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1-2 description of these closure components, as well as a schedule for construction of the final closure stage, is presented in the following subsections. Partial final closure projects are allowed under 27 CCR, Section 21120. As described herein, eight staged closure projects will be implemented over the life of the FL with each one having a separate partial final closure plan prepared two years in advance of the anticipated closure stage. These improvements will clearly enhance landfill containment and environmental protection. A primary benefit of the partial or early closure is the reduction of potential surface water infiltration, which in turn will reduce leachate generation, as well as the related surface seeps that are sometimes observed in unclosed areas following storm events. Termination points between a given closure stage and the active fill areas will be separated by the exterior benches. These interface connections between the closure and active fill areas which are not separated by an exterior bench, that is the connection which is made laterally, will be marked. Additional vegetative soil will also be placed to overlap the edge of the final cover by 10 feet. The protective soil and markers will provide adequate protection of the final cover and form a clear separation for continuing active fill operations outside the closure areas. In areas of vehicle activity, the vegetative soil overlap will be 20 feet. A final cover detail at the bench which will be typical of the termination/transition at the benches is shown on Figure 9. In addition, those interim and final drainage control structures controlling surface water run- on and/or run-off for the designated closure stages will be inspected and maintained to appropriately divert run-on and control run-off. The landfill gas control system will be installed, as the site is developed. Permanent gas migration monitoring probes have been or will be installed prior to the closure of each staged construction period. The landfill gas system will be taken off-line and those drainage control system features over refuse will be removed while the final cover is placed and then reinstalled. The landfill gas well head stations will be extended up through the final cover through synthetic boots and then reconnected. Closure Stages Stage I was split into three separate construction stages with Stage IA closed in 2006. The Stage IA Partial Final Closure Plan/Post-Closure Maintenance Plan (Partial FCPCMP) (June 2005, BAS) provides the detailed information on the purpose and design of the Stage IA area and is included as Attachment 1. The closure of Stage 1A involved approximately 30 acres. Similar to Stage 1A, Stage 1B was closed in accordance with the Stage 1B Partial FCPCMP (June 2011, SWT) and is included as Attachment 2. Stage 1B is an approximate 20-acre slope area. This area also includes a portion of the final fill slopes on the north side of the landfill. Staged closure of the FL will be conducted throughout the development of the landfill. Subsequent staged closure dates are subject to future refuse inflow rates. Partial FCPCMPs will be submitted two years prior to reaching final fill elevations for each stage based on the refuse inflow rates for the preceding closure stage. In addition, a Construction Quality Forward Landfill SWT Engineering PCPCMP Amendment No.4-May 2013 z:\projects\allied waste\forward\five year permit rvw 2013\jtd-5 yr pr 2013\appendices\app a-pcpcmp 2013\pcpcmp amend 2013.doc