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North County RC&SL Page 9 of 64 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin – Revised July 14, 2025 <br /> <br />• Infiltration rate (affected by surface slope and cover design) <br />• Surface water run-on (which is prevented by the drainage facilities at the site) <br />• Evapotranspiration <br />• Waste field capacity <br />• Waste compression <br />• Age of the site <br /> <br />Leachate quality varies depending on the waste source, climate, season, site hydrology, cover <br />soil, and landfill age. The leachate generally contains significantly higher total dissolved solids, <br />electrical conductivity, and chloride than groundwater. <br /> <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 /> <br />2.3.2.2 Leachate Collection and Recovery System <br />Leachate facilities are constructed with each new cell or module. Leachate collection and <br />recovery systems include: <br /> <br />• Pipes placed on top of the base liner to intercept and carry leachate to perimeter sumps. <br />• Every sump has a dedicated pump and volumetric flow meter. <br />• Piping to move leachate back up the slope to be Infused in upper refuse lifts. <br /> <br />Areas 1 and 3 are provided with: <br />• 3,000 gallon leachate storage tank at the southwest corner of Area 1 <br />• Discharge pump located at the storage tank <br /> <br />Area 4 is provided with: <br />• 10,000 gallon leachate storage tank <br />• Transfer pump to fill water trucks, if needed <br />• Return pump to pump leachate back to the refuse, if needed <br />