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El <br />v <br />C7 <br />2.3.1 Landfill Gas (LFG) <br />2.3.1.1 Landfill Gas Migration Monitoring and Control <br />The monitoring perimeter and on-site structures are monitored in accordance with the Landfill <br />Gas Monitoring and Control Plan (Appendix 1). At this time, the migration monitoring system <br />consists of eighteen monitoring wells (Appendix 1). These wells include three sampling intervals <br />in accordance with California Code of Regulations (CCR) Title 27 Article 6. The site was in full <br />compliance with these regulations. <br />Subsurface migration is controlled by the LFG system, installed in 2006 and operated in <br />accordance with San Joaquin Valley Air Pollution District, N-1119. The system consists of <br />vertical wells and horizontal trench collectors, and is connected to three pre-existing leachate <br />risers. Additional collectors are installed as the landfill develops. <br />2.3.1.2 Landfill Gas Emissions Control <br />Surface emissions are controlled by the LFG collection and treatment system described above. <br />Collected LFG is combusted in a temperature -controlled flare (Plate 6). <br />2.3.2 Leachate <br />2.3.2.1 General <br />Leachate is water that has come into contact with waste. Leachate is primarily a result of water <br />infiltration throughout the waste mass, waste settlement, or waste decomposition. <br />The quantity of leachate generated in MSW landfills is dependent on the following factors: <br />• Infiltration (affected by surface slope and cover design) <br />• Surface water run-on <br />• Evapotranspiration <br />• Waste field capacity <br />• Waste compression <br />• Age of the site <br />North County RC&SL <br />Joint Technical Document <br />Page 8 of 69 Public Works/Solid Waste <br />County of San Joaquin — February 10, 2010 <br />