BACK TO MAIN TOXICITY TO AQUATIC PLANTS (Duckweed, Lemna gibba G3) TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: Sample obtained from 3M production lot number 217.

BACK TO MAIN ACUTE ORAL TOXICITY TO TERRESTRIAL INVERTEBRATES (HONEY BEE) TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks field: The 3M production lot number was 217.

BACK TO MAIN MICROBIAL RESPIRATION INHIBITION TEST TEST SUBSTANCE Identity: Decafluoro(pentafluoroethyl)cyclohexanesulfonate, DEA salt; may be referred to as CS-2070.

Sponsor: 3M St.

AR226-1898 oT9m515FR 3M MEDICAL DEPARTMENT, CORPORATE TOXICOLOGY Low Level Oral Perfluorooctanesulfonate (PEOS) Dose Toxicokinetic Study `Serum and Liver PFOS in Rats: DateF:inAaplriRlep1o4r,t2004 Study No.

rSRiPsTaT6295, T-6889.1, T6316.4 AR226- 190 3M MEDICAL DEPARTMENT, CORPORATE TOXICOLOGY Title: Inter-Species ComparisonofMechanisms 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.

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AR226-2106 Test Results Sample Date Range Concentration Range Action Level Industrial Hygiene lfl/79 1231/79 100% Sample Dt Sample?

AR226-2143 C-8 EXPOSURE LIMITS AEL IM AIR 0.56 MOLES PER BILLION .01 mg/m3 BLOOD LEVELS UNDER REVIEW PUBLIC EXPOSURE LIMITS DRINKING WATER 5.0 PARTS PER BILLION (GUIDE LEVEL) COMMUNITY EXPOSURE (GUIDELINE) 0.0003 mg/m3 RJZipfel/sbr - 009665-2 - 5/24/88 EXD951520 WASHINGTON VORKS OFF PLANT EMISSIONS WATER AIR PRODUCT OFF-PLANT DISPOSAL POUNDS C-8 1983 1986 21,700 19,100 12,700 16,200 8,000 8,300 7,700 8.300 50,100 51,900 RJZipfcl/sbr - 009665-3 - 5/24/88 EID951521 C-8 ENVIRONMENTAL PROGRAMS FINE POWDER DRYER AIR EMISSIONS REDUCTION SUPERNATE POND ELIMINATION NEGOTIATING PURCHASE OF LUBECK WATER SYSTEM ZONYL* TBS REPLACEMENT FOR C-8 IN FEP * Du Font's KgistTd TrdniKrk RJ2ipl/sbr - 009665-4 - 5/24/88 EID951522

