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At NCRC&SL, contributions of moisture from outside sources to the waste mass will be limited <br /> 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 <br /> the waste mass; and <br /> • Landfill staff periodically inspects the cover on filled modules for low spots that could <br /> allow for ponding water. <br /> 3.3.1 Landfill Gas <br /> NCRC&SL landfill gas (LFG) system consists of 8-soil gas monitoring points (see Plate 5) and a <br /> soil gas trench under Module 4. SG-1, SG-2, SG-3 and SG-8 have three gas probes that monitor <br /> different depths, shallow (S), intermediate (I), and deep (D). SG-4, SG-5, SG-6, and SG-7 have <br /> one probe each. Off-site migration is monitored at soil gas wells SG-1 through -5, -7, and -8. <br /> Combustible gas is not detected above regulatory limits at the perimeter monitoring wells. <br /> Recent monitoring results are attached in Appendix B. SG-6 has shown combustible gas <br /> consistently above 20%, but this well is not on the migration monitoring perimeter. VOCs have <br /> been found at many of the soil gas wells. <br /> 3.3.2 Leachate <br /> 3.3.2.1 General <br /> Leachate is water that comes in contact with waste. Leachate is primarily a result of water <br /> infiltration throughout the waste mass,waste settlement, or waste decomposition. <br /> North County RC&SL Page 11 of 48 Public Works/Solid Waste <br /> JTD County of San Joaquin—November 30,2004 <br />