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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -14- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY Future Modules 55. Future module development will be in a sequential, counter -clockwise order. Each new module will be constructed in advance of filling the prior module to final refuse grade. The latter will occur before filling of the new module begins. Existing facilities in the eastern area of the site (e.g., MRF and gas wells SG -5, 6 and 7) will be decommissioned prior to development of that area. 56. The Discharger plans to construct future modules consistent with existing approvals for Module 4, or as separately proposed and approved for a new module. Specific designs and construction plans will be submitted for approval as each module is proposed for development. Construction Specifications D.1 through DA of these WDRs require that new modules be constructed in accordance with either the Title 27 prescriptive standard design or the approved EAD and performance demonstration for Module 4. Construction Specification DA further allows for the Executive Officer to approve less than significant changes to these designs, but requires Board approval of substantive changes. Vertical Expansion Plan 57. The JTD submitted by the Discharger incorporates the Discharger's Vertical Expansion Plan (VEP) for the landfill (December 2007 report 30% Design Report for Vertical Expansion of the North County Recycling Center and Sanitary Landfill, prepared by Shaw Environmental, Inc.). Vertical expansion is proposed as a component of a revision of the Facility Operating Permit. The VEP would increase the height of the landfill modules as follows: Module Fill Elevation, Feet MSL1 Fill Thickness, Ft 1,2 Avg. Base Previous Maximum Proposed Maximum 1 87 190 235 148 3 65 190 2303 165 4 64 190 300 228 5-11 66 190 320 254 1. Maximum elevation includes cover material. 2. Maximum difference between proposed final grade and base elevation contours. 3. Fill height reduced from 260 feet MSL based on results of geotechnical analysis (see Finding 58). Existing Modules 1 through 4 would be filled to the proposed maximum fill thickness (148 — 228 ft MSL) prior to filling at Module 5, which, in turn, would then be filled to its maximum thickness (254 ft MSL) before initiating operations in Module 6, and so on.