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settlements of the subgrade soils and the refuse. Similarly, with appropriate load <br /> checks to eliminate large void-promoting wastes, the effects of any voids at the <br /> base of the intermediate liner system will be minimized and the integrity of the <br /> landfill containment system will be maximized. <br /> Permanent monuments will be installed in accordance with 27 CCR, Section <br /> 20950 to provide both horizontal and vertical control points to monitor <br /> settlement of the final site face during the post-closure period. In addition, an <br /> aerial photographic survey will be conducted of the entire landfill at final closure <br /> to produce a map with a maximum contour interval of two feet and scale of one <br /> inch equal to 100 feet in accordance with 27 CCR, Section 21142. In <br /> accordance with 27 CCR, Section 21142, an aerial photographic survey will also <br /> be produced every five years throughout the post-closure maintenance period in <br /> order to update the original topographic map produced at closure. From this <br /> information, an iso-settlement map will be produced showing the changes in <br /> elevation between consecutive aerial surveys of the landfill. <br /> 5.3.5 LEACHATE GENERATION <br /> The LCRS calculations for the Forward Landfill development include calculations <br /> for LCRS lateral spacing based on infiltration modeling (HELP3), pipe capacity <br /> based on tributary flows, and LCRS pipe wall thickness based on deflection <br /> analysis (see Appendix D). The sections that follow present the background and <br /> results for the LCRS calculations. <br /> Leachate Generation Analyses <br /> Modeling of potential leachate generation within the entire planned vertical and <br /> horizontal landfill expansion was completed using the United States Army Corps <br /> of Engineers HELP3 (Hydrologic Evaluation of Landfill Performance, Version <br /> 3.06). This modeling simulated a refuse fill placed over the entire liner <br /> development system, including liner placed over existing wastes. Input and <br /> output files are included as Appendix D. The calculated rate of leachate <br /> generation and accumulation were the primary parameters used in designing the <br /> LCRS. <br /> Forward Landfill JTD 5-21 <br /> L-\Allied\2000.193\Reports\JTD-PC PCMP702 Sec-5.0:5/24/02 <br /> Revision 1:07/16/02 <br /> BRYAN A.STIRRAT a ASSOCIATES <br />