COMPLIANCE INFO_2021-2022 - Laserfiche WebLink

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Forward Landfill – SIR 10 www.scsengineers.com and accommodate anticipated future settlement. Construction will promote lateral surface water run- off, which will minimize settlement effects. Access roads will be used to maintain the final cover area and environmental control systems throughout the post-closure maintenance period. The final grading plan for the Site will consist of a mounded surface surrounded by a perimeter access road. Slopes of 3H:1V to 4H:1V. Furthermore, the top deck will have a minimum slope of 3 percent and a permitted maximum elevation of 210 feet above mean sea level. The final grading plan is presented in Figure 4. There are no anticipated changes to the final grading plan due to the reduction in organic waste disposal. 12 SITE LIFE ESTIMATES Section 6 includes a discussion on volumetric capacity impacts experienced by the Landfill resulting from upstream organics diversion. The table presenting the volumetric capacity calculations for the Site is included as Appendix B. The calculated waste intake due to upstream diversion equates to a reduction in yearly airspace consumption and associated increase in the life of the Landfill from 2036 to 2037. It should be noted that the actual landfill service life will be dependent on the waste quantity disposed at the Landfill during the remaining service life of the landfill. The actual disposal tonnage, and, therefore, the actual landfill service life, is influenced by many factors outside the control of the Site; such as other regional landfills’ closing dates, the nature of the wastes, waste generation rates, waste diversion rates, development activity in the region and consumer behavior. 13 ANCILLARY FACILITIES Ancillary facilities related to MSW disposal operations at the Site include the entrance facilities area, the scales and scalehouses, water production wells, support and storage areas (i.e. office training and maintenance building), a transfer station/materials recovery facility and composting facility, a groundwater extraction and treatment plant, and sedimentation basins. These facilities are not expected to be impacted by the reduction of organic waste disposal. The site also has a BFS and LFGTE facility that could be impacted due to the reduction of organic waste disposal. The potential reduction to LFG generation due to the reduction of organic waste disposal and the impacts on the Site are discussed in Section 9. 14 COST ESTIMATES FOR CLOSURE AND POST-CLOSURE 14.1 CLOSURE COST ESTIMATE Cost estimates by Lewis Engineering were prepared for the final closure of the remaining 315 acres (plan area) final footprint area in accordance with 27 CCR §21769(b)(2)(A) and §21790(b)(1). These regulations require an estimate in current dollars of the cost of hiring a third party to closure the landfill in accordance with the approved closure plan. Closure cost estimates include design, materials, equipment, labor, administration and quality assurance for closure work. The 2021 cost estimate included the assumptions that that foundation soils and vegetative cover soils will be obtained from existing stockpiles or on-site borrow sources, and that existing environmental controls such as the LFG extraction/monitoring system, LCRS system, groundwater monitoring wells and other environmental control features are already in place and will not require significant upgrades