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C7 <br />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 <br />San Joaquin County is highest early in the operating life of the facility. The long-term <br />reduction in leachate generation is due to placement of additional refuse and closure final <br />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 <br />active 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. <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 />Module "I" does not have a leachate collection and recovery system. Module 1 and all <br />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 <br />the module, from which it is pumped either to the 10,000 -gallon storage tank or returned <br />to the refuse over an approved liner in accordance with the WDRs. <br />0 <br />Foothill Sanitary Landfill Page 52 of 57 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />