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The granular drainage material of the base LCRS will be underlain and overlain by a sheet of <br /> nonwoven geotextile filter fabric. The geotextile functions as a filter to separate and prevent intrusion <br /> of fine materials from the adjacent soils into the granular drainage material. This will allow the <br /> granular drainage material to retain its specified hydraulic conductivity by preventing clogging from <br /> piping of fines. <br /> Leachate collected within the northern portion of WMU FU-08 will drain to leachate collection <br /> header pipes at the southern edge. The leachate header pipes will be routed to temporary leachate <br /> tanks until they can be connected to the permanent LCRSs in the southern portion. <br /> Specifications for the granular drainage material, coarse gravel, HDPE pipe, and geotextile are <br /> included in Appendix C. Quality assurance testing of the LCRS materials is outlined in the CQA <br /> Manual (Appendix D). The testing includes particle size and hydraulic conductivity for the granular <br /> drainage material and coarse gravel and manufacturer's certification of material properties for the <br /> geotextile. Details of the composite liner and LCRS components are shown on the Construction <br /> Drawings in Appendix A. <br /> 5.3 Protective Operations Layer <br /> A protective operations layer will be placed above the base LCRS to protect the LCRS, pipes, and <br /> composite liner from construction and operations traffic. The protective operations layer will consist <br /> of a minimum 12-inch-thick layer of generally sandy material excavated from onsite stockpiles. The <br /> maximum particle size of the sandy material will be limited to 1 inch to protect the underlying <br /> geotextile or GDN from puncture. <br /> A 12-inch-thick protective operations layer will also be placed above the lining and LCRS system on <br /> the slopes, concurrently with waste placement. The side slope operations layer will be placed a <br /> maximum of 10 feet ahead(vertically)of the waste to minimize the tensile loads on the geosynthetics. <br /> The operations layer will be placed using a wheel loader, so that no equipment loads are exerted on <br /> the liner. Forward has previously used a Caterpillar 966F wheel loader to place operations layer on <br /> the WMU slopes. <br /> Specifications for the protective operations layer are included under general earthwork(Appendix C). <br /> WMU FU-08 REPORT 5-7 <br />