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Subsurface LFG migration is monitored at wells SG-2 through SG-10 and SG-12, which <br /> comprise the monitoring perimeter. The site is in compliance with Title 27, Section 20919.5 et <br /> seq (control of explosive gases) at this time. <br /> The concentrations of VOCs are monitored by sampling at all soil gas wells and at the soil gas <br /> trench beneath Module 1. During the second quarter of 2004, VOCs were detected in all of the <br /> soil gas samples. The highest VOC concentration was found in SG-1, which is closest to the <br /> landfill (Appendix B). <br /> A LFG collection and treatment system is not installed at this time; however, installation of such <br /> a system is scheduled for 2006. <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 infiltrating <br /> rain water, although some moisture is released through waste decomposition and consolidation <br /> of the waste mass. Leachate from MSW is a mixture of soluble organic and inorganic <br /> constituents, suspended solids, and bacteriological constituents. <br /> 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 <br /> • Age of the site <br /> Foothill Sanitary Landfill Page 13 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />