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2.5.10 Leachate Monitoring and Control Section 21790(b)(8)(F), requires a preliminary description of leachate monitoring control measures pursuant to Section 21160 for closure activities. Section 21160 (c) requires that during the closure/postclosure maintenance period, the owner/operator shall ensure that leachate collection and control is done in a manner that prevents public contact and controls vectors, nuisance, and odors. During the operational life of the landfill, leachate will be returned to the refuse away from potential public contact in accordance with the WDRs. It is anticipated that the practice of returning leachate to the refuse at a subsurface infusion point can be continued throughout the active life of the landfill. This practice removes the possibility of public contact. Final closure or partial closure will result in these areas being permanently closed to public access. This will ensure that the public does not contact leachate. Leachate is presently pumped from the leachate sumps either first into double -walled leachate storage tanks prior to returning the leachate to the landfill, or directly to the refuse fill for diffusion, in accordance with the WDRs. The County intends to continue return of the leachate to the refuse fill for the foreseeable future and anticipates this practice will continue during postclosure, when infiltration will measurably reduce and leachate accumulation will diminish. The design of the final closure leachate return systems will be submitted to regulatory agencies for approval with the Final Closure and Postclosure Maintenance Plan. Leachate quantities and quality is currently monitored regularly in conformance with the WDR. This monitoring will continue upon final closure and into the postclosure period. Development of the landfill prior to final closure will establish a total of seven leachate sumps operated, maintained, and monitored in the postclosure period (Drawing 2). This forms the basis for the postclosure maintenance cost estimate in Section 3.4. 2.6 Site Life and Closure Schedule Section 21780 (c)(3) requires that Final Closure Plans be submitted two years prior to the inception of closure activities. In accordance with Section 21780(d)(2), CIWMB, implementation of final closure activities can commence upon approval of the Final Closure and Postclosure Maintenance Plan. The landfill, with an average refuse -to -soil ratio of 5:1, is expected to reach capacity in 2048 as presented in the 2006 EIR, based on the estimated remaining fill capacity of approximately 35.6 million cubic yards as of March 13, 2009 (Table 1). The remaining capacity is based on PCMP for NCRCSL 2-9 Department of Public WorkslSolid Waste OASan Joaquin CountylNCRCSL111804OPCPMRFinal ReporAPCPMP Rev_Jan_2010.Doc County of San Joaquin -January 7, 2010