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Item Description Units Unit Price Quantity Total Cost <br />2 LEACHATE CONTROL SYSTEM <br />Leachate Control System <br />Components: Pump replacement. <br />Replace Pumps ls 65,000$ 1 65,000$ <br />Subtotal, Leachate Control System 65,000$ <br />3 LANDFILL GAS CONTROL AND MONITORING <br />3A Landfill Gas Control Adjustments/Addition <br />Components: Disconnection and rebuilding of entire system. <br />Construction: Partial replacement of laterals and flare improvements. No new extraction wells are anticipated. <br />Wellhead Assembly (installed)ea.1,310.00$ 100 131,000.00$ <br />4-inch HDPE Condensate Pipe (installed)lf 13.00$ 15,000 195,000.00$ <br /> 10-inch Collection Header (installed)lf 39.00$ 5,000 195,000.00$ <br />Motor Grade w/ Operator hr.319.18$ 234 74,688.47$ <br />Wheel Loader w/ Operator hr.251.95$ 234 58,956.89$ <br />Water Truck w/ Operator hr.209.50$ 234 49,023.82$ <br />Flare Improvements & Gas to Energy Station ea.122,000.00$ 1 122,000$ <br />Field CQA (20% of Construction Costs)%20%1 92,937.69$ <br />Subtotal, Landfill Gas Control Adjustments/Replacement 918,607$ <br />3B Landfill Gas Migration Monitoring System <br />It is anticipated that four new monitoring probes will be installed during closure. <br />ea.49,500$ 4 198,000$ <br />Subtotal, Landfill Gas Migration Monitoring System 198,000$ <br />4 GROUNDWATER MONITORING <br />It is anticipated that two new groundwater monitoring will be installed during closure. <br />Install new wells ea.48,200$ 2 96,400$ <br />Subtotal, Groundwater Monitoring 96,400$ <br />LEACHATE/CONTROL MONITORING, LANDFILL GAS CONTROL/MONITORING AND GROUNDWATER MONITORING <br />FOOTHILL SANITARY LANDFILL <br />Foothill Sanitary Landfill Prelim Closure-Postclosure Cost Estimate August_2025_Final.xlsx Page 4 of 15