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5:23 PM 10/30/2024 3 of 6 <br />UNIT COSTS <br />FINAL COVER <br />LEACHATE CONTROL IMPROVEMENTS <br />LFG MONITORING AND CONTROL INSTALLATION <br />GROUNDWATER MONITORING SYSTEM <br />Assume no new groundwater monitoring wells will be installed at closure. Exisitng will be used <br />DRAINAGE AND EROSION SYSTEM <br />SECURITY INSTALLATION <br />STRUCTURAL REMOVAL <br />DECOMMISSION OF ENVIRONMENTAL MONITORING / CONTROL SYSTEMS <br />SURVEY MONUMENTS <br />Costs prorated from recent landfill design and CQA <br />t t CONTINGENCY <br />Title 27 Section 21820 indicates that costs be increased by 20% for contingency. <br />Aerial topographical survey with 2-foot intervals. <br />Scalehouse, office and maintenance building may be removed in the final development of the site, but not as part <br />of closure. Scales to serve the landfill in the last development phase will be removed in closure. <br />Dismantling of environmental control system are not planned. <br />Existing survey monuments on site will be maintained and used for differential settlement surveys. <br />PROFESSIONAL SERVICES DESIGN AND CQA <br />Prepare Final Closure and Post Closure Maintenance Plan for RWQCB and CalRecycle <br />Prepare closure construction drawings, specifications, and contract documents. <br />Fencing will be placed around the entire site as it is developed. The cost for closure includes approximately 1000 <br />feet of fencing replacement. <br />Table 2 (Continued) - Notes <br />Unit costs are based on recent construction projects at North County Sanitary Landfill and Foothill Landfill. <br />Final closure project will include approximately 185 acres. Assume evapo-transpirative closure consisting of an <br />additional three feet of soil over existing two feet of interim cover (total depth = five feet). All soils from on-site <br />sources. Limited onsite soil testing indicates soils are silty/sandy, and suitable for evpotranspiration layer. <br />Strata are consistent at site. <br />Leachate system will be installed as each module is constructed, therefore not part of closure construction. Cost <br />shown in this table covers inspection and any repairs of the pumping and removal facilities, as needed. <br />Monitoring - Existing perimeter migration monitoring wells will be used.LFG System- Existng Gas Collection system will be used. Additional LFG extraction wells to be placed in the last <br />module. <br />Before closure site will be fully developed to handle stormwater discharges. Stormwater will be discharged into <br />existing wetlands. During closure existing stormwater facilities will be used. <br />N:\1North County\CalRecycle-LEA\JTDs\2024 Rev\Appendices\Appendix B - Closure PCMP\NC PCPCMP 10-30-2024 Prelim Clos Cost 2024