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Operation <br />Leachate drains by gravity to the sumps of Module 1 and 3, and is removed by manually <br />activating the sump pumps. Once a pump is activated, pumping continues until the selected <br />sump is "dry", causing an automatic shutdown by a sensor on the pump electrical current. <br />Module 1 and 3 leachate sump pumps are operated at least two days per week. Often the sump <br />pumps are operated daily at the discretion of facility staff. <br />Leachate from Modules 1 and 3 is pumped to the leachate storage tank. The tank discharge <br />pump operates automatically, turning on and off based on the float sensor within the tank to <br />maintain the tank level between 1/2 and 2/3 full. If the leachate level in the tank reaches a "high- <br />level" alarm sensor, then the leachate sump pumps are deactivated, preventing overflow of the <br />tank. <br />The tank discharge pump returns the leachate to the landfill at a horizontal LFG collector in refuse <br />now approximately 10 feet below the landfill surface of Module 3 (approximate elevation 160 <br />NGVD). Approximately 70 feet of refuse in multiple lifts is in place below this collector. Other <br />infusion points over Module 3 or other Subtitle D liners may be used. <br />Facilities <br />The leachate facilities for Module 4 include: <br />• Sump with dedicated pump in Module 4. <br />• Volumetric flow meter for the leachate sump pump, indicating total gallons pumped and <br />instantaneous flow rate. <br />• A 10,000 -gallon leachate storage tank, provided with a float switch, which activates <br />alarms based on high or low level conditions. <br />• Transfer pump, which can deliver leachate from the storage tank into a water truck if <br />needed. <br />■ Return Pump to pump leachate from the tank back to one of the Subtitle D Modules, if <br />needed. <br />Operation <br />Leachate drains by gravity to the Module 4 sump, from which it returned to the refuse. Additional <br />infusion areas are constructed in Module 4 as needed. <br />Module 1-3 LCRS Pump Control Upgrade2 North County Recycling Center and Sanitary Landfill <br />May 26, 2010 San Joaquin County <br />