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i <br /> "SOMA <br /> • TABLE OF CONTENTS Working To Restore Nature <br /> i INTRODUCTION 1 <br /> BACKGROUND 2 <br /> Site Description 2 <br /> Proximity of Wells and Utilities 2 <br /> REGIONAL GEOLOGY AND HYDROLOGY 3 <br /> SCOPE OF INVESTIGATION 3 <br /> Underground Storage Tank Removal 4 <br /> Assessment of Soil 5 <br /> Soil-Vapor Survey 5 <br /> Soil Borings 5 <br /> Vapor-Extraction Well Installation 6 <br /> Assessment of Ground Water 6 <br /> Ground-Water Monitoring Well Construction 6 <br /> Ground-Water Monitoring 7 <br /> Evaluation of Ground-Water Gradient and Flow Direction 8 <br /> Laboratory Analyses 8 <br /> Vapor-Extraction Test 8 <br /> Evaluation of Aquifer Parameters 9 <br /> SITE CONDITIONS 10 <br /> Site Geology 10 <br /> Site Hydrogeology 10 <br /> Residual Hydrocarbons in Soil 11 <br /> Residual Hydrocarbons In Tank Pit Area 11 <br /> Residual Hydrocarbons In Dispenser Area 12 <br /> Free Hydrocarbons in Ground Water 12 <br /> Dissolved Hydrocarbons and Selected Chemicals in Ground Water 13 <br /> REMEDIATION OPTIONS 14 <br /> Excavation 14 <br /> Vapor Extraction 15 <br /> Ground-Water Monitoring 15 <br /> Hydraulic Control 16 <br /> Ground-Water Extraction and Treatment 16 <br /> SUMMARY AND RECOMMENDATIONS 17 <br /> LIMITATIONS 18 <br /> REFERENCES 19 <br /> 38032-10 <br />