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C All modules will have an LCRS. LCRS systems must be designed to: (1) handle twice the peak leachate flow rate and (2) 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 perimeter 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. 2.2 Maximum Area Requiring Closure The maximum amount requiring closure at any time is 185 acres, which is the entire permitted landfill footprint (Figure 3). This acreage is therefore used in the closure and postclosure maintenance cost estimates included in this PCPMP. The County may elect to perform partial closure of areas as the landfill is developed and will submit partial 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 landfill will involve removal of the recycling center and associated ancillary structures to allow development of Modules 11 and 12. These structures may be removed as an element of a partial closure, although removal will occur with the development of the modules on whose footprint the structures now reside. Demolition costs are included in the closure costs. 2.4 Decommissioning of Environmental Control Systems Internal soil gas wells SG -5, -6, and -7 will be decommissioned prior to module construction and overfilling with refuse. Decommissioning will be as approved by the applicable regulatory agencies. At this time, it is anticipated that the boreholes will be redrilled and the resulting hole filled with concrete slurry or other approved fluid. Soil gas well SG -4 will be retained for VOC sampling, if required. All other environmental control systems will remain operable, subsequent to the completion and closure of the landfill. The groundwater, vadose, and surface water monitoring systems will continue to be monitored during postclosure. The leachate monitoring and control system will be operated, maintained, and monitored during postclosure. The landfill gas (LFG) control system to be installed within the modules will also be operated, maintained, and monitored through the postclosure period. 2.5 Closure Descriptions Section 21790 (8)(A) through (F), requires Preliminary Closure Plans to provide a preliminary description and schedule for the elements discussed in the following subsections. PCMP for NCRCSL 2-3 Department of Public Works/Solid Waste O.ISan Joaquin CountylNCRCSL11180401PCPMMFinal RepornPCPMF Rev_Jan_2010.Doc County of San Joaquin —January 7, 2010