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Table 1 (continued) <br />Preliminary Closure Cost Estimate <br />Foothill Sanitary Landfill <br />San Joaquin County, California <br />Revised 3/15/2017 <br />FINAL COVER - Assumes 4.5 feet ET cover over existing vegetated 18 -inch thick (minimum) intermediate cover. <br />ET cover thickness over existing cover (FT) 4.5 <br />Volume of ET cover needed (CY) 4,893,200 <br />Sources of Costs: <br />1. From North County Area 5 bid for surface preparation (2015). <br />2. From Foothill Area 2A bid for earthfill (2015). <br />3. From Foothill Landfill Area 2A bid for hydroseeding (2015). <br />MONITORING SYSTEM <br />4. Based on three -probe soil gas monitoring wells installed in 2015. <br />5. Assume two additional groundwater monitoring wells will be required at closure. Cost from Gregg Drilling, current in <br />2015. <br />6. 2015 cost for one Module's lysimeters shown. However, the leachate system and underlying pan lysimeter will be <br />installed as each module is constructed and will not be part of closure. Assume repair to previously -installed pan lysimeter <br />equipment to beequivalent to one com tete Ean I simeter system. <br />LFG CONTROL - a portion of the above -ground LFG system will be replaced during closure <br />7. Disabling and rebuilding of LFG field components, based on 2015 construction costs. <br />8. Horizontal LFG collectors will be installed during refuse fill, and will not be part of the closure project. <br />SITE IMPROVEMENTS <br />9. Based on 2015 Foothill Area 2A construction project. Drainage structures will include perimeter ditching and graded <br />drainage swales on the landfill sideslopes and perimeter of slope The top and sideslope swales are 11,000 feet long, and <br />the perimeter ditches are 21,000 feet long. Ditches and detention basins within the 200 -foot -wide setback area will be <br />constructed as an element of each adjacent module, not in closure. <br />10. Jan 2017 prices. Approximately 2,500 feet of aluminized steel chain link fence, 6 feet tall with barbed wire at top. Note: <br />most fencing will be placed around the entire site as it is developed. <br />11. Assume four survey monuments will be installed at closure at $6,000 each, from Andregg Feb 2017. <br />12. 2015 prices, including foundation and structures. Approximately 5,500 square feet of 4" concrete slab plus above- <br />ground structures. Removal of scalehouse, office and maintenance buildings included in LF -2 cost tables. <br />13. No dismantling of environmental controls stems Elanned for closure. <br />PROFESSIONAL SERVICES <br />14. Engineering design based on the total 2017 updated construction cost of $21,788,557 (this table). <br />15. From Andregg Aerial Topographic Services, in 2015. <br />16. CQA based on updated construction cost. <br />Foothill Sanitary Landfill San Joaquin County DPW - Solid Waste <br />\\PWVMPF01\sharesWaint-Ops\OSolidWaste\Engineering\1 Foothill\CalRecycle\2017 JTD Revision\2017 March WDR Revs\2017-3-15 PCPCMP Revised 3/15/2017 <br />