AR226-2263 E ID 294463 Current Permlt/Applicatlon/P D F # 1823A 81SD 815D 13S3A P re -E x istin g 614A 614A 781 1653 2365A Note: For some vents the surfactant rate Is less than the total particulate reported In Air Emissions Inventory which can Include polymer dust.

AR226-2403 v INTEROFFICE MEMORANDUM Date; From* Dept; Tel No; 7-JU1-1989 OlS02pm WILLIAM E CRAWLEY CRAWLEWE FPD-#TEFLON',TECH 304-8S3-2742 Howard A.

AR226-2484 C-8 Sump Analysis Sheet Date Time Liquid Sample Solids Sample pH .

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AR226-2529 C-8 DETECTED WASHINGTON WORKS SITE * SUPERNATE POND AREA - CONTAMINATED SOIL - GROUNDWATER (-20 FT) i WEST END OF SITE - WELLS 27 & 4 - GROUNDWATER (-75 FT*) NO. 5 OU TF AL L . - DISCHARGE TO OHIO RIVER WASHINGTON WORKS EMPLOYEES 1991 (VOLUNTARY TESTING) DRINKING WATER (LPSD) 1984 - 1989 1991 LETART LANDFILL SURFACE WATER - LEACHATE POND OVERFLOW GROUNDWATER - WELL SAMPLES DRY RUN LANDFILL SUPERNATE SLUDGE t SURFACE WATER - UPPER POND - SEDIMENTATION BASIN - DISCHARGE STREAM AT PROPERTY LINE GROUNDWATER - MONITOR WELLS *Revised analytical method PPM 100 100 PPB 2-4 40 PPM UP TO 5 PPB 0,7 2,2 3.8* PPM 2-3 0.05 - 0*7 PPM 75-100 2-3 2-3 0*04 - *2 PPB 2-5 RJZOI0004 EID079259

AR226-2578 Laura Waller Document 10 of 16 ASH017 4 91 E1D477528 OHIO RIVER WATER SAMPLING PROPOSAL FOR THE WASHINGTON WORKS FACILITY AND THE LETART LANDFILL Date: February 2002 Project No.: D6WW7423 CORPORATE REM EDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 ASH017492 EID477529 Ohio River W ater Sampling Proposal Table of Contents TABLE OF CONTENTS 1.0 Introduction............,,................................. ................................... ....... ..1 2.0 River Water Sampling Approach Near The Washington Works Facility............... ...3 3.0 River Water Sampling Near the Letart Landfill....................................................... ..5 Table 1 TABLES Proposed River Water Sampling Plan DuPont Washington Works Facility and Letart Landfill Figure 1A Figure 1B Figure 2 FIGURES Proposed Ohio River Water Sampling Locations - Upstream, DuPont Washington Works Facility Proposed Ohio River Water Sampling Locations - Downstream, DuPont Washington Works Facility Proposed Ohio River Water Sampling Locations, Letart Landfill Site rev2rfver.doc Feb. 2 7 ,0 2 Wilmington, DE j A SH 017493 EID47753G Ohio Rivet Water Sampling Proposal Introduction 1.0 INTRODUCTION A multi-media Consent Order (Order No.

