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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 Laver <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 the maximum 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 closure 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.doc:5/21/02 BRYAN A.STIRRAT a ASSOCIATES <br />