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1-1 1.0 PRELIMINARY CLOSURE PLAN AMENDMENT 1.1 Introduction The following Preliminary Closure/Post-Closure Maintenance Plan (PCPCMP) Amendment for Forward Landfill (FL) updates the existing Preliminary Plan prepared by Bryan A. Stirrat & Associates, Inc. (BAS), Lewis Engineering, and Geologic Associates (GLA) (dated 2002) and the subsequent revision submitted in 2004 (Amendment No. 2). Amendment No. 3, dated December 2008, was submitted by SWT Engineering (SWT) and approved by San Joaquin County Environmental Health Department (acting as the Local Enforcement Agency [LEA]) in January 2009. Amendment No. 2 included 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 as, the accompanying closure cost estimate. Pursuant to Title 27 of the California Code of Regulations (27 CCR), Section 21790(a), the purpose of a Preliminary Closure Plan is to provide a basis to establish a preliminary estimate of closure costs and post-closure maintenance costs for the landfill. The 2002 PCPCMP met this requirement; however, the objective of Amendment No. 2 (BAS, dated 2004) was to identify the information to gain agency approval. PCPCMP Amendment No. 3 (SWT, 2008) included engineering design plans (i.e., Closure Sequencing Plans) presenting the anticipated staged closure of the FL, which also showed 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; the 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. This 2013 Amendment (Amendment No. 4, dated May 2013) provides updated information reflecting the implementation of the Stages IA and IB closure and post-closure cost estimates prepared in compliance with 27 CCR and the subsequent reduction of the maximum extent of area ever needing closure over the active life of the landfill. The closure and post-closure cost estimates have been updated, along with supporting back-up, as part of the Five-Year Permit Review requirements. 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 Title 40 of the Code of Federal Regulations (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 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