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<br /> <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring ©2025 County of San Joaquin. All rights reserved. <br /> <br />iii <br />List of Figures _______________________________________ <br />Figure 1 Foothill Sanitary Landfill Vicinity Map <br />Figure 2 Landfill Base Design and Module Development <br />Figure 3 Groundwater Contour Map – First Quarter 2025 <br />Figure 4 Groundwater Contour Map – Second Quarter 2025 <br />Figure 5 Environmental System Soil Gas Monitoring Points <br /> <br /> <br />List of Tables ________________________________________ <br />Table 1 First Semiannual 2025 Monthly Refuse Disposal <br />Table 2 First Semiannual 2025 Groundwater Monitoring Results <br />Table 3 First Semiannual 2025 Surface Water Monitoring Results <br />Table 4 First Semiannual 2025 Leachate Area 1 Monitoring Results <br />Table 5 First Semiannual 2025 Leachate Field Measurements <br />Table 6 First Semiannual 2025 Unsaturated Soil Pore Gas TO-15 Monitoring <br /> Results <br />Table 7 First Semiannual 2025 Lysimeter Results <br /> <br /> <br />List of Appendices ___________________________________ <br />Appendix A Sampling and Analysis Procedures <br />Appendix B Water Sample Field Data Sheets <br />Appendix C Certified Analytical Reports, Chain of Custody and Laboratory Certification <br />Appendix D Statistical Methods to Determine Concentration Limits <br />Appendix E Historical Groundwater Monitoring Data <br />Appendix F Groundwater Direction and Flow Rate Calculations <br />Appendix G Standard Observations <br />Appendix H Historical Time Series Plots <br />Appendix I Soil Gas: Historical Monitoring Data and Certified Analytical Reports and <br />Chain of Custody