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TABLE OF CONTENTS <br /> EXECUTIVE SUMMARY . . . . . . ES-1 <br /> 10 INTRODUCTION . . . . . . . . 1-1 <br /> 1.1 Background on Risk Assessment . . 1-2 <br /> 1.2 The LUFT Evaluation 1-5 <br /> 1.3 Report Organization 1-7 <br /> 2.0 SITE CHARACTERIZATION . . . . . 2-1 <br /> 2.1 Site Background 2-1 <br /> 2.2 Site Geology/Hydrology . . 2-1 <br /> 2.3 Summary of Previous Investigations 2-3 <br /> 2 3 1 Soil Investigations 2-3 <br /> 2 3 2 Groundwater Investigations 2-11 <br /> 24 Selection of Study Area 2-13 <br /> 30 SELECTION OF INDICATOR CHEMICALS 3-1 <br /> 40 EXPOSURE ASSESSMENT 4-1 <br /> 41 Exposure Assessment Process . . . . 4-1 <br /> 42 Exposure Pathways 4-3 <br /> 43 Evaluation of Potential Exposure Pathways 4-3 <br /> 4 3 1 Direct Contact with Diesel Fuel 4-4 <br /> 4 3 2 Inhalation of Diesel Fuel Vapors 4-4 <br /> 4 3.3 Migration to Groundwater 4-4 <br /> 44 Evaluation of Exposure Point Concentrations 4-4 <br /> 4.4.1 Modeling Strategy . . . 4-5 <br /> 4.4.2 SESOIL Modeling . . 4-6 <br /> 4.5 Exposure Assessment Summary 4-15 <br /> 50 RISK CHARACTERIZATION . . 5-1 <br /> 51 Uncertainty Analysis . . 5-1 <br /> 60 CONCLUSIONS 6-1 <br /> 70 REFERENCES . . . . . , . 7-1 <br /> G WWi7%sAN'CAFE FNLMm*5 26 93 ChWIRWk-, 1993 <br />