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1-3 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 twothree separate construction stages with Stage IA closed in 2006. The 2005Stage 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. Staj�e 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. GurFently, it is antieipated that the Stage 113 area will be elosed iR the near term based on refuse inflow Fates. 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 Assurance (CQA), including closure certification, will be completed for each closure stage to verify proper final closure construction. Stage I Stage I is an approximate 90.2-acre area, as shown on Figure 1. This area includes the final fill slopes on the northern and southern portions of the landfill from the edge of the base liner system up to an elevation of 150 feet above mean sea level (AMSL). The Stage I area was/will be closed in two,-three paAs-sj es (Stage IAS a d-IB, and IC). Stage IA was closed in 2006 in response to actions requested by the Regional Water Quality Control Board RW CB , Central Valley Region. A Partial FCPCMP reflecting the closure of the Stage IA area was submitted and approved by the regulatory agencies in 2005 and Stage IB was closed in 2011. The Stage IA and IB areas consisted of_-3050.2 acres, therefore, the remaining 40-60.0 acres will be closed as part of Stage tBAC closure. The closure volume estimates are based on a permitted maximum waste fill ap4e ae-elevation of X50210 feet AMSL (see JTD Drawing 3-Final Grading Plan) down to the master p! base grades (see JTD Drawing 4-Base Grading Plan). As part of this project, the area will be cleared and grubbed, as necessary, and the closure improvements constructed (e.g., final cover, permanent drainage, landfill gas system modification, etc.). --4s antiompated that Stage IB area will be closed in the neaFteFFn depending on actual refu Rflew rates expe-eneed oveF time, site conditions, and eapital expenditure tinqing-. Galoulatoens and assumptions in suppoFt of the Stage 1 Closure Area site life estimate are 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\text\pcpcmp amend 2013.doc