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Factors the primarily affect the quality of leachate produced include: <br />• Composition of the waste <br />• Rate of decomposition <br />• Water infiltration rate. <br />Leachate from MSW is a mixture of soluble organic and inorganic constituents, suspended solids, <br />and bacteriological constituents. Leachate quality varies depending on the waste source, climate, <br />season, site hydrology, cover soil, and landfill age. The leachate generally contains significantly <br />higher total dissolved solids, electrical conductivity, and chloride than groundwater. <br />In general, the rate of leachate generation at a landfill is highest early in the operating life of the <br />facility. The long-term reduction in leachate generation is due to final cover placement and low <br />permeability of the cover. <br />Go2.3.2.2 Leachate Collection and Recovery System <br />Leachate facilities are added and improved as needed. The leachate collection and recovery <br />systems presently at the NCRC&SL modules are as follows: <br />Modules 1 and 3 <br />• Pipes placed on top of the geomembrane base liner intercept and carry leachate to <br />perimeter sumps <br />• Sump with dedicated pump in each Module <br />• Volumetric flow meter for each sump pump <br />• 3,000 gallon leachate storage tank at the southwest corner of Module 1 <br />• Discharge pump located at the storage tank <br />• Infusion areas at upper elevation of Module 3 to receive leachate (primarily from <br />Modules 1 and 3) <br />North County RC&SL Page 9 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />