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<br />Preliminary Closure and Postclosure Maintenance Plan 3-4 Department of Public Works/Solid Waste <br />North County Recycling Center and Sanitary Landfill County of San Joaquin <br /> <br />Revegetation will use native grasses as defined by the soil conservation service. For <br />postclosure maintenance, the following activities are proposed. This schedule may be adjusted <br />to coordinate the WDRs in force at the time: <br />• Schedule annual review of planting for erosion control, and repairs where needed, no <br />later than June 1st of each year. <br />• Schedule completion of the revegetation and landscaping work no later than <br />October 30th of each year. <br />• Perform annual routine maintenance of the vegetated layer, including repair of <br />damage caused by erosion or sedimentation, and periodic fertilization as necessary. <br />The County may choose to mow or to graze the cover to facilitate inspection for cracks and for <br />fire prevention. <br />3.3.4 Inspecting and Maintaining the Final Grading <br />To maintain final grading: <br />• Erosion damage will be repaired as needed. <br />• Slopes will be inspected annually at the end of the rainy season. If repairs are <br />needed to fill low spots or slope grade reversals, this will be accomplished during the <br />summer before the onset of the next rainy season. <br />• Slopes will be monitored to ensure that grades promote positive drainage and <br />prevent ponding or grade reversals in drainage facilities. <br />3.3.5 Settlement <br />Provisions will be made so that settlement can be measured and monitored throughout <br />postclosure. These include installation of at least two permanent monuments at the site, and <br />taking aerial topographic survey of the site upon completion of closure, and as needed <br />throughout the postclosure maintenance period. <br />An iso-settlement map can be produced showing the change in elevation from the map <br />produced upon closure and the most recent topographic map, with a contour interval of 2 feet <br />sufficient to allow early identification of differential settlement. Where it appears that slope <br />reversal is imminent or has occurred, regrading will be completed. <br />A record of these surveys and maps will be prepared and submitted to the appropriate <br />regulatory agencies throughout the postclosure maintenance period. <br />3.3.6 Operations and Maintenance for LFG Migration Monitoring and Control System <br />The existing landfill has an LFG migration monitoring and control system comprised of 20 <br />monitoring wells at minimum 1,000-foot centers along the monitoring perimeter of the landfill <br />(Figure 3). On-site structures, if any, will also be monitored. This system will remain in service