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SITE CONCEPTUAL MODEL AND REMEDIAL ACTION PLAN i <br /> 7-Eleven Store No 14117, 2725 Country Club Blvd , Stockton, CA June 20,2002 <br /> CONTENTS <br /> 1 0 SUMMARY OF SITE ASSESSMENT DATA 1 <br /> ' 11 Soil Data Summary 1 <br /> 12 Dissolved Data Summary 2 <br /> ' <br /> 13 Source Area Evaluation/UST Tightness 2 <br /> 2 0 GEOLOGY/HYDROGEOLOGY 3 <br /> 3 0 MTBEITBA FATE AND TRANSPORT STUDY 3 <br /> ' 4 0 REMEDIATION ALTERNATIVE EVALUATION 4 <br /> 41 Excavation 5 <br /> 42 Air Sparging/Soil Vapor Extraction 5 <br /> 43 Dual-Phase Extraction/Intrinsic Biodegradation 6 <br /> 4 3 1 Pilot Test 7 <br /> 5 0 TREATMENT ALTERNATIVE COST COMPARISON 8 <br /> ' 51 Capital Costs 8 <br /> 52 Installation Costs 9 <br /> 53 Monthly O&M Costs 9 <br /> 54 Life-Cycle O&M Costs 9 <br /> 6 0 PROPOSED REMEDIATION METHOD 10 <br /> 61 Length of Remediation 10 <br /> 62 Progress Monitoring 11 <br /> 63 Permitting/Reporting 11 <br /> ' <br /> 64 Health and Safety 11 <br /> 7 0 SITE CLOSURE 12 <br /> Figures <br /> ' 1 Site Location Map <br /> 2 Site Map <br /> ' 3 Cross-Sections A—A' and B— B' <br /> 4 Feasibility Cost Comparison <br /> Appendices <br /> ' A Fate and Transport Modeling Results <br /> B Pilot Test and Background Data <br /> 1 <br /> 14117Scm2 doc <br />