AR226-2358 DRAFT PHASE II MONITORING/SAMPLING WORK PLAN DUPONT WASHINGTON WORKS SITE WASHINGTON, WEST VIRGINIA Date: March 2004 Project No.: 507423 18983990.04006 18983992.04006 CORPORATE REMEDIAT10N GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 EXP000387 Draft Document Do Not Cite or Quote, March 30, 2004 Draft Phase II Monitoring/Sampling Work Plan____ _____ ______Table Of Contents TABLE OF CONTENTS 1.0 1 Introduction....................--...............................--...,........--................--..................... 2.0 Background Information............................................................................................ 3 3.0 Air Modeling Verification Study............................................................................... 5 3.1 Phase II Air Monitoring Activity...................................................................... 5 3.1.1 Air Sampling Events, Duration and Locations.................................... 5 3.1.2 Number of Samples ............................................................................. 5 3.1.3 Sampling Equipment, Methods and Schedule..................................... 6 3.1.4 3.1.5 3.1.6 3.1.7 3.1.8 Analytical Methods..............................................................................6 Meteorological Monitoring.................................................................. 7 Meteorological Data..........................--............................................... 7 Model Selection and Methodology...................................................... 8 Receptor Selection.........--................................................................... 8 3.2 Progress Reports and Results --.........................................................................8 4.0 Water Monitoring Activities...................................................................................... 9 4.1 Private Water Sources..........................;............................................................ 9 4.1.1 West Virginia: GIST Conclusions and Recommendations For 4.1.2 West Virginia Private Water Supply Sources...................................... 9 West Virginia: Private Water Supply Sources Activities.................. 10 4.1.3 Ohio: GIST Conclusions and Recommendations for Ohio Private Water Supply Sources........................................................... 11 4.1.4 Ohio: Private Water Supply Sources Activities................................. 12 4.2 Public Water Sources...................................................................................... 13 4.2.1 West Virginia: GIST Conclusions and Recommendations for 4.2.2 West Virginia Public Water Supply Sources..................................... 13 West Virginia Public Water Supply Sources Activities.................... 13 4.2.3 Ohio: GIST Conclusions and Recommendations for Ohio 4.2.4 4.2.5 Public Water Supply Sources............................................................ 14 Ohio Public Water Supply Sources Activities................................... 14 Ohio: OEPA Recommended Well Installation at Little Hocking Water Association Well Field............................................. 15 5.0 Surface Water and Groundwater Monitoring........................................................... 17 6.0 Surface Soil/Biota (Vegetation) Sampling............................................................... 18 7.0 Schedule and Reporting...................................................................--.---......--...... 20 8.0 21 References.......................................................................................................... 2004WorkPlan4.doc Wilmington, DE EXP000388 I Draft Document Do Not Cite or Quote, March 30, 2004 Draft Phase II Monitoring/Sampling Wori< Plan Table of Contents Table 1 Table 2 Table 3 TABLES, Summary Data for Proposed Sampling Locations In and Around DuPont Washington Works Site Summary of GIST Private Water Source Sampling Recommendations Summary of GIST Public Water Source Sampling Recommendations Figure 1 Figure 1.5 Figure 2 Figure 2A Figure 3 Figure 4 Figure 5 Figure 6 FIGURES Offsite Monitoring Locations Near the Washington Works Facility/Local Landfill in West Virginia and Ohio OVSTube Offsite Monitoring Locations Near the Dry Run Landfill in West Virginia Wind Rose - DuPont Washington Works Offsite Monitoring Locations Near the Letart Landfill in West Virginia Public Water Source Monitoring Locations in West Virginia and Ohio Proposed Locations of the Four Shallow Wells at the Little Hocking Well Field Washington Works MOU Schedule Appendix A APPENDICES Phase II Quality Assurance Project Plan, DuPont Washington Works Site, Washington, West Virginia 2004WorkPlan4.doc Wilmington, DE EXP000389 Draft Document Do Not Cite or Quote, March 30, 2004 Draft Phase II Monitoring/Sampling Wo* Plan ______ ________ Introduction 1.0 INTRODUCTION This Phase n Monitoring/Sampling Work Plan (Work Plan) is referenced as Appendix 5 in a Memorandum of Understanding (MOU) between the United States Environmental Protection Agency (USEPA) and E.

AR226-2362 URS URS Diamond R4^ MoAi-kriAQ rWeA-fct'ti^A ^') -?

AR226-2424 LETART LANDFILL 6ROUNDHATER HONITORINg - SUMMARY Of PC-143* ANALYTICAL RESULTS Sample location Upper Pond Lower Pond Upper Pond Lower Pond Well 1 Well 2A Well 3 Well 3A Wen 4 WeU 5A WeU 5B WeU 8 Upper Pond Lower Pond Upper Pond Lower Pond Well SB Well 5A Well 4 Well 5A Duplicate Upper Pond Lower Pond Well 3 WeU 3A Well 7 Well 1 Well 8 Well 8 Duplicate Well 6 Well 2A Trip Blank Date^Sampled 1/18/91 1/18/91 2/8/91 2/8/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 3/22/91 4/26/91 4/26/91 *11/22/91** 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 11/22/91 FC-143 Result (ug/1) 2,900 1.200 2300 400 60 50 390 380 690 1.6 340 25 500. 340 930 670 380 0.8 830 0.9 790 1,000 1,000 350 O.I 68 280 280 24 63 0,1 * FC-143 Is anrooniua perfluorooGtanoate Ionic surfactant & ** Analyses ptsrforeed bys CHzM mn Quality Analytical Laboratories 2567 Fairlane Avenue Montgomery, AIL 36116 Method Detection UaH O.I ug/1 | Other analyses performed bys Du POnt Experimental Station 141 N Henry Clay Road wnrotngton. 06 19880-0301 Method Detection Unrit 1.0 ug/1 o g 1/31/92 <ji hews 1023 EID1162B4

AR226-2502 OiiTwil W.einifimWuh P !

AR226-2507 COMPILATION OF HISTORICAL C-8 DATA DUPONT WASHINGTON WORKS MAIN PLANT AND LANDFILLS Kate: Jattttiay 2002 Projtct Mo; D6WW7423 h ^ CORPORATC R6MEDIAT1CW GROUP ftnAlSancobetttwin DuPci^ and OfiS DimwntI Bailey Ml PteHi.

AR226-2541 RESPONSETO INFORMATION REQUESTEDREGARDINGAPRIL 1992 VI REPORT (REFERENCE;EPA REGION III LETTER DATED HAY 5, OUPONT WASHINGTONWORKS 1997) WVD045875291 Responses to information requested in the referenced EPA letter are presented below.