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Table 1 -LF -1 (continued) Preliminary Closure Cost Estimate Foothill Sanitary Landfill San Joaquin County, California Revised 3/15/2017 FINAL COVER - Assumes 4.5 feet ET cover over existing vegetated 18 -inch thick (minimum) intermediate cover. ET cover thickness over existing cover (FT) 4.5 Volume of ET cover needed (CY) None This LF is closed 1. Final surface of LF1 is closed w/ ET cap. 2. See above. 3. See above. MONITORING SYSTEM 4. Based on three -probe soil gas monitoring wells installed in 2015. for both LFs, apportioned based on footprint of this LF vs. the footprint of both LFs. 5. Assume two additional groundwater monitoring wells will be required at closure. Cost from Gregg Drilling, current in 2015. for both LFs, apportioned based on footprint of this LF vs. the footprint of both LFs. 6. L simeters not installed for LF -1 due to lack of liner. LFG CONTROL - a portion of the above -ground LFG system will be replaced during closure 7. Disabling and rebuilding of LFG field components, based on 2015 construction costs. for both LFs, apportioned based on closure area of this LF vs. the combineed closure area of both LFs. 8. Horizontal LFG collectors will be installed during refuse fill, and will not be part of the closure project. SITE IMPROVEMENTS 9. Based on 2015 Foothill Area 2A construction project. Drainage structures will include perimeter ditching and graded drainage swales on the landfill sideslopes and perimeter of slope The top and sideslope swales are 11,000 feet long, and the perimeter ditches are 21,000 feet long. Ditches and detention basins within the 200 -foot -wide setback area will be constructed as an element of each adjacent module, not in closure. for both LFs, apportioned based on closure area of this LF vs. the combineed closure area of both LFs. 10. Jan 2017 prices. Approximately 2,500 feet of aluminized steel chain link fence, 6 feet tall with barbed wire at top. Note: most fencing will be placed around the entire site as it is developed. for both LFs, apportioned based on closure area of this LF vs. the combineed closure area of both LFs. 11. Assume four survey monuments will be installed at closure at $6,000 each, from Andregg Feb 2017. for both LFs, apportioned based on closure area of this LF vs. the combineed closure area of both LFs. 12. None for LF -1. 13. No dismantlin2 of environmental control s stems elanned for closure. PROFESSIONAL SERVICES 14. Professional services for closure are not needed because final landfill surface of LF -1 is closed. 15. See above. 16. See above. Foothill Sanitary Landfill San Joaquin County DPW - Solid Waste \\PVWMPF01\sharesWaint-Ops\OSolidWaste\Engineering\1Foothill\CalRecyde\2017 JTD Revision\2017 March WDR Revs\20173-15 PCPCMP Revised 3/15/2017