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1-2 <br /> 1.2 Closure Sequencing <br /> The staged closure of the FL will be performed in accordance with the applicable regulatory <br /> standards included in 27 CCR, Chapters 3 and 4 and Title 40 of the Code of Federal <br /> Regulations (40 CFRJ, Subpart F. The closure sequencing for the FL will be implemented in <br /> eight stages (Stages I through VIII) as shown on Figures 1 through 8. The closure cost <br /> estimate is described in Section 1.8 of this document. The components and systems <br /> required for the staged closure of the FL include the final grading plan, final cover design, <br /> drainage, erosion and landfill gas system modifications, as well as site security. A <br /> description of these closure components, as well as a schedule for construction of the final <br /> closure stage, is presented in the following subsections. <br /> Partial final closure projects are allowed under 27 CCR, Section 21120. As described <br /> herein, eight staged closure projects will be implemented over the life of the FL with each <br /> one having a separate partial final closure plan prepared two years in advance of the <br /> anticipated closure stage. These improvements will clearly enhance landfill containment <br /> and environmental protection. A primary benefit of the partial or early closure is the <br /> reduction of potential surface water infiltration, which in turn will reduce leachate <br /> generation, as well as the related surface seeps that are sometimes observed in unclosed <br /> areas following storm events. <br /> Termination points between a given closure stage and the active fill areas will be separated <br /> by the exterior benches. The linear lout density polyethylene (I I DPP) component of the final <br /> cover system will be placed at transition peints between stages and plaeed in an aneheF <br /> treneh. When the neYA adjacent elesure stage is constructed, the upper emnal ef. the <br /> vegetative soil covering the in place LLDPE for the previous stage will be excavated baek and <br /> a new layer of LLDPE whiGh represents the start of the neYA stage will be plaGed (or shiRgied) <br /> ever the of the previous stage-LL PE and welded together-.—These interface connections <br /> between the closure and active fill areas which are not separated by an exterior bench, that <br /> is the connection which is made laterally, will be marked. Additional vegetative soil will also <br /> be placed to overlap the edge of the final cover by 10 feet. The protective soil and markers <br /> will provide adequate protection of the final cover and form a clear separation for continuing <br /> active fill operations outside the closure areas. In areas of vehicle activity, the vegetative <br /> soil overlap will be 20 feet. A final cover detail at the bench which will be typical of the <br /> termination/transition at the benches is shown on Figure 9. <br /> These OnterfaGe C-E)RneGt*ons between the elosure and aetffive fell areas whoeh are Rot <br /> marked. Additional vegetative see! will also be plaGed to overlap the edge of the final eever <br /> by 10 feet. The protective soil and madiers will provide adequate prete6tiEW-ef. the flina�l <br /> cover and ferm a elear separatiOR for eentinuing active fill operations outside the elesur-e <br /> aFeas I�Teac of vehicle aetivity, "'bb thevegetative coil Overlap will be 20 foot <br /> In addition, those interim and final drainage control structures controlling surface water run- <br /> on and/or run-off for the designated closure stages will be inspected and maintained to <br /> appropriately divert run-on and control run-off. <br /> Forward Landfill SWT Engineering <br /> PCPCMP Amendment No.4-May 2013 <br /> z:\projects\allied waste\forward\five year permit rvw 2013\jtd-5 yr pr 2013\appendices\app a-pcpcmp 2013\text\pcpcmp amend <br /> 2013.doc <br />