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Preliminary Closure and Post-Closure Maintenance Plan Foothill Sanitary Landfill 1.0 INTRODUCTION 1.1 General The Foothill Sanitary Landfill (FSL) is single Class III solid waste disposal unit located 17 miles east of Stockton in San Joaquin County (County), and consists of 880 acres, which includes 80 acres located in Calaveras County. Of the 800 acres in the County, 674 acres are designated for disposal activities. This site is comprised of Assessor's Parcel Numbers 093-43-01 and 093-44-02. The site is located in Section 12 and 13, T2N, R9E, Mount Diablo Base Meridian (Figures 1 and 3). The land surrounding Foothill Sanitary Landfill is zoned for agricultural use and classified as natural vegetation. A few residences are within 2 miles of the landfill property (Figure 4). Foothill Sanitary Landfill consists of an unlined module (Module "I") near the center of the parcel, Modules 1, 2A, and 2B that have been constructed with a Subtitle D compliant liner system, and future modules are to be equipped with liner systems in accordance with the regulations applicable at that time. Presently, ten modules are contemplated; however, the size, location, and number of the modules will be determined by the County in consideration of the refuse inflow rate, available funds for construction, and other planning criteria. For the purposes of this Preliminary Closure and Post-Closure Maintenance Plan (PCPCMP) all ten modules are assumed to have been constructed and filled at the time of final closure. The site was originally owned and operated by Nomellini Construction starting in 1965. The site was acquired by San Joaquin County in 1993 and has been operated by Foothill, Inc. under an agreement with San Joaquin County since that time. 1.2 Purpose of This Document This document is an update of the 2020 Preliminary Closure and Preliminary Post-Closure Maintenance Plans. The intent of this document is to comply with Sections 21790 and 21825 of Title 27, California Code of Regulations that specifies what information must be included in a preliminary closure and post-closure maintenance plan and how preliminary cost estimates must be developed. The purpose of the PCPCMP is to provide a reasonable estimate of closure and post-closure maintenance costs. 1.3 Update Items Update items consist of: • Updated site life estimate • Updated total available and remaining airspace • Updated preliminary closure and post-closure maintenance cost estimates