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r <br /> rTABLE OF CONTENTS <br /> 10 INTRODUCTION 1 <br /> 11 Purpose 1 <br /> r12 Scope of Services 1 <br /> 20 BACKGROUND 3 <br /> 21 Facility Description 3 <br /> 22 Summary of Previous Assessments 3 <br /> 23 Physical Description 4 <br />' 2 3 1 Topography 4 <br /> 2 3 2 Surrounding Land Use 5 <br /> 24 Geology 5 <br /> r 2 4 1 Regional Geology 5 <br /> 2 4 2 Site Geology 5 <br /> 25 Regional and Site Hydrogeology 5 <br /> 3 0 FIELD INVESTIGATION AND RATIONALE 7 <br /> 31 Soil Boring Methods and Installation of Groundwater Monitoring Wells 7 <br /> r3 2 Soil Sampling 7 <br /> 3 3 Field Screening of Soil Samples 7 <br /> 34 Installation of Groundwater Monitoring Well 8 <br /> 3 5 Soil Analyses 8 <br /> 3 6 Groundwater Sampling 8 <br /> 3 7 Groundwater Analyses 8 <br /> r38 Well Development 9 <br /> 3 9 12-Hour Pump Test 9 <br />' 3 10 Extraction Well Groundwater Sampling 9 <br /> 40 FINDINGS 10 <br />' <br /> 41 Site Lithology and Hydrogeology 10 <br /> 42 Results of Laboratory Analyses of Soil Samples 10 <br /> 43 Results of Laboratory Analyses of Groundwater Samples 10 <br /> r44 Petroleum Hydrocarbon Recovery 11 <br /> 5 0 GROUNDWATER EXTRACTION RESULTS 11 <br /> 60 REMEDIAL ALTERNATIVE 14 <br /> 61 Soil Remediation 15 <br /> r 6 1 1 OPTION I - Passive Soil Remediation-No Action 15 <br /> 6 1 2 OPTION II - Soil Vapor Extraction With Off-Gas Treatment 15 <br /> 6 13 OPTION III -In-Situ Bioremediation 15 <br /> r <br /> A 1152871 ASA i <br /> 1 <br />