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Pumping Procedures <br /> Leachate drains by gravity to the Module 1 sump, from which the pump installed in the sump <br /> pumps it to the 10,000-gallon storage tank. The pump operates automatically, based on leachate <br /> 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 flow rate provided by the sump pump is tested monthly. A decrease in pumping rate will <br /> indicate the need to clean a filter or to investigate pump wear. Leachate production rate is greater <br /> in the late winter and spring, compared to summer and autumn, because little or no rain falls on <br /> the site from April to November of each year. The LCRS includes pipe risers at the end of each <br /> leachate lateral to enable video camera inspection of key portions of the pipe network. The <br /> moderate pipe bends of the risers allow cameras to be pushed several hundred feet into the <br /> network to record pipe conditions and depth of flows in the LCRS network. A wire rope is <br /> installed in each leachate lateral pipe to enable the pulling of a camera through the entire length of <br /> the risers. <br /> Foothill Sanitary Landfill 10 Department of Public Works/Solid'Waste <br /> 2`d Semester and Annual 2008 Groundwater Monitoring County of San Joaquin—January 31,2009 <br />