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<br /> <br />Foothill Sanitary Landfill Page 46 of 52 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 12/04/2025 <br /> <br /> <br />a) The LEA will be notified by telephone or via email regarding the detection of <br />excessive LFG concentrations. <br /> <br />b) A note about the excessive LFG detection will be placed on the perimeter <br />monitoring logbook. <br /> <br />c) A letter will be mailed to the LEA within seven (7) days after detection with the <br />following information: <br /> <br />x A brief description about problem and the extent. <br />x Monitoring results. <br />x Description about the site’s LFG collection and control system adjustment to <br />mitigate LFG migration around the problem area of the site. <br /> <br />d) The non-compliance LFG migration monitoring well will be monitored again after <br />one week. If the results indicate the well is in compliance, then the LEA will be <br />notified. If the monitoring results do not indicate the well is in full compliance, then a <br />remediation plan about increasing the LFG collection in the vicinity of the non- <br />compliant well will be submitted to the LEA. <br /> <br />7.13. Groundwater Monitoring <br />Groundwater is monitored at seven (7) groundwater monitoring wells. Monitoring wells <br />include one upgradient well MW-4, two downgradient wells MW-5 and MW-6, and two cross- <br />gradient wells MW-1 and MW-3 (see Figure 12). The supply well LW-1 is included as part of the <br />monitoring and reporting program for the landfill. <br /> <br />Groundwater is monitored semi-annually at all wells with the exception of MW-3, which <br />is monitored quarterly beginning in 2015. <br /> <br />Prior to March 2000, impacts to groundwater were not indicated. From March 2000 to <br />October 2001, volatile organic compounds (VOCs) were first detected at groundwater