AR226-2583 Document 12 of 25 ASH018251 EID521411 I J J C-8 PLUME IDENTIFICATION/GROUNDWATER ASSESSMENT WORK PLAN DUPONT WASHINGTON WORKS FACILITY AND LOCAL, LETART AND DRY RUN LANDFILLS ) Date* May 2002 Project No.; D6WW7423 A CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 a ASH018Z52 EID521412 C-8 Plume Identlfigation/Groundwaier Assessment Work Plan Introduction TABLE OF CONTENTS 1.0 Introduction..................................................... ............,,................................................2 1.1 Document Organization................................................ ................ ..................... 3 2.0 Washington Works Facility................ ........................................................................ 4 2.1 Key Findings................. ............................................... ................ ..................... 4 2.2 Data Gaps................................................................................ ............ ............. 5 2.3 Summary--Recommended Activities to Fill Data Gaps................................... 5 2.4 Detailed Justification..... ....................................... ............................................. 3.0 Local Landfill.... .................................................................................... ....................... g 3.1 Key Findings..................................................................................................... 3.2 Summary-- Recommended Activities to Fill Local Landfill Data Gaps.......... 9 3.3 Detailed Justification........................... ................................................... ..........jq 4.0 Letart Landfill............................................................................................................... 4.1 Key Findings--Letart Landfill....................... .................... .................. ..........12 4.2 Data Gaps for the Letart Landfill...................................................................... 13 4.3 Summary--Recommended Activities to Fill Letart Landfill Data Gaps...... ..13 4.4 Detailed Justification ..................................................................................14 5.0 Dry Run Landfill............................................................................................. ........ 16 5.1 Key Findings--Dry Run Landfill......................................................... ........ 16 5.2 Summary--Data Gaps for the Dry Run Landfill............. ................. .........17 5.3 Summary-- Recommended Activities to Fill Dry Run Landfill Data G aps.............................. .................................................................... ........17 5.4 Detailed Justification............................... ............................................. ........17 6.0 Path Forward............................... ......................................... ........................ ....... 20 7.0 References............. ........................................ .. ....... 21 Figure 1 Figure 2 Figure 3 Figure 4 FIGURES Proposed Well Locations for the Washington Works Facility Proposed Well Locations for the Local T.anrfffn Proposed Well Locations for the Letart T^nrtfiit Proposed Well Locations for the Dry Run Tjwrifin APPENDIX Appendix A Sampling and Analysis Plan O-B Plume W ork PlanZrioc May. 20,02 W ilmington.

AR226-2610 SAMPLING INVESTIGATION RESULTS LITTLE HOCKING WATER ASSOCIATION WELL FIELD WASHINGTON COUNTY, OHIO Date; April 2003 Project No,: 7482 18983762.00010 CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 1980S ASH025862 EID779150 ED779150 Sampling Investigation Rsulte Table of Contente TABLE OF CONTENTS Executive Summary................................. 1.0 Introduction........................ . .......... iii ......,,...1 2.0 Environmental Setting.................... 2.1 Geology............................ ...... 2.2 Hydrogeology........................ . .....3 ............ 3 4 3.0 Sampling Approach............................. .................. . ....5 4.0 Groundwater Sample Results........................... ............................... 4.1 C-8 in Groundwater from Temporary Borings...................... 4.2 C-8 in Groundwater from Production and Test W ells........... 4.3 Groundwater Elevations in Production and Test Wells and Ohio River Stage., ....6 ....6 ....6 ......8 5.0 Soil Sample Results.................................................... ....9 6.0 Site Conceptual Model........... .............................................. 6.1 Geology...................................... ............................ 6.2 Hydrogeology................................. ................ ............. 6.3 C-8 Transport Mechanisms and Migration Pathways. ..10 ..10 ..10 ,,11 7.0 Conclusions and Recommendations ..................................... .................. 13 8.0 References.............................................................................. .................. 15 Table 1 /Table 2 Table 3 Table 4 TABLES C-8 in Groundwater from Temporary Borings ' C-8 in Production and Test Wells Groundwater Elevation Data for Production and Test Wells August 21, 2002 C-8 in Soil from Temporary Borings L.HSIreportl Apf. 17.03 Wilmington, DE f ASB025863 EID779151 EID779151 Sampling Investigation Results Table of Contents Figure t Figure 2 Figure 3 Figure 4 Figures Figure 6 Figure 7 Figure 8 Figure?

RECYCLED o> AR226-2684 AR226-2684 The miracles o f science' Study Title ADSORPTION-DESORPTION SCREENING STUDIES OF AMMONIUM PERFLUOROOCTANOATE Author William R.

RECYCLEO CD / AR226-2694 AR226-2694 DuPont EMSE Report No. 17-03 Study Title Adsorption/Desorption of Ammonium Perfluorooctanoate to Soil (OECD 106) Test Guideline(s) OECD 106 Guidelines for the Testing o f Chemicals; Adsorption-Desorption Using a Batch Equilibrium Method (January 21,2000) A u th o r Lynn Ann Dekleva Study Completion Date 17-April-2003 Test Facility E.I. du Pont de Nemours and Company Central Research & Development Corporate Center for Engineering Research Environmental and Microbiological Sciences & Engineering Glasgow Building 300, P.O.

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AR226-2787 FOR D PONT USE ONLY E.

.Company Sanitized.

FOR D PONT USE ONLY AR226-2891 Copies Co E.

A R 226-3117 ^ 3 p |||. '.!''"