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1.0 PRELIMINARY CLOSURE PLAN REVISION 1.1 Introduction The following Preliminary Closure/Post-Closure Maintenance Plan Revision (PCPCMPR) for Forward Landfill (FL) updates the existing Preliminary Plan prepared by Bryan A. Stirrat & Associates, Inc. (BAS), Lewis Engineering, and Geologic Associates (GLA) (2002). The PCPCMPR includes amendment language regarding the phased closure (partial closure) of the site including the associated reduction to the maximum extent of the landfill ever requiring closure, as well' s, the accompanying closure cost estimate. Pursuant to CCR Title 27 §21790(a), tie purpose of this Preliminary Plan is to provide a basis to establish a preliminary estimate of closure costs and post-closure maintenance costs for the landfill. The existing Preliminary Closure and Post- Closure Maintenance Plan meets this requirement; however, the objective of this PCPCMPR is to identify the information to gain agency approval. The information listed below is included in this PCPCMPR: • Engineering Design Plans (Closure Sequencing Plans) presenting the anticipated staged closure of the FL, which also shows existing and proposed final limits of waste placement (liner area); • An estimate of the maximum extent of the landfill that will ever require closure at any given time during the life of the landfill based on the Staged Closure Sequencing Plans; • Anticipated closure schedule for the initial closure stage based on volumetric calculations; and • A revised closure cost estimate based on the maximum extent of the landfill ever requiring closure as based on the Closure Sequencing configuration. 1.2 Closure Sequencing The staged closure of the FL will be performed in accordance with the applicable regulatory standards included in 27 CCR, Chapters 3 and 4 and 40 CFR, Subpart F. The closure sequencing for the Fl-will be implemented in eight stages (Stages I through VIII) as shown on Figures 1 through 8. The closure cost estimate is described in Section 1.8 of this document. The components and systems required for the staged closure of the FL include the final grading plan, final cover design, drainage, erosion and landfill gas system modifications as well as site security. A description of these closure components, as well as a schedule for construction of the final closure stage, is presented in the following subsections. 1 Forward Landfill-PCPCMPR (1:\Allied\2003.003 Western Region\FORWARD\PCPCMPR\FinalCPR.doc)