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0 3.2.2 FINAL COVER CONSTRUCTION <br />Clearing and Grubbing <br />Prior to final grading and placement of the final cover, all existing vegetative <br />materials will be removed from the surface without disturbing the underlying <br />refuse. All deleterious materials generated by the clearing and grubbing <br />operation will be buried in the landfill and covered with the final cover system. <br />The segregated soils will be used to construct final cover. <br />Foundation Layer <br />The two -foot foundation layer will be comprised of random onsite soils." One - <br />foot of intermediate soil will be in place over most of the refuse area at closure. <br />The in-place material (approximately one foot), utilized as part of the two -foot <br />foundation layer, will be scarified and compacted to alae -maxim um density <br />obtainable at optimum moisture using methods that are in accordance with <br />accepted engineering standards. An additional'foot of compacted soil will"be <br />placed over the in-place material. Prior to implementation of closure <br />construction, an evaluation of the existing depth of cover will be conducted. <br />Additional cover material -will be placed over the,cover-existing,at,closu4re-to <br />achieve the desired foundation layer depth (minimum two feet) and grades for <br />the final cover. <br />Low -Hydraulic Conductivity Layer <br />The proposed low -hydraulic conductivity layer will be placed directly over the <br />foundation layer. The low -hydraulic conductivity layer will consist of a VFPE liner <br />which will be installed in direct and uniform contact with the underlying <br />compacted soil layer. The geomembrane will be overlain by HDPE geosynthetic <br />drainage strips. The geomembrane liner materials are available from the <br />manufacturers and/or their designated sales representatives. <br />Erosion Control (Vegetative) Layer <br />Suitable on-site materials will be placed over the low -hydraulic conductivity layer <br />to provide a minimum two -foot -thick soil layer capable of supporting native <br />vegetative plant growth and requiring minimal maintenance. The vegetative <br />Forward Landfill PCPCMP 3-4 <br />L:\Allied\2000.193\Reports\FinaIPCPCMP:FL-sec3: 8/20/01 BRYAN A. STIRRAT s ASSOCIATES <br />