results.

AR226-2783 FOR DO PONT QSE ONLY H askell LaEb.orZa.toEdruly:fP:iooamnrnrtkRTd,ooaaxDdiNc,eoleaPlmow.ogauOyrre.sanBadn1o9dx7I1n5C10do,u.

Study Sponsor: ELF ATOCHEM Issue Date: 18-Jaa-94 Document Reference No.: ] 43833A AR226-2999 - Ready Biodegradability Study (OECD 301B) Author(s): J.C.