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<br />Preliminary Closure and Postclosure Maintenance Plan 3-1 Department of Public Works/Solid Waste <br />North County Recycling Center and Sanitary Landfill County of San Joaquin <br /> <br />3.0 Postclosure Maintenance Plan <br />3.1 Postclosure Land Use <br />Section 21825 requires a description of the planned postclosure activities as a basis for the cost <br />of postclosure maintenance. Subsection (b)(1) requires that this cost estimate be in accordance <br />with Section 21190. Section 21190(b) allows use as non-irrigated open space without submittal <br />to regulatory agencies for approval. Section 21769(c)(2)(H) also allows use as non-irrigated <br />open space without submittal of maps, development features, water balance, and monitoring <br />schemes to detect penetration by precipitation. <br />The County plans to use the NCRCSL property as non-irrigated open area in the postclosure <br />period. The vegetated final cover system and the site will be monitored, inspected, and <br />maintained per the approved Final Closure and Postclosure Maintenance Plan. It is anticipated <br />that the present practice of grazing the site by sheep for vegetation control will be continued. <br />A LFG flare and/or an electrical generation facility may be constructed on site. Possible <br />locations include the south-west corner of the property and the deck of Area 1 (Figure 5). This <br />facility will be in place prior to final closure, and will be described in the Final Closure and <br />Postclosure Maintenance Plans. <br />3.2 Monitoring and Control Systems <br />The current monitoring and control systems for the landfill include the LFG monitoring and <br />control system; groundwater, surface water, and unsaturated zone monitoring systems; and the <br />leachate monitoring and control system. <br />LFG migration monitoring is provided by monitoring the perimeter migration monitoring wells. It <br />is assumed that the migration monitoring wells will continue to be acceptable in the postclosure <br />maintenance period, which require quarterly monitoring. <br />LFG migration and emissions are presently controlled by collection of LFG from wells or <br />horizontal collectors, and treatment by flaring. LFG condensate is handled as leachate per the <br />WDRs. <br />Postclosure emission and monitoring will include operation, maintenance, and monitoring <br />activities to ensure compliance with applicable San Joaquin Valley Air Pollution Control District <br />requirements, including surface emissions monitoring. <br />Groundwater, surface water, NPDES, and unsaturated zone monitoring will include all facilities <br />described in the Closure Plan. It is assumed that this monitoring and reporting will be similar to <br />those now in place, which include quarterly groundwater elevation and semiannual water quality <br />laboratory testing.