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8 PRELIMINARY CLOSURE/POSTCLOSURE MAINTENANCE PLAN 8.1. LANDFILL CLOSURE OVERVIEW Based on the fill volume estimates presented in Section 4, the landfill is expected to be filled in 2058. It is anticipated that final closure of will be completed within 2 years after reaching full capacity. Therefore, the landfill will be closed in 2059. Portions of the landfill may be closed in advance of reaching full capacity. Two years prior to final closure, the County will submit a Final Closure Plan, identifying the work included with closure and a schedule for implementation. The County may partially close the landfill incrementally. Two years prior to the anticipated date of partial closure, the County will submit Final Closure and Postclosure Maintenance Plans for the areas being closed. The County may submit this final plan within 5 years of anticipated closure in lieu of submitting new or updated preliminary closure and postclosure plans. One year prior to closure bid documents and CQA Plan will be submitted. Within that year prior to closure, a contractor will be selected and the closure construction will start and end in one construction season. Subsequent to closure a CQA report will be submitted with as-builts to support certification of closure. 8.1.1. Preliminary Closure Costs The preliminary closure costs (Appendix I) include: • Placement of the landfill cap • Installation of the landfill gas, groundwater monitoring, and leachate control systems • Site improvements including drainage structures, security, and dismantling structures This cost estimate assumes closure is conducted by a third party contractor in 2005 dollars. This cost includes the contingency factor of 20% in accordance with Section 21820(a)(4). The Foothill Sanitary Landfill Page 58 of 62 Public Works/Solid Waste JTD County of San Joaquin — Revised 10/6/05