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TABLE OF CONTENTS <br /> 10 BACKGROUND 1 <br /> 11 Site Description 1 <br /> 12 Proximity of Municipal Wells 1 <br /> 13 Previous Work 1 <br /> 14 Work performed by Ground Zero in 1995 3 <br /> 141 Additional Investigation 3 { <br /> 1 4 2 Vapor Test Well Construction and Vapor Extraction Test 5 <br /> 1 4 3 Fourth Quarter 1995 Monitoring and Sampling 5 <br /> 1 4 4 Soil Stockpile and Purge Water Disposal 6 <br /> 1 4 5 Excavation Clean-Out and Backfilling 6 <br /> I ' 20 SITE CHARACTERIZATION 6 <br /> 21 Regional Geology and Hydrogeology 6 <br /> 22 Soil Lithology 7 <br /> ' 2 3 Local Hydrogeology 8 <br /> 24 Residual Hydrocarbons 1n Soil 8 <br /> 2 5 Toxicity, Persistence, and Potential for Contaminant Migration 8 <br /> 3 0 EVALUATION OF REMEDIAL ALTERNATIVES 9 <br /> 31 Remedial Alternatives for Soil And Groundwater 9 <br /> 3 2 Selection Criteria 9 <br /> 3 2 1 Alternative 1 - Passive Remediation 10 <br /> ' 3 2 2 Alternative 2 - Soil Excavation and Offsite Disposal 10 <br /> 3 2 3 Alternative 3 - Soil Vapor Extraction with Groundwater <br /> Monitoring 11 <br /> ' 3 2 4 Alternative 4 - Soil Vapor Extraction, Air Sparging, and <br /> Groundwater Monitoring 11 <br /> 3 25 Alternative 5 - Soil Vapor Extraction with Groundwater <br /> Extraction 12 <br /> 3 3 Remediation Alternatives Evaluation 12 <br /> 3 3 1 Alternative 1 - Passive Remediation 12 <br /> ' 3 3 2 Alternative 2 - Soil Excavation and Off-site Disposal 14 <br /> 3 3 3 Alternative 3 - Soil Vapor Extraction with Groundwater <br /> Monitoring 15 <br /> ' 3 3 4 Alternative 4 - Soil Vapor Extraction/Air Spargmg with <br /> Groundwater Monitoring 17 <br /> 3 3 5 Alternative 5 - Soil Vapor Extraction with Groundwater <br /> ' Extraction 18 <br /> groandze�mWcsp ] <br />