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Closing the crest of Module"I",where no additional refuse will be placed,will also be <br /> considered at that time. This would result in the closure of approximately 14 acres (17%) of the <br /> footprint of Module"I". The remaining surfaces would be provided with the long-term <br /> intermediate cover per WDR Facility Specification No. 8 (two-foot total cover on sideslopes, <br /> three-foot cover on flatter areas). <br /> MONITORING PLAN <br /> General <br /> All monitoring wells will be monitored under the guidelines of the Detection Monitoring. <br /> Program established by WDR Order No. R5-2003-0020. Restoration of detection monitoring is <br /> proposed at well MW-3. <br /> Installation of New Monitoring Well MWA <br /> Inclusion of the groundwater elevation at well LW-1 in the estimate of groundwater contours has <br /> caused a revision of the estimated groundwater flow direction(Figure 3). The new gradients <br /> indicate that the location of monitoring well MW-1 may not be appropriate to monitor <br /> groundwater up-gradient of the landfill. The uncertainty caused by this positioning, and the lack <br /> of knowledge of the natural variations in the groundwater that may occur on the site, makes <br /> assessment of groundwater monitoring data more difficult. <br /> In order to ensure accurate assessment of potential groundwater impacts,we propose to install an <br /> additional up-gradient well MW-4 north of the existing landfill, at approximately the same <br /> distance from the edge of refuse as existing well MW-1. Data from this well will be included <br /> with the data from MW-1 as background data,which will be used to evaluate the data from the <br /> other, down-gradient wells. <br /> N:\1 Foothill\Groundwater Monitoring\EvalMonitPlan\FHCorrActPlan2.doc <br /> 1 <br /> Engineering Feasibility Report 7 Foothill Sanitary Landfill <br /> October 30,2003 San Joaquin County Solid Waste <br />