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• Infiltration <br />• Surface water run-on <br />• Evapotranspiration <br />• Final cover design <br />• Waste field capacity <br />• Waste compression <br />• Age of the site <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 reduction <br />in leachate generation is due to placement of additional refuse and closure final cover <br />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 the <br />waste mass. <br />Foothill Sanitary Landfill Page 95 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />