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Additional Site Assessment Work Plan DEN'S AUTO REPAIR 308 South El Dorado Street, Stockton, California TABLE OF CONTENTS L SECTION PAGE LM 1.0. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 r 2.0. BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING . . . . . . . . . : . . . . . . . 1 • 2.2. UNDERGROUND STORAGE TANK REMOVAL . .. . ... . . . . . . . . . . . . . . . . .. 2 L. 2.3. PREVIOUS SITE ASSESSMENT AND SAMPLING . . . . . . . . . . . . . . . . . . . . . 2 i 3.0. SCOPE OF WORK . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . :. . . . . . . . . . . . . 4 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES . . . . . . . . . . . . . . . . . . . 4 3.2. DRILLING AND SOIL SAMPLE COLLECTION . . . . . . . . . . . . . . . . . . . . . . . . 4 3.3. MONITORING WELL INSTALLATION, DEVELOPMENT, AND i. SURVEY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 5 3.4. GROUND WATER SAMPLING AND ANALYSIS . . . .. . . ... . . . . . . . . . . . . . . 6 3.5. PREPARATION OF REPORT OF FINDINGS . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.0. FIELD PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1. PILOT SOIL BORING . . . . . . . . . . . . . . . . . . : . . 6 L 4.2. WELL COMPLETION AND WELL ELEVATION SURVEY 7 4.3. WELL DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 7 4.4. GROUNDWATER SAMPLING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . 8 L 4.4.1. Static Water Level Measurements . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 8 4.4.2. Well Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4.3. Sample Withdrawal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 L 4.4.4. Sample Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.5. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT . . . . . . . . . . 9 L FIGURES Figure 1 -Location Map Figure 2 '_Site Plan V Figure 3 -Proposed Monitoring Well Design -HUI Figure 4 -Proposed Monitoring Well Design -HU2 Figure 5 -Proposed Monitoring Well Design -HU3 Advanced GeoEnvironmental,Inc.