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5.2.2 Future Design <br />Future landfill modules will be designed per Title 27 standards and Subtitle D, and will be the <br />design responsibility of a registered civil engineer. Such designs will coordinate with the final <br />landfill configuration (Appendix B). <br />These designs will include the following: <br />• Excavation Plans <br />An excavation plan will show shows excavation grades for the module, vehicle access <br />ramps, and tie-in to existing modules. Excess soil stockpile areas are also designated in <br />the excavation plan. <br />• Composite Liners <br />The modules will be lined with composite liners consisting of a geomembrane and a <br />hydraulic barrier. The geomembrane will be a minimum 60 -mil HDPE fabric, or other as <br />approved by regulatory agencies of jurisdiction. The hydraulic barrier will be two feet of <br />10-7 cm/sec clay or approved engineered equivalent, such as a geosynthetic clay (GCL) <br />liner. <br />Liners will be installed to cover all natural geologic materials that would otherwise be in <br />contact with waste. <br />• Precipitation and Drainage Control <br />The units will be designed and constructed to limit ponding, infiltration, inundation, <br />erosion, slope failure, washout, and overtopping. <br />Diversion and drainage facilities will be designed, constructed, and maintained to <br />accommodate the anticipated volume of precipitation and peak flows from surface runoff, <br />prevent surface erosion, control and intercept run-on, and take into account planned final <br />designs. <br />" North County RC&SL Page 25 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />