COMPLIANCE INFO_JTD APPENDIX A -L 2024

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Preliminary Closure and Postclosure Maintenance Plan 2-3 Department of Public Works/Solid Waste North County Recycling Center and Sanitary Landfill County of San Joaquin the east; pasture on the east and west; and field crops, deciduous fruits and nuts, and livestock on the east. A number of off-site structures, including residential structures, have been built in the vicinity of the facility; however, they are beyond 1,000 feet from the facility property boundary (Figure 4). 2.1.4 Base Liner and LCRS System The design for the base liner system at the NCRCSL incorporates the engineered alternative base liner system demonstrated to be satisfactory in the Demonstration report of May 2002, with adjustments for the fill loads associated with refuse elevations to 230 ft MSL (Drawings 1, 2, and 3). These features are included in the current WDR. The liner system for Modules 3 and later includes geosynthetic clay liner (GCL), 60 mil HDPE geomembrane, and rounded drainage rock (Detail 1 on Drawing 4). The liner system for the sideslopes substitutes a geocomposite drainage layer for the rounded drainage rock (Detail 2 on Drawing 4). All areas will have a leachate collection and recovery system (LCRS). LCRS systems will be designed to remove twice the peak leachate flow rate and limit leachate head on the underlying base liner to depths of less than 1-foot (CCR Title 27, Section 2160(a)(1)). LCRS components for NCRCSL include collection pipes in troughs to intercept and carry leachate to sumps. Each leachate sump will be equipped with a removal pump with automatic controls. Leachate is removed from each sump to prevent measurable accumulation of head on the base liner (Drawing 2). 2.2 Maximum Area Requiring Closure The maximum area requiring closure at any time is 185 acres, which is the complete permitted landfill area (Figure 3). This acreage is therefore used in the closure and postclosure maintenance cost estimates included in this PCPMP. The County may elect to close portions of the landfill, and will submit partial final closure plans for review when appropriate. If partial closure projects are implemented in the future, the County will update and reduce the maximum area requiring closure at that time. 2.3 Removal of Landfill Structures Current plans for the development of the landfill include removing the recycling center and associated ancillary structures to allow development of Areas 10 and 11 and will not be included in a closure project. Closure will include removing the truck scales and scale house constructed to allow receipt of refuse for the final development phase (Figure 3). Demolition costs for those items are included in the closure costs.