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Preliminary Postclosure Maintenance Cost Estimate <br />(continued) <br />Items <br />Quantity <br />Units <br />Unit Cost <br />Annual Cost <br />SETTLEMENT ANALYSIS <br />1 <br />LS <br />$3,600 <br />$3,600 <br />DECOMMISSIONING <br />1 <br />LS <br />$0 <br />$0 <br />Subtotal <br />$20,100 <br />ESTIMATED POSTCLOSURE COST <br />$519,200 <br />CONTINGENCY (20%) <br />$103,800 <br />TOTAL ESTIMATED ANNUAL COST <br />$623,000 <br />TOTAL COST OVER 30 YEARS <br />$18;690,000 <br />Notes: <br />AC = acre <br />CY = cubic yard <br />LS = lump sum <br />SF = square foot <br />All costs are in 2008 dollars; comparative bid prices for postclosure items are adjusted for 3 percent per year inflation. <br />Analytical costs for leachate, and water quality are based on current (2007 - 2008) quarterly sampling constituents, at average <br />$200 per analysis; 5 year groundwater COCs are not included. Technician labor cost = $80 / hour. <br />FINAL COVER MAINTENANCE — Soil replacement includes onsite soil excavation, haul, and placement. <br />Excavation and haul $1.50/CY UCB soil excavation <br />Soil placement and compaction $1,50/CY UCB earthfill <br />$3.00/CY Double cost due to limited quantity use $6.00/CY <br />Seeding and mulching - $3,500/AC UCB hydroseeding. Increase 50% for smaller areas to be revegetated. <br />$3,500 x 1.5 = $5,250; use $5,500/AC. <br />Mowing - $200/AC. <br />LEACHATE MANAGEMENT - It is anticipated that each module will gravity drain to a sump. It is anticipated leachate will <br />accumulate within each sump and be pumped as needed, and sampled annually. Assume 4 technician hours per sample, <br />Sampling cost = (4 hr)($80/hr) = $320 each sample. Analysis costs = $200 per sample (see notes above). <br />LFG MIGRATION MONITORING AND CONTROL SYSTEM - Assume one technician samples in two -8 hour days per quarter. <br />Sampling 18 wells for TO -14 analysis quarterly. Includes 10 VOC analysis semi-annually. <br />Sampling cost = 2 x 8 hr x 4 qtrs x $80/hr = $5,120; call $5,200. Analysis cost = LS lab price. <br />LFG EMISSION MONITORING AND CONTROL SYSTEM - See Page EA for cost analyses. <br />GROUNDWATER AND SURFACE WATER SAMPLING - Assume 4.0 technician hours per sample. Assume quarterly sampling <br />for groundwater and annual for surface water (See Page E-5: 4 hrslsample x $80/hr = $320). <br />VADOSE ZONE SAMPLING - Assume 7.5 technician hours per sample. Assume annual sampling <br />(See Page E-5: 7.5 hr/sample x $80/hr = $600). <br />DRAINAGE - Inspect semiannually, repair as needed, one technician at 8 hours per inspection. Maintenance and repair at 5% of <br />closure cost for drainage system. (8 hr x 2 events x $80/hr + 0.05 x $125,000 = $7,500). <br />PCMP for NCRCSL E-2 Department of Public Works/Solid Waste <br />0: ISan Joaquin CountyINCRCSL 11180401 PCPMPIFinal ReportIPCPMP D R6. Doc County of San Joaquin - Rev. 02, July 10, 2009 <br />