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The quantity of leachate generated in MSW landfills is dependent on the following factors: <br /> • Infiltration; <br /> • Surface water run-on; <br /> • Evapotranspiration; <br /> • Final cover design; <br /> • Waste field capacity; <br /> • Waste compression; and <br /> • Age of the site. <br /> Factors the primarily affect the quality of leachate produced include: <br /> • Composition of the waste; <br /> • Rate of decomposition; and <br /> • Water infiltration rate. <br /> Leachate from MSW is a mixture of soluble organic and inorganic constituents, suspended <br /> solids, and bacteriological constituents. Leachate quality varies depending on the waste source, <br /> climate, season, site hydrology, cover soil, and landfill age. A comparison of leachate data to <br /> groundwater data at the NCRC&SL shows that leachate generally contains significantly higher <br /> total dissolved solids, electrical conductivity, and chloride. <br /> The quantity of leachate collected from NCRC&SL during the second semester of 2003 and the <br /> first semester of 2004 are shown on Table 3. Leachate from the sumps is monitored monthly. <br /> Leachate sampling results for the first semester 2004 are shown in Appendix B. <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 /> 3.3.2.2 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 /> North County RC&SL Page 12 of 48 Public Works/Solid Waste <br /> County of San Joaquin—November 30,2004 <br /> JTD <br />