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The LCRS typically consists of a one-foot thick layer of granular material graded <br /> towards a system of perforated HDPE leachate collection header pipes. The <br /> LCRS collection header pipes slope at a minimum of one percent toward the <br /> sumps. The piping and drainage layer are directly underlain by the composite <br /> liner system. A geotextile is used as a rub sheet under all pipes to protect the <br /> HDPE geomembrane liner from potential abrasion caused by the pipes. The <br /> LCRS drainage layer is separated from the operations layer above by a non- <br /> woven geotextile to prevent migration of fine-grained material into the LCRS. <br /> The LCRS design for slopes greater than 15 percent consists of a geocomposite <br /> drainage net (GDN). GDN will be used due to construction and stability <br /> concerns associated with placement of granular materials on steep slopes. The <br /> transmissivity of the GDN is specified to accommodate a minimum of twice the <br /> maximum anticipated leachate flow. No collection pipes are required on the <br /> side slopes. <br /> Leachate collected in the LCRS flows through the granular drainage layer to the <br /> pipes and subsequently into leachate collection sumps. Submersible pumps <br /> located in each sump lift leachate out of the LCRS for discharge to lined surface <br /> impoundments, from which the leachate evaporates. <br /> Of three leachate impoundments permitted, two are currently in use at the FL. <br /> WMU F North is located in the southern region of the FL site,just north of the <br /> South Creek. It was constructed in 1999 and currently provides containment for <br /> leachate from the southern waste management units. WMU F West is located in <br /> the northern portion of the site, directly west of WMU FU-03. It was constructed <br /> in 2003 and receives leachate from the northern waste management units. <br /> WMU F South is permitted for the portion of the site which lies south of the <br /> South Branch. WMU F South has not yet been constructed as there is currently <br /> no waste landfilled south of the South Creek. (see Figure 6) <br /> 4.5 CLOSURE AND POST-CLOSURE <br /> 4.5.1 CLOSURE/POST-CLOSURE MAINTENANCE PLANS <br /> A Preliminary Closure and Post-Closure Maintenance Plan (PCPCMP) was <br /> prepared to reflect the currently permitted landfill in compliance with applicable <br /> Forward Landfill-Project Description 4-15 BRYAN A.STIRRAT&ASSOCIATES <br /> (J:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Prof Descrip\021308 Final Proj Des\Sec 4.doc:2/13/2008) <br />