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r: 11 The refuse fill height for each module will be assessed during the design of each module based on refuse slope stability. In addition, geometric constraints, such as adequate top deck size for truck traffic and potential soil stockpiling, will be evaluated. 6.4. LEACHATE COLLECTION AND REMOVAL SYSTEM Future modules will be designed to include leachate collection systems. Leachate collection systems will consist of a network of piping surrounded with drainage gravel. The pipe network is equipped with riser pipes for inspection and cleaning if necessary. Leachate drains through the pipe network toward a leachate sump which will include sensors and an automatic pump. Leachate will be pumped to a leachate storage tank from which it will be returned to the active lined landfill module(s). 6.5. SURFACE DRAINAGE PLANS The preliminary plan for final surface drainage is shown in the Site Development Plans located in Appendix C. Temporary drainage will be managed as described in Section 7.7.5 of this JTD. As the landfill surface changes over time and as deemed necessary the county, the County will design and construct temporary surface water drainage features to control runoff and erosion. Erosion control on surfaces that have reached their near final elevation will be provided by establishing vegetation and constructing drainage berms or benches to direct stormwater away from refuse fill areas to the existing stormwater facilities (Appendix N). 6.6. GAS MANAGEMENT PLAN A conceptual landfill gas (LFG) system was prepared for the landfill site and included in the Project Design Report dated August 31, 2004 (Appendix J). An application for Authority to Construct was submitted April 5, 2005 (Appendix O). These documents present a preliminary design, subject to revisions in final design. Foothill Sanitary Landfill JTD Page 35 of 62 Public Works/Solid Waste County of San Joaquin — Revised 10/6/05