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® A pumping system that allows recording of leachate flows and volumes <br /> ® A 10,000 gallon leachate storage tank <br /> Pumping Procedures <br /> Leachate drains by gravity to the Module 1 sump, from which it is pumped to the 10,000-gallon <br /> storage tank by the pump installed in the sump. The pump operates automatically, based on <br /> leachate level within the sump. Control points for the pump are: <br /> Pump Off: 12" Pump On: 36" Alarm:48" <br /> Operation of the pump is conditional upon sufficient water in the sump and available capacity in <br /> the leachate tank. Electrical controls include a high level alarm set at the maximum design <br /> leachate level for the sump. The alarm is activated if the leachate exceeds the alarm level. The <br /> alarm level is chosen to maintain the head on the module base below the maximum allowed 12 <br /> inches. <br /> The leachate storage tank facility includes secondary containment(consisting of a concrete vault <br /> surrounding the tank) and a truck loading area. Electrical controls for the leachate storage tank <br /> include a high level sensor that will sound an alarm and disable the leachate sump pump to prevent <br /> overtopping of the tank. <br /> Disposal <br /> Leachate is applied to the waste surfaces or travel surfaces within Module 1 in accordance with the <br /> WDR. Leachate is either pumped directly from the sump to the active face, or pumped to the <br /> storage tank from which it is removed by water truck to Module 1. At no time was leachate <br /> returned to Module "I". <br /> Leachate System Monitoring and Maintenance <br /> The cumulative volume of leachate removed from the sump and the flow rate provided by the <br /> sump pump is tested monthly. A decrease in pumping rate will indicate the need to clean a filter <br /> or to investigate pump wear. <br /> Leachate production rate is greater in the late winter and spring, compared to summer and autumn, <br /> because little or no rain falls on the site from April to November of each year. <br /> The LCRS includes pipe risers at the end of each leachate lateral to enable video camera <br /> inspection of key portions of the pipe network. The moderate pipe bends of the risers allow <br /> cameras to be pushed several hundred feet into the network to record pipe conditions and depth of <br /> flows in the LCRS network. A wire rope is installed in each leachate lateral pipe to enable the <br /> pulling of a camera through the entire length of the risers. <br /> Foothill Sanitary landfill g Department of Public Works/Solid Waste <br /> 2 nd Semester Groundwater Monitoring County of San Joaquin-January 31,2007 <br />