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Closure Stages Stage I was split into two separate construction stages with Stage IA closed in 2006. The 2005 Partial Final Closure Plan provides the detailed information on the purpose and design of the Stage IA area. Staged closure of the FL will be conducted throughout the development of the landfill. Currently, it is anticipated that the Stage IB elesure area will be closed in the near-term based on refuse inflow rates-2j906. Subsequent staged closure dates are subject to future refuse inflow rates. Subsequent Partial Final Closure Plans 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, 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 a 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 parts (Stage IA and IB). Stage IA was closed in 2006 in response to actions requested by the Regional Water Quality Control Board Central Valley Region. A partial final closure plan reflecting the closure of the Stage IA area was submitted and approved by the regulatory agencies in 2005. The Stage IA area consisted of 30.2 acres, therefore, the remaining 60.0 acres will be closed as part of the Stage IB closure. The closure volume estimates are based on waste fill up to an elevation 150 feet AMSL down to the master plan base grades. 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.). It is anticipated that#W-,-Sta a IB area will be closed in the near-term depending on actual refuse inflow rates experienced over time, site conditions, and capital expenditure timin . Calculations and assumptions in support of the Stage I Closure Area site life estimate are included as Attachment 1. Stage II Stage II is a 5.6-acre area as shown on Figure 2. This area includes the final fill slopes along the southern slopes of the northern portion of the landfill up to an elevation of 150 feet AMSL. The closure volume estimates are based on waste fill up to an elevation of 150 feet AMSL down to master plan base grades. 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. 3 Forward Landfill-PCPCMP Amendment (Z:\PROJECTS\Allied Waste\JN81013 5 yr Review Plan\PCPCMP Amend 3 July 08\FinalCPRRevl.doc; Amendment No.3:7/3/2 )