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■ A leachate removal pump installed in anl8-inch diameter HDPE pipe ■ A 2-foot deep secondary extraction trench beneath the primary composite liner,with 12-inch HDPE riser pipe ■ A pumping system that allows recording of leachate flows and volumes ■ A 10,000 gallon leachate storage tank Pumping Procedures Leachate drains b gravity to the Module 1 sump, from which it is pumped to the 10,000-gallon Y�' Y p P p g storage tank by the pump installed in the sump. The pump operates automatically, based on leachate level within the sump. Control points for the pump are: ■ Pump Off. 12" ■. Pump On: 36" ■ Alarm: 48" Operation of the pump is conditional upon sufficient water in the sump and available capacity in the leachate tank. Electrical controls include a high level alarm set at the maximum design leachate level for the sump. The alarm is activated if the leachate exceeds the alarm level. The alarm level is chosen to maintain the head on the module base below the maximum allowed 12 inches. The leachate storage tank facility includes secondary containment(consisting of a concrete vault surrounding the tank) and a truck loading area. Electrical controls for the leachate storage tank include a high level sensor that will sound an alarm and disable the leachate sump pump in case of high leachate level to prevent overtopping of the tank. Disposal Leachate is removed as needed from the tank by water truck or by other means and applied to the waste surfaces or travel surfaces within Module 1. Leachate System Monitoring and Maintenance The cumulative volume of leachate removed from the sump and the flow rate provided by the sump pump is tested monthly. A decrease in pumping rate will indicate the need to clean a filter or to investigate pump wear. The LCRS includes pipe risers at the end of each leachate lateral to enable video camera inspection of key portions of the pipe network. The moderate pipe bends of the risers allow cameras to be pushed several hundred feet into the network to record pipe conditions and depth of flows in the LCRS network. A wire rope is installed in each leachate lateral pipe to enable the pulling of a camera through the entire length of the risers. Foothill Sanitary Landfill g Department of Public Works/Solid Waste 1ST Semester 2004 Groundwater Monitoring County of San Joaquin-July 27,2004