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approved Final Closure Plan submitted two years prior to the anticipated date of <br />closure. Closure activities will then commence within thirty days following the <br />last receipt of waste and will conclude within 180 days following the beginning <br />of closure in accordance with the closure implementation requirements <br />contained in 27 CCR 21110 or in accordance with an alternate schedule <br />approved by the LEA and CIWMB and included in the approved Final Closure <br />Plan. The final cover system currently proposed is presented in Detail 7 of <br />Drawing 6 and Details 1 and 2 of Drawing 7 of the JTD. It consists of the <br />following components, from bottom to top: <br />• Two -Foot Foundation Layer <br />A minimum two -foot thick layer of approved _soil, contaminated soil, <br />incinerator ash, or other waste materials placed immediately over the entire <br />surface of the last lift of refuse. This layer shall have the appropriate <br />engineering properties, so as to provide a relatively unyielding surface upon <br />which to place the low -hydraulic -conductivity layer. <br />• Low -Hydraulic Conductivity Layer <br />This component is to provide a barrier to water infiltration through the final <br />cover system in order to minimize leachate generation, to control LFG <br />migration, and to separate the waste from vectors. Because the containment <br />system includes a composite liner system with a geomembrane at the bottom <br />of the landfill, the final cover system will include a 40 -mil very flexible <br />polyethylene (VFPE) geomembrane barrier layer, overlain with HDPE <br />geosynthetic drainage strips. This will provide a barrier layer which is equal <br />to the least permeable component of the liner system. <br />• Two -Foot Erosion Control (Vegetative) Layer <br />This component is to provide protection from wind and water erosion, to <br />provide vegetation and improve aesthetics, and to minimize long-term <br />maintenance. <br />The Final Closure Plan for the Forward Landfill will include appropriate <br />demonstrations that the engineered alternative final cover system meets or <br />exceeds the requirements of 27 CCR, Section 21090 as required by 27 CCR, <br />Section 21140. <br />Forward Landfill PCPCMP 3-3 <br />L:\Allied\2000.193\Reports\FinaIPCPCMP:FL-sec3: 8/20/01 BRYAN A. STIRRAT S ASSOCIATES <br />