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Repairs will likely consist of repairing erosion damage and repairing storm water control features such as culverts, down drains, and inlet and outlet structures. The repairs will either be made by County staff or by a contractor hired by the County. 3.2.3 Groundwater Monitoring Groundwater monitoring wells are durable and are not expected to have a high failure rate. Possible problems include damage by heavy equipment and possible sedimentation of the groundwater monitoring wells. These costs are included in the Post Closure Maintenance costs. During the post closure period, the County will collect samples from these monitoring points as required by the Waste Discharge Requirements, anticipated to be twice annually. At the time of monitoring the condition of the monitoring points will be noted and if a problem is observed, the County will take steps to correct the problem. These costs are included in the Post Closure Maintenance costs. 3.2.4 Storm Water and Surface Water Monitoring Points Storm water and surface water monitoring points will be monitored in accordance with the Waste Discharge Requirements. Sampling requires that water is flowing, either along the creek at the eastern edge of the property (surface water) or leaving the site from one of the discharge points (storm water). Historically, the County has been able to take no more than one of these samples annually. For the purposes of post closure cost estimates, it is assumed that the County will be able to take a similar number of samples. 3.2.5 Landfill Gas Migration Monitoring Monitoring the LFG migration monitoring system is anticipated to continue quarterly. 3.2.6 Landfill Gas Collection and Control System Operation and maintenance of the LFG collection and control system will be a substantial effort during post closure. Since FSL is a large facility, this LFG system may be staffed full-time. However, the contract signed with the LFG-to-energy developer requires the developer to operate the LFG system, with maintenance by the County. This constitutes a significant cost savings compared to previous cost estimates; however, for the purpose of postclosure cost estimates, it is assumed that the County will operate the LFG collection system (Figure B-2) throughout the postclosure period. 3.2.7 Leachate Control System Leachate will continue to be pumped from the leachate sumps and returned to the dryer, upper strata of the landfill. The County anticipates that leachate production will decrease once the landfill is covered with the ET cover. Extraction of leachate from the sumps (with subsequent Foothill Sanitary Landfill B-11 Public Works/Solid Waste Preliminary CPCM Plan County of San Joaquin — Rev July 2010