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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -17- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY 2) Runoff from the western fill area (i.e., Modules 1 through 6) will be directed to the outboard ditch and discharged offsite via culverts previously noted (see Finding 18 and Attachment B). 62. The Discharger may propose partial landfill closure upon reaching final elevations on some, but not all modules. In such case, the Discharger will submit a partial FCPMP(s) for the modules proposed for closure in accordance with Title 27 requirements. 63. The PCP/PCMP includes a conceptual plan for the landfill cover consisting of GCL in lieu of one foot of compacted clay for the LHC layer, an engineered alternative to the prescriptive design under Title 27. The plan states that demonstration for any such EAD proposal will be included in the Final Closure Plan when it is submitted. Construction Specification D.10 requires that any such cover proposal address the requirements of Title 27 and Subtitle D, including the requirement that the cover not create a “bathtub effect”. 64. Landfill postclosure maintenance/monitoring activities will include final cover maintenance; leachate management; maintenance and monitoring of LFG facilities; groundwater, vadose zone, and surface water monitoring; maintenance of precipitation and drainage controls; and other postclosure related activities. FINANCIAL ASSURANCES Closure 65. The Discharger is required to demonstrate financial assurances (F/As) for closure to the California Integrated Waste Management Board (CIWMB) pursuant to Title 27, Section 22205, since the landfill operated after January 1, 1988. The total estimated cost of closure provided in the PCP/PCMP after vertical expansion of the landfill is $14,006,200 in 2008 dollars. The Discharger has established an enterprise fund account (San Joaquin County Resolution No. R-90-1190) funded from solid waste revenues as the mechanism for landfill closure F/A. 66. Section 22206 of Title 27 requires that the closure F/A demonstration be, at a minimum, in the amount of the current closure cost estimate. The latter is the minimum enterprise account funding balance required by the CIWMB under Section 22225 of Title 27. The following table summarizes the status of closure F/A provided to the CIWMB as of a September 2008 and F/A demonstration parameters for vertical expansion of the landfill: Parameter Closure F/A Demonstration Before Vertical Expansion1 After Vertical Expansion2 Landfill Capacity (yd3) 20,900,000 36,900,000