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i <br /> CONTENTS Working To Restore Nature <br /> 10 INTRODUCTION 1 <br /> 20 BACKGROUND 2 <br /> i <br /> 30 SCOPE OF PREVIOUS INVESTIGATIONS 3 <br /> 40 SITE CONDITIONS 4 <br /> 41 Regional Geology and Hydrogeology 4 <br /> 1 <br /> 42 Site Geology and Hydrogeology 5 <br /> 43 Distribution of Residual Hydrocarbons 6 <br /> 4 3 1 Residual Hydrocarbons in Tank Pit 6 <br /> 432 Residual Hydrocarbons in Dispenser Area 7 <br /> 44 Distribution of Dissolved Hydrocarbons 7 <br /> 441 Free Hydrocarbons in Ground-Water 7 <br /> 442 Dissolved Hydrocarbons and Selected <br /> Chemicals in Ground-Water 8 <br /> 45 Summary 9 <br /> 50 EVALUATION OF REMEDIAL ALTERNATIVES 10 <br /> 51 Selection Criteria 10 <br /> 52 Soil Remediation Options 10 <br /> 521 Excavation 10 <br /> 522 Vapor Extraction 10 <br /> 53 Ground-Water Remediation Options 11 <br /> 5 3 1 No Action/Monitor . 11 <br /> 532 Ground-Water Extraction and Treatment 12 <br /> 60 RECOMMENDED REMEDIAL ACTION 12 <br /> 70 PERMITS 12 <br /> 80 SYSTEM COMPONENTS 13 <br /> 81 Additional Vapor Extraction Wells 13 <br /> 82 Vapor Extraction System 13 <br /> 83 Process Controls 14 <br /> 84 Subgrade Piping 14 <br /> 9.0 VAPOR-EXTRACTION SYSTEM, SOURCE TEST, MONITORING <br /> AND VAPOR SAMPLING 14 <br /> 38032-13 <br />