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TABLE OF CONTENTS <br /> 10 INTRODUCTION 1 <br /> 20 PROJECT BACKGROUND INFORMATION 1 <br /> 2 1 Site Description 1 <br /> 2 2 Site History and Site Activities 2 <br /> 2 3 Site Geology 3 <br /> 2 4 Site Hydrogeology 3 <br /> 2 5 Local Water Supply 4 <br /> 30 SUMMARY OF INVESTIGATION RESULTS 5 <br /> 3 1 Distribution of Petroleum Hydrocarbons in Soil 5 <br /> 3 2 Distribution of Petroleum Hydrocarbons in Ground Water 6 <br /> 40 SITE REMEDIATION 7 <br /> 4 1 Free Product Recovery . . 7 <br /> 4 2 Tank and Product Lane Removal Activities 7 <br /> 4 3 Soil Vapor Extraction . . . . 8 <br /> 50 MASS BALANCE CALCULATIONS 9 <br /> 60 MASS BALANCE CALCULATIONS, GROUND WATER 10 <br /> 70 RISK-BASED CORRECTIVE ACTION 11 <br /> 7 1 Chemicals of Concern - Source Characterization 11, <br /> 7 1 1 Soil 11 <br /> 7 1 2 Ground Water 12 <br /> 7 13 Exposure Point Evaluation of Chemicals of Concern 13 <br /> 8 0 TIER 1 EVALUATION 13 <br /> 8 1 Exposure Pathways 13 <br /> 82 Exposure to Impacted Subsurface and Surface Sods . 13 <br /> 8 2.1 Vapor Inhalation and Dust Ingestion . . . 13 <br /> 8 2.2 Dermal Contact . . 13 <br /> 8 2.3 Vapors to Enclosed Spaces 13 <br /> 8 2.4 Vapors To Ambient Air 14 <br /> 8 2.5 Leaching to Ground Water 14 <br /> 83 Exposure to Impacted Ground Water 15 <br /> 8 3 1 Vapors to Ambient Air . . 15 <br /> 8 3 2 Vapors to Enclosed Spaces 15 <br /> 8 3 3 Ingestion 15 <br /> 8 3 4 Discharge to Surface Water 15 <br /> 9 0 TIER 2 EVALUATION 16 <br /> 9 1 Vapors to Enclosed Spaces 16 <br /> 9 2 Ground Water Ingestion Exposure 16 <br /> 9 2 1 Natural Attenuation Factor(NAF) 17 <br /> 9 2 2 Ground Water SSTL 17 <br /> 9 2 3 Subsurface Soil SSTL 17 <br />