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Factors that primarily affect the quality of leachate produced include: <br /> • Composition of the waste <br /> • Rate of decomposition <br /> • Water infiltration rate <br /> In general, the rate of leachate generation at a landfill in a semi-arid climate such as Eastern San <br /> Joaquin County is highest early in the operating life of the facility. The long-term reduction in <br /> leachate generation is due to placement of additional refuse and closure final cover placement. <br /> At the Foothill Sanitary Landfill, contributions of moisture from outside sources to the waste <br /> mass will be limited because: <br /> • Surface water management consists of diverting surface water run-on away from active <br /> areas of the landfill; <br /> • Daily cover is placed which limits infiltration of precipitation that falls directly onto the <br /> • landfill; <br /> • A final cover will be constructed over all fill areas which will minimize infiltration into <br /> the waste mass; and <br /> • Landfill staff periodically inspects the cover on filled modules for low spots that could <br /> allow for ponding water and directs the operator to correct this condition. <br /> 3.3.2.2. Leachate Collection and Recovery System <br /> Module "I" does not have a leachate collection and recovery system. <br /> Module 1 and all future modules will include leachate collection and recovery systems (LCRSs). <br /> Leachate in Module 1 drains by gravity to the sump located in the southeast corner of the <br /> module, from which it is pumped either to the 10,000-gallon storage tank or returned to the <br /> refuse over an approved liner in accordance with the WDRs. <br /> Foothill Sanitary Landfill Page 14 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />