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C <br />4.1 Compliance with §60.759(a)(1) <br />§60.659(a)(1) The collection devices within the interior and along the <br />perimeter areas shall be certified to achieve comprehensive control of <br />surface gas emissions by a professional engineer. The following issues <br />shall be addressed in the design: depths of refuse, refuse gas generation <br />rates and flow characteristics, cover properties, gas system <br />expandability, leachate and condensate management, accessibility, <br />compatibility with filling operations, integration with closure end use, air <br />intrusion control, corrosion resistance, fill settlement, and resistance to <br />the refuse decomposition heat. <br />The final GCCS design will be certified, sealed, and signed by a professional engineer. <br />Isucs >rcl tcd to c,ar>li with §60.75.()(1). are disc�ecl in the following.tions. <br />4.1.1 Control of Surface Emissions <br />The GCCS will be designed to control LFG surface emissions using design guideline. <br />Surface emissions will be monitored to verify conformance with surface emissions limits. <br />A Surface Emission Response Pian in case surface emission limits are exceeded is <br />contained in Appendix. <br />4.1.2 Depth of Refuse <br />The nominal depth of the landfill is 130 ft. Vertical LFG collection wells will be placed <br />in the interior and across the front face to provide emission control using a nominal <br />maximum well depth of 100 feet. Horizontal wells will be installed as the landfill is <br />constructed and will be installed at nominally 40-60 feet vertical increments. <br />The elevation of the vertical well collection zone will be a minimum of 20 feet below <br />final grade and a minimum of 75 feet from the nearest outside landfill slope. Perforation <br />depth or setback will be greater if deemed appropriate by the engineer because of site- <br />specific conditions. Horizontal wells will be installed a minimum of 20 feet below final <br />grade. <br />4.1.3 Landfill Gas Collection Rate <br />For the purposes of design, the rate of LFG collection is assumed to be equal to that of <br />production (Figure 2). <br />Foothill Sanitary Landfill 6 Public Works/Solid Waste <br />LFG CS Design Plan County of San Joaquin - March 10, 2005 <br />