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SET ARG-002 3M Identification of Fluorochemicals in Human Tissue `The objeetiveofthis study is to determine the concentration ratios, in humans,ofliver to serum, liver to bile and bile to serum for perfluorooctanesulfonate (PFOS).

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70 PP AR226-1534 DUPONT TELOMER MANUFACTURING SITES: ENVIRONMENTAL ASSESSMENT OF PFOA LEVELS IN AIR AND WATER RECEIVED OPPT NCIC 2003 OCT-15 AM 8:10 Date: September 2003 Project No.: 508501 18983843.00003 CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 DuPont Telomer Manufacturing Sites: Environmental Assessment of PFOA Levels In Air and Water Table of Contents TABLE OF CONTENTS Executive Summary ....................................................................................................... iv 1.0 Introduction............................................................................................................ 1 1.1 Chambers Works ........................................................................................... 1 1.2 Washington Works ........................................................................................ 2 2.0 Data Analysis and Analytical Reporting ................................................................. 3 3.0 Air Dispersion Modeling........................................................................................ 4 3.1 Chambers Works - ISC3 Modeling Methodology and Results ....................... 4 3.1.1 Emission Source Information............................................................ 4 3.1.2 Modeling Methodology .................................................................... 4 3.1.3 Modeling Results.............................................................................. 4 3.2 Washington Works - Screen3 Modeling Methodology and Results................ 6 3.2.1 Data and Modeling Procedures ......................................................... 6 3.2.2 Modeling Results.............................................................................. 8 4.0 Chambers Works Groundwater Sampling............................................................... 9 4.1 Background ................................................................................................... 9 4.2 Regional Geology.......................................................................................... 9 4.3 Site Geology.................................................................................................. 9 4.4 Site Hydrogeology....................................................................................... 10 4.5 Sample Location Selection........................................................................... 11 4.6 Sampling Activities and Results................................................................... 11 4.7 Summary of Results..................................................................................... 12 5.0 Chambers Works Surface Water Sampling ........................................................... 14 5.1 Site Effluent Sample Results........................................................................ 14 5.2 Chambers Works and Upstream Surface Water Intake Results..................... 14 5.3 Delaware River Surface Water Sampling ..................................................... 15 5.3.1 Delaware River - Discussion of Results.......................................... 16 5.4 Salem Canal................................................................................................. 17 5.5 Summary of Results..................................................................................... 17 6.0 Conclusions.......................................................................................................... 18 7.0 References............................................................................................................ 19 EnvironmentalAssessment.doc Oct. 1, 03 i Wilmington, DE DuPont Telomer Manufacturing Sites: Environmental Assessment of PFOA Levels In Air and Water Table of Contents Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 TABLES CATT Established Screening Levels ...................................................... vi Summary of Air Dispersion Modeling Results ....................................... vi Summary of Groundwater Sampling Results-Chambers Works ............. vi Summary of Surface Water Sampling Results-Chambers Works ........... vi Chambers Works Stack Parameters and Emission Rates.......................... 5 Chambers Works Building Heights ......................................................... 5 Chambers Works Site Air Dispersion Modeling Results.......................... 6 Chambers Works Telomers Operations Air Dispersion Modeling Results6 Washington Works GEP Stack Heights................................................... 7 Chambers Work Groundwater Analytical Results ................................. 12 Chambers Works Outfall DSN001 Results............................................ 14 Chambers Works Surface Water Intake Results .................................... 15 Chambers Works Delaware River Sampling, June 9, 2003........................ ..................................................................................

I | & = -------- EL WASHINGTON, D.. 20460 AR286 - 0929 PC UNC September 5, 2000 PrevTeIoTcOorNSrPuismceeTtIoaronncEess ND 3M Company, Inc.