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• Seismic Design The units will be designed to withstand the maximum probable earthquake without damage to the structures that control leachate, storm water, erosion, or landfill gas control facilities. • Maximum Height (Vertical Limits) At completion, the height of the landfill will not exceed 320 ft elevation without written approval by jurisdictional agencies. 5.3 CONSTRUCTION SEQUENCING PLANS The North County Landfill is currently planned to be developed in approximately eleven modules. Development of the modules would be in the sequential, counterclockwise order (Plate 6 and Appendix B, Figure 3). Detailed design plans for each module will be submitted to the appropriate regulatory agencies for review prior to the construction of each module. Because sizing of the modules is dependent on many operational issues, such as anticipated waste stream and capital cost expenditures, the actual size of each module may be adjusted by the County. 5.3.1 Excavation and Stockpiling Plans An excavation plan and a stockpile plan will be incorporated into the design of each module. Excavation plans will include the earthwork slopes and base grades, liner limits, LCRS systems, perimeter berms, haul ramps, drainage ditches and storm water basins, and locations of ancillary facilities. The stockpile plans will show the location and grading contours for temporary placement of the surplus soils. The County may seek to lease land adjacent to the landfill property for the placement of an interim stockpile for soil needed for closure. Near the end of landfill development, particularly for Module 11, stockpiling may occur on the top deck of previously constructed modules that have been filled to interim heights. Soil may also be 9 stockpiled north of the refuse fill in non -wetland mitigation areas. North County RC&SL Page 26 of 69 Public Works/Solid Waste Joint Technical Document County of San Joaquin — February 10, 2010