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II. Project Description ® POST-CLOSURE MARTrENANCE a As required by the California Integrated Waste Management Board(C )and the State Water Resources Control Board(SWRCB),DPW would maintain and monitor the site for a minimum of 30 years after the last phase has been closed or for as long as the waste poses a threat to public health and safety and the environment. The regulations require that financial assurances be put into place at the beginning of landfill operations to fund the closure and post-closure maintenance period adequately. The proposed leachate collection system,surface water control system,and landfill gas control system would serve the closed landfill. At some point during the post-closure period,it is reasonably foreseeable that the leachate holding facility would be closed. Until the landfill stops generating leachate,it would remain open and in use for leachate collection. Closure plans would be prepared at the time of proposed closure;these would require the approval of the Central Valley RWQCB. The time the facility would have to implement post-closure maintenance is unknown,but is anticipated to be for at least 30 years after landfill closure. The final cover,drainage system, leachate control system,gas monitoring and control system, groundwater monitoring system and final grading would be inspected once a month and after any significant storm to check the integrity and effectiveness of the above mentioned items. Repairs would be made as necessary to correct the effects of settling,subsidence,erosion or other events. Leachate quantity and quality would be monitored quarterly or whenever groundwater samples would be taken. Landfill gas would also be measured along the perimeter on a quarterly basis. Any problems would be reported to the Local Enforcement Agency )and CIWMB and actions would be taken to resolve the problem. Periodic inspections and maintenance of the slopes and vegetation in the excavated area would also be performed. While a specific proposal for the post-closure period has yet to be developed,DPW has indicated that post-closure plans would be for the site to become open space without public access. Groundwater monitoring wells would continue to be used to monitor site groundwater during the post-closure maintenance period. As part of the application for a solid waste facilities permit, the sponsor must prepare a preliminary post-closure plan. The final post-closure maintenance and monitoring plan is not required to be prepared until 24 months prior to landfill closure. 11.37