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' Quarterly Report - First Quarter 2004 S THREE B'S TRUCK PLAZA ' 14749 Thornton Road, Lodi, California TABLE OF CONTENTS SECTION PAGE ' 10. INTRODUCTION AND SCOPE OF WORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 I 2.0. MONITORING AND SAMPLING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . 1 21 WELL MONITORING AND EVACUATION 2 2 2 GROUND WATER SAMPLING 2 ' 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES 3 3.0. FINDINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ' 3 1 GROUND WATER ELEVATION AND GRADIENT 3 3 1 1 Hydrologic Unit 1 4 3 1 2 Hydrologic Unit 2 4 I 3 1 3 Hydrologic Unit 3 4 3 14 Hydrologic Unit 4 5 3 15 Hydrologic Unit 6 5 10 32 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES 5 ' 4.0. SUMMARY AND CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.0. RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.0. LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 FIGURES Figure 1 -Location Map Figure 2 -Site Plan Figure 3 - Vertical Gradient Cross Section C-C' 15 March 2004 Figure 4 -Inferred Ground Water Elevations Hydrologic Unit 1 Figure 5 -Inferred Ground Water Elevations Hydrologic Unit 2 Figure 6 -Inferred Ground Water Elevations Hydrologic Unit 3 I Figure 7 -Inferred Ground Water Elevations Hydrologic Unit 4 Figure 8 -Inferred Ground Water Elevations Hydrologic Unit 6 Figure 9 -Estimated Extent of Dissolved TPH-g Hydrologic Unit 1 ' Figure 10 -Estimated Extent of Dissolved TPH-d Hydrologic Unit I Figure 11 -Estimated Extent of Dissolved MTBE Hydrologic Unit 1 Figure 12 -Estimated Extent of Dissolved MTBE Hydrologic Unit 2 IAdvanced Geo Env[ronmental,Inc