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�J <br /> s3 <br /> TABLE OF CONTENTS <br />• Page <br /> 10. INTRODUCTION AND SCOPE OF WORK 1 <br /> 20. BACKGROUND 1 <br /> 2 1 SITE LOCATION AND DESCRIPTION 1 <br /> 2 2 UNDERGROUND STORAGE TANK REMOVAL- FLAG CITY CHEVRON 1 <br /> 2 3 UNDERGROUND STORAGE TANK REMOVAL- THREE B'S TRUCK PLAZA 2 <br /> 2 4 REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING 2 <br /> 2 5 GROUND WATER DEPTH AND FLOW DIRECTION 3 <br /> 30. SUMMARY OF PRELIMINARY INVESTIGATION AND EVALUATION 3 <br /> 40. SOIL CHARACTERIZATION 12 <br /> 50. AQUIFER STEP DRAW-DOWN PUMP TEST 12 <br /> 60. ASSESSMENT OF HYDROCARBON-IMPACTED SOIL 13 <br /> 70. ASSESSMENT OF HYDROCARBON-IMPACTED GROUND WATER 14 <br /> 80 SOIL REMEDIATION ALTERNATIVES 18 <br /> 8 1 SOIL VAPOR EXTRACTION 18 <br /> 81 1 Principles 18 <br /> 8 12 Required Soil Conditions 19 <br /> 8 1 3 Monitoring Activities 19 <br /> 8 14 Feasibility 20 <br /> 8 1 5 Duration 20 <br /> 8 16 Estimated Cost of Soil Vapor Extraction 20 <br /> 82 EX-SITU TREATMENT OF IMPACTED SOIL 21 <br /> 8 2 1 Excavation 21 <br /> 8 2 2 Feasibility of Excavation 21 <br /> 8 2 3 Estimated Costs for Excavation 22 <br /> 83 IN-SITU BIOREMEDIATION 22 <br /> 8 3 1 Principles 22 <br /> 8 3 2 Nutrient Requirements and Toxicity 22 <br /> 8 3 3 Inoculation Wells 23 <br /> 8 3 4 Monitoring Activities 23 <br /> 8 3 5 Duration 23 <br /> 83 6 Feasibility 24 <br /> 83 7 Estimated Costs for ht-Situ Bioremediation 24 <br /> 8 4 NATURAL ATTENUATION 24 <br /> 8 4 1 Principles 24 <br /> 8 4 2 Duration 25 <br /> 843 Feasibility 25 <br /> 844 Estimated Cost 26 <br /> 90 GROUND WATER REMEDIATION ALTERNATIVES 26 <br /> 9 1 IN-SITU AIR SPARGING 26 <br /> 9 1 1 Principles 26 <br /> ,Advanced GcoEnllronmental,Inc <br />