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Closure Summary Report - August 2005 FLAG CITY CHEVRON 6421 Capitol Avenue,Lodi, California TABLE OF CONTENTS SECTION PAGE 1.0. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.0. BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 21 PRELIMINARY SITE ASSESSMENT 2 22 UNDERGROUND STORAGE TANK REMOVAL 3 23 SITE INVESTIGATION 4 24 GROUND WATER MONITORING PROGRAM 11 2 4 1 Ground Water Depths 12 2 4 2 Ground Water Flow Direction and Gradient 12 2 4 3 Dissolved MTBE Concentrations 12 25 SOIL PROPERTIES /HYDROSTRATIGRAPHY 13 26 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING 15 3.0. ASSESSMENT OF MTBE-IMPACTED SOIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3 1 VADOSE ZONE MTBE-IMPACT 16 3 2 SMEAR ZONE MTBE-IMPACT 17 33 SATURATED ZONE MTBE-IMPACT 17 34 VOLUMETRIC CALCULATIONS 17 4.0. ASSESSMENT OF HYDROCARBON-IMPACTED GROUND WATER . . . . . . . 18 5.0. CORRECTIVE ACTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.0. WATER WELL RECEPTOR SURVEY . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 21 7.0. RISK ASSESSMENT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 71 FATE AND TRANSPORT 23 7 1 1 Saturated Soil To Ground Water Model 23 7 12 Dissolved Source To Ground Water Model 24 72 RISK ASSESSMENT AND CLEANUP LEVELS 25 7 2 1 Assessment of Risk 25 7 2 2 Cleanup Levels 26 8.0. DISCUSSION AND CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 •' 9.0. RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Advanced GeoEnviroamental,Inc