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3.3.5 Settlement Provisions will be made so that settlement can be measured and monitored throughout postclosure. These include installation of at least two permanent monuments for the entire site, and taking aerial photographs for a topographic survey of the entire permitted site upon completion of closure activities, and as needed throughout the postclosure maintenance period. An iso -settlement map can be produced showing the change in elevation from the map produced upon closure and the most recent topographic map, with a contour interval of 5 feet sufficient to allow early identification of differential settlement. Where it appears that slope reversal is imminent or has occurred, regrading will be completed. A record of these surveys and maps will be prepared and submitted to the appropriate regulatory agency(ies) throughout the postclosure maintenance period. 3.3.6 Operations and Maintenance for LFG Migration Monitoring and Control System The existing landfill has an LFG migration monitoring and control system comprised of 18 monitoring probes at 1,000 -foot centers along the perimeter of the landfill (Section 2.5.6). This system will remain in service 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 existing landfill has an LFG control system comprised of a number of vertical extraction wells and horizontal collection pipes. The County expects to install an extensive LFG removal system within future modules prior to closure. The County anticipates and has included costs for repair of aboveground components and well replacements in the closure costs. The overall system will remain in service during the landfill's 30 -year final postclosure maintenance interval, unless it is determined by the CIWMB or South Coast Air Quality Management District that emission monitoring and control is no longer necessary. Costs for the expected LFG emission system operations, maintenance, and monitoring has been included in the postclosure cost estimate. 3.3.8 Groundwater Monitoring As assessed in Section 2.5.7, 10 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 in Section 3.4. i PCMP for NCRCSL 3-5 Department of Public Works/Solid Waste O:ISan Joaquin CountylNCRCSL111804WCPMPIFina1 ReporAPCPMP_Rev_Jan_2010.Doc County of San Joaquin - January 7, 2010