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5.2.4.2 PROPOSED FINAL COVER DESIGN <br /> The final cover will be designed by a registered civil engineer in accordance with <br /> state and federal regulations and will be constructed in accordance with an <br /> 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.,propos.ed.is presented as Detail 7-on <br /> Drawing 6 and Details 1 and 2 on Drawing 7. The final cover consists of the <br /> following components, from bottom toaop: <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 contralandfil gas <br /> migration, and to separate the waste from vectors. Because the containment <br /> system includes a composite liner system with a geomembrane at the'bottorn <br /> of the landfill, the final cover system will include a very flexible polyethylene <br /> (VFPE) geomembrane barrier layer overlain with HDPE geosynthetic drainage <br /> strips. This final cover layer is equal to the least permeable component of the <br /> 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 /> Forward Landfill JTD 5-7 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-5.0:08/22/01 <br /> BRYAN A.STIRRAT& ASSacIATES <br />