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TABLE OF CONTENTS <br /> is EXECUTIVE SUMMARY ES-1 <br /> 10 INTRODUCTION . . 1-1 <br /> 11 Background on Risk Assessment 1-2 <br /> 1.2 The LUFT Evaluation . . . . 1-5 <br /> 13 Report Organization . . 1-7 <br /> 20 SITE CHARACTERIZATION 2-1 <br /> 21 Site Background . . . 2-1 <br /> 22 Site Geology/Hydrology . . . 2-1 <br /> 23 Summary of Previous Investigations 2-3 <br /> 2.31 Soil Investigations 2-3 <br /> 2 3 2 Groundwater Investigations 2-11 <br /> 24 Selection of Study Area 2-13 <br /> 3.0 SELECTION OF INDICATOR CHEMICALS 3-1 <br /> 40 EXPOSURE ASSESSMENT . . . . 4-1 <br /> 41 Exposure Assessment Process 4-1 <br /> 4.2 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*M1-mmffAFE FNLImW 26 93 ChwnRui& 1993 <br />