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AR 2.2.6 0 6 0 6 RECEIVED n n n t UTtr <SJi> DuPont Haskell Laboratory for Toxicology and Industrial Medicine July 6,2000 Mr.

AR226-2169 k, Robert L Ritchey r 07/27/2001 03:43 PM To: Chris E Shoop/AE/DuPont@DuPont, Karl G Kronberg/AE/DuPont@DuPont, Debbie J Wlulrooney/AE/DuPont@DuPont cc: Stephen J Gissy/AE/DuPont@DuPont, David F Altman/SE/DuPont@DuPont, Andrea V Mallnowski/AE/DuPont@DuPont, Robert F Pinchot/DEV/AE/DuPont@DuPont Subject: DuPont Washington Works Model Input Files Chris and Kart, I guarantee a check by Hanshaw against permit applications re: stack flows and velocities.

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.

AR226-2243 ( j?

SITE SCREENING LEVEL ASSESSMENTS FOR PFOA AND THE RELEVANCE OF SOIL SAMPLING Date: O ctober20,2003 Project No.: 18983753.00034 CO RPO RATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 EXP001453 Site Screening Level Assessm ents for P FO A and the R elevance of Soil Sampling Table of Contents TABLE OF CONTENTS Executive Summary............................................................................................ 1.0 Introduction.................................................................................................................. 1 OO U* U ^ 2.0 Data Presentation..................... 2.1 Development o f a Generalized PFOA Screening Level Site Conceptual M odel........................................................................................................ 2.2 Laboratory Studies o f PFOA and Field Sample Verification................. 2.2.1 TTie Behavior o f PFOA in W ater.... ........................................... 2.2.2 Adsorption/Desorption o f Ammonium Perfluorooctanoate to Soil............................................................................................... 2.2.3 Little Hocking Water Association Investigation Results........... 2.2.4 Washington Works RFI Soil Sampling Results.......................... 3 3.0 Summary............................................................ ...................................................... io 4.0 References................................................................................................................. 11 Table 1 Table 2 Table 3 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 TABLES Washington Works RFI Soil PFOA Results Washington Works RFI Surface Soil PFOA Results Washington Works RFI ADP SWMU Soil PFOA Results FIGURES PFOA Screening Level Assessment Model Comparison o f K ^'s for PFOA and Other Chemicals Little Hocking Water Association Well Field Soil PFOA Results Washington Works RFI Soil PFOA Results Washington Works RFI Surface Soil PFOA Results Washington Works RFI ADP SWMU Soil PFOA Results soil position paper4.doc Oct. 20, 03 Wilmington, DE EXP001454 I Site Screening Level A ssessm ents for PFO A and the Relevance of Soil Sampling Executive Summary EXECUTIVE SUMMARY DuPont's extensive implementation o f both media specific assessment modeling tools and comprehensive on-site and off-site soil, surface-water, and groundwater monitoring for perfluorooctanoate1at the Washington Works site in West Virginia allowed for compilation o f a generalized screening level assessment model.

Investigation Results Report2.wpd AR226-2348 Page 11 October 2 3 ,2 0 0 3 Mr.

JEB. 26.2002 9:34AM afWSBtoiocte. lesam eovemmoni Center 12HQ.

Dupont Fluoroproducts AR226-2612 Chestnut Run Plaza P. 0 .

HM6 .

January 23, 2006 p ' f cP~7 E2- 0 E2 RECEIVED 0 P T CER OS JAN 2t AN i j , p j gm s.

AR Consultation Meeting on PFCA Action Plan February 2006 1 r 00033 Background Assessment reports completed mid 2004 New related science is being published at a high rate EC & HC using two processes to achieve a current view of the science External review of assessment reports Review of current literature 2 000034 p to ffllP 14>| !

SEVERN TRENT LABORATORIES ANALYTICAL REPORT JOB NUMBER: 244404 Prepared For: Weston Solutions, Inc. 1400 Weston Way Building 5-2 West Chester, PA 19380-1499 Project: Confidential Decatur - FC Investigation Attention: Jai Kesari Date: 02/28/2006 Signature Name: Richard C.

AR226-1519 30 September 2003 To: Mary F.

SSo . e 3M Gammon aScmaiineestato P2030 September 5, 2001 8E-H09R 01 -- 0273 .