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® LEACHATE COLLECTION AND RECOVERY SYSTEM - PROCEDURES & <br /> MAINTENANCE <br /> Facilities <br /> The leachate collection and recovery system (LCRS)for Module 1 was designed in accordance <br /> with Title 27, Section 20340(8). This system consists of: <br /> ■ East/west oriented collection troughs running the entire length of Module 1 <br /> ■ A 4-foot deep sump at the southeast corner of the Module <br /> ■ A leachate removal pump installed in an18-inch diameter HDPE pipe <br /> ■ A 2-foot deep secondary extraction trench beneath the primary composite liner,with <br /> 12-inch HDPE riser pipe <br /> ■ 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 /> Foothill Sanitary Landfill 11 Department of Public Works/Solid Waste <br /> 1ST Semester 2005 Groundwater Monitoring County of San Joaquin-July 29,2005 <br />