AR226-2094 Test Results Sample Date Range Concentration Range AcHon Level Industrial 1/1/90 100% Sample Ot Sample Duration type Employee Name BTO; 08 IfiC: 701 TEFION FINE POWDER DRYER-EAST SIDEtfa: 1BO 8747 405 A 12(31/90 Pers Chemical 0.8/FC-143 BTO: 08 LOC; 702 TEFLON PINE POWDER DRYER CONTROL ROOM (ALSO SEE TTF081 1QSQ 294 3S6 A &a/FC-143 2/1460 320 2/14SO 3Z3 418 A 374 A C-WO-143 C-8/FC-143 3/1200 369 360 A C-e/FC-143 7/11/90 509 480 A CWC-143 BTO; 03 LOC: 703 TEFUON PIME POWDER PACKOUT ROOM 1/10(90 15515 355 P 7/1WO 611 480 A 8/10CO 638 330 A 09PJ C.WPC.143 &WC-143 &8fl;:C.143 BTO; 08 LOC: 704 TePLON A/8-FIM6 POWDER (>SWBQH HOOD 2/14BO 322 383 A 3/12(90 368 360 A BTO; 08 LOC; 706 TEPLOM DISPERSION PACK OUTAREA OBOOS-O 480 A BTO: 08 LOC: 708 TEFLON FINE POWDER DRYER S3 1/10(90 297 365 A 2/14(50 321 387 A Cfl/FC-143 C-WC-143 C.aPC-143 C-8/FC-143 C-8/F-C-143 BTO; 08 TEPLOM LOC!

AR226-2259 /y Debbie J Mulrooney 02/20/200212:47 PM To: cc: Subject: Todd M Krieger/AE/DuPont@DuPont Steven H Swearingen/AE/DuPont@DuPont, Robert F Pincnot/DEWAE/DuPont@DuPont Re: Environmental Impact Study Q The new stack height is much higher than what we modeled (85 vs. 55 ft) and the new flow rate is also much higher (12,400 scfm vs. 4710 scfm). since these two changes will both improve dispersion, not make it worse, I'm not sure that there is really a reason to revise the modeling and the report.

AR226-2341 FL^oP^M^S.

SITE SCREENING LEVEL ASSESSMENTS FOR PFOA AND THE RELEVANCE OF SOIL SAMPLING Date: OctobertO, 2003 Project No,; 18983753.00034 ^ CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 EXP001453 SHe Screera'ng Level Assessments for PFOA and the Relevance of Soa Sampling Table of Contents TABLE OF CONTENTS Executive Summary. 1.0 Introduction ..... 2.0 Data Presentation................................................................................................ 2.1 Development of a Generalized PFOA Screening Level Site Conceptual Model...............,................................................................................................3 2.2 Laboratory Studies of PFOA and Field Sample Verification........................... 4 2.2.1 The Behavior of PFOA in Water......................................................... 5 2.2.2 Adsorption/Desorption of Ammonium Perfluorooctanoate to 2.2.3 2.2.4 Soil.......................................................................................................5 Little Hocking Water Association Investigation Results..................... 7 Washington Works RFI Soil Sampling Results................................... 8 3.0 Summary... .10 4.0 References. .11 Table I 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 of 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 Site Screening Level Assessments for PTOA and the Relevance of SoB Sampling _____EXCCUtlVe Summary EXECUTIVE SUMMARY DuPont's extensive implementation of 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 of a generalized screening level assessment model.

AR226-2559 FILE No. 864 08/01 '01 13:01 ir>;DUDUPONTWILD. -8085-2 ' ^(SY * 123 * A 302 774 6474 07/30/01 (WE 2 16:03 0:02/08 N0;962 I.t^lwtf,1 VIW/ N^rt^ UNmro <TAT1(I ENVWROMNMIWNlMirTPARtO.

RECYCLED t.^1 AR226-2624 INS AR226-2624 JULY 2004 PFOA SAMPLING DUPONT CIRCLEVILLE WORKS CIRCLEVILLE, OHIO Date: August 2004 Project No.: 18984003.04005 CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 July 2004 PFOA Sampling Introduction On July 8,2004, groundwater was sampled from two recovery wells and three production wells at the DuPont Circleville Plant.

AR226-2670 0 DuPont Legal Andrea V.

Copies to: E.

AR226-2978 Du Font HLR 477-92 TRADE SECRET Study Title STATIC, ACUTE, 96-HOUR L.C5Q OF H-19,173 TO FATHEAD MINNOWS.

AR226-3143 TRADE SECRET Study Title H-24256: Oral Approximate Lethal Dose (ALD) in Rats Laboratory Project ID: DuPont-3628 AUTHOR: Carol Finlay, B.A.

AR 246 _ 3277 481 R226. 3297 Duron 15308 ~.

AR226-3380 SSS^SSSSWSWS^S^^wwaw'iw.

Larry IL Zobel,MD, MTH StaffVice President and Medical Director 3M MedicalDepartinent 3M Center,Building220-2E-02 PO Box 33220 St.Paul,MN 55133-3220 651733 5181 Office 651733 5152 Facsiiy@le April25,2000 Dr.

FC-95/PhotolysisStudy Using SimulatedSunlight.

DraftReport 26-Week Capsule ToxicityStudy with PerfluorooctanSeulfonic Acid PotassiumSalt(PFOS; T-6295) in Cynomolgus Monkeys PREPAMD FOP, 3M COVANCE STUDY NUMBEP6329-223 VOLUME IOfn COVAW'C-E.-"'\ IM DEWSLOPMIWT SEMCU COMPANY Sponsor. 3M St.PauL Minnesota UNAUDrrED DRAFR April12,2000 FINAL REPORT Study Tide: 26-Week CapsuleToxicityStudywithPerfluorooctanSeulfonicAcid PotassiumSalt(PFOS; T-6295) inCynomolgus Monkeys Author.