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a Items FINAL COVER INSTALLATION Preliminary Closure Cost Estimate 11 Quantity ( Units I Unit Cost I Extn Existing : Vegetative Partial Soil Cover Proposed : Prescriptive Cover (for costing) 7 EA $2,500 $17,500 1.0 Preparation for cover placement 185 ACRE $3,500 $647,500 2.0 Place GCL Barrier 8,461,500 SF $0.60 $5,076,900 3.0 Place Geocomposite Drainage Layer (over 20% of the geomembrane) 1,692,300 SF $0.60 $1,015,400 4.0 Place 1 foot Vegetative Soil Cover 470,000 CY $4 $1,252,000 5.0 Hydroseeding 185 ACRE 1 $3,500 $647,500 Final Cover Soil Subtotal 1 1 $8,639,300 LEACHATE CONTROL IMPROVEMENTS Existing : All facilities for 7 sumps in place at time of closure 7,0 Proposed : Inspect and repair all leachate removal systems 7 EA $2,500 $17,500 Leachate Control Improvements Subtotal 2 LS $10,500 $17,500 LFG MIGRATION MONITORING AND CONTROL SYSTEM Existing: All facilities are in place at time of closure 8.0 Proposed: Replacements during closure 3 Each $10,500 $31,500 LFG EMISSION MONITORING AND CONTROL SYSTEM 2 LS $10,500 $21,000 Existing � Majority of system in place 1 1 $21,000 9.1 Proposed: Disabling and Rebuilding Gas System" 1 LS $60,300 $60,300 9.2 Proposed: Well Replacement Costs` 1 LS $121,700 $121,700 LFG Emission Control System Subtotal 1 1 $213,500 GROUNDWATER MONITORING SYSTEM Groundwater Monitoring installations Existing: All facilities are in place at time of closure 10,0 Proposed: Wells replaced during closure 2 LS $10,500 $21,000 Groundwater Monitoring System Subtotal 1 1 $21,000 See supplemental LFG system cost estimates, Page D-5 PCMP for NCRCSL D-1 Department of Public Works/Solid Waste 0: I San Joaquin CountyINCRCSL 11180401PCPMPIFinal ReportiPCPMP D R6, Doc County of San Joaquin - Rev. 02, July 10, 2009