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Page 44 Closure And Post-Closure After reaching capacity, the landfill would be formally closed. Closure typically consists of installation of a final cover over the landfill,for which the final design is a 24-inch foundation layer,a 12-inch compacted material layer with a permeability of 1 x 10-6 cm/sec,and a 12-inch vegetative/topsoil layer. Post-closure maintenance is required by the CIWMB and the SWRCB for a minimum of 30 years after closure of the last phase of the landfill,or for as long as the waste poses a threat to public health and safety and the environment. The regulations require that financial assurance be put into place at the beginning of landfill operations to fund the closure,-md post-closure period adequately. The proposed leachate collection system,surface water control system,and landfill gas control system would serve the closed landfill. The leachate holding facility would remain open until the landfill stops generating leachate. The final cover,drainage system,leachate control system,gas monitoring and . 0 control system,groundwater monitoring system and final grading would be inspected once a month and after any significant storm. Repairs would be made as necessary. Leachate quantity and quality would be monitored quarterly or whenever groundwater samples would be taken. Landfill gas would be measured along the perimeter on a quarterly basis. Periodic inspections and maintenance of the slopes and ' vegetation in the excavated area would also be performed. PERMITS REQUIRED FROM OTHER AGENCIES Several local,state,and federal agencies exercise discretionary approval over the expansion of the landfill either directly throw� the issuance of permits or indirectly through the development of design and operational guidelines. .These are summarized below. The Austin Road Landfill is currently regulated under two operating permits: the Regional Water Quality Control Board(RWQCB)issued Waste Discharge Requirements,and the California Integrated Waste Management Board(CIWMB)issued Solid Waste Facility Permit. San Joaquin Courtly Board of Supervisors-The landfill would revert to County jurisdiction when privatized,and would require a Use Permit,General Plan Amendment,and rezoning. The County Board of Supervisors must approve the General Plan Amendment and zone reclassification because they are legislative actions. San Joaqgin County Planning Commission n- The Planning Commission makes recommendations to the Board of Supervisors regarding zoning and conformity with the County General Plan, and has the authority to issue a Use Permit. San Joa in Cou-n—W Community Development Department-The County Community Development Department makes recommendations to the County Planning Commission regarding issuance of a Use Permit,and General Plan and zoning issues. California Integrated Waste Management Board(CIWMB)-The CIWMB is required to review and approve the Solid Waste Facilities Permit(SWFP),which regulates the manner in which the facility is to be operated,and has approved the SWFP for the Austin Road Landfill. Local Enforcement Agency LEA -The LEA would issue the SWFP and enforce its provisions. The California Integrated Waste Management Board is currently the LEA for the Austin Road Landfill,but after transfer of ownership to a private firm,San Joaquin County Public Health Services would become GRASSETTI ENVIRONMENTAL CONSULTING