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Preliminary Closure and Postclosure Maintenance Plan 3-5 Department of Public Works/Solid Waste North County Recycling Center and Sanitary Landfill County of San Joaquin during the landfill’s 30-year final postclosure maintenance interval, unless determined by the CIWMB that migration monitoring and control is no longer necessary. Costs for expected migration control system maintenance and monitoring has been included in the postclosure cost estimate. 3.3.7 Operations and Maintenance for LFG Emission Monitoring and Control System The County plans to expand the LFG collection system into future lined areas as the landfill develops (Figure 5). These items will remain in service during the landfill’s 30-year postclosure maintenance interval, unless it is determined by CalRecycle or San Joaquin Valley Air Quality Control District that emission monitoring and control is no longer necessary. Costs for the expected LFG emission system operations, maintenance, and monitoring are included in the postclosure cost estimate. 3.3.8 Groundwater Monitoring Groundwater monitoring wells will be monitored during the postclosure period in conformance with the WDR. This planned final monitoring well network is the basis for the postclosure maintenance cost estimate. 3.3.9 Leachate Monitoring and Control The County will continue to monitor leachate quantities and quality during the postclosure period in conformance with the WDRs. Final development of the landfill prior to final closure will result in 10 leachate sumps that will be monitored in the postclosure period. This forms the basis for the postclosure maintenance cost estimate. 3.4 Postclosure Maintenance Cost Estimates Section 21840 requires a written cost estimate for hiring a third-party to maintain, monitor, and inspect the closed landfill in accordance with the preliminary Postclosure Maintenance Plan and current monitoring standards. Section 21840(b) requires a lump sum estimate of the annual cost for postclosure monitoring and maintenance in accordance with 21840(c) for the following: • Site security pursuant to Section 21135 • Maintenance and integrity of the final cover, including material acquisition, labor, and placement for repair due to settlement or erosion • Maintenance of vegetation, including fertilization, irrigation, and irrigation maintenance • Maintenance of the drainage and erosion control systems • Monitoring and maintenance of the LFG migration monitoring and control system • Monitoring and maintenance of the LFG emission monitoring and control system