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LEACHATE COLLECTION AND RECOVERY SYSTEM - PROCEDURES & MAINTENANCE Facilities The leachate collection and recovery system(LCRS) for Module 1 was designed in accordance with Title 27, Section 20340(g). This system consists of: • East/west oriented collection troughs running the entire length of Module 1 • A 4-foot deep sump at the southeast corner of the Module • A leachate removal pump installed in an 18-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 Leachate drains by gravity to the Module 1 sump, from which the pump installed in the sump pumps it to the 10,000-gallon storage tank. The pump operates automatically, based on leachate level within the sump. Control points for the pump are: Pump Off 17" Pump On: 43" 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 to prevent overtopping of the tank. Disposal Leachate is applied to the waste surfaces or travel surfaces within Module 1 in accordance with the WDR. Leachate is either pumped directly from the sump to the active face, or pumped to the storage tank from which it is removed by water truck to Module 1. At no time was leachate returned to Module"I". Foothill Sanitary Landfill Department of Public Works/Solid Waste 1n Semester 2010 Groundwater Monitoring County of San Joaquin—July 21,2010