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Remedial Action Plan and Further Site Assessment 9 7-Eleven Store No 19976 1399 N Main St Manteca CA May 30 2000 50 SUPPLEMENTAL REMEDIATION ALTERNATIVE COST COMPARISON Due to the general lack of Information in how much time is typical to remediate MTBE plumes, life-cycle _ costs to closure for the three supplemental remediation methods (examined as an addendum to groundwater extraction)were evaluated on a relative basis, using broad cost approximations Actual cleanup costs cannot be accurately predicted at this time Baseline assumptions Include more predictable costs for post-remediation groundwater monitoring of at least one year after cleanup operations cease, regardless of the duration or method of cleanup Results of supplemental (in addition to Interim) remediation alternative feasibility evaluation (general) and relative cost comparisons are summarized in Figure 5 51 Capital Costs Capital costs Include all in-situ and above-ground treatment equipment, including pumps, treatment equipment(volatilization equipment, carbon adsorption units, oxidization units), auxiliary blowers for air transfer, monitoring hardware (i a explosimeters, flowmeters, stripchart recorders, pressure gauges and regulators), and other materials such as piping and control valves Capital equipment costs (including the interim method)are estimated to range between $70,000 and $125,000 r 52 Installation Costs MInstallation costs include treatment compound construction and installation, subsurface Installations (system piping and utilities hookup), design drawings including electrical one-line diagrams, utilities deposits, applicable permitting costs, fees, and permit inspections Installation costs include all subcontractor fees and oversight charges System startup and trouble-shooting are also included in costs for system installation System installation costs (including the interim method) are about$60,000 (with permits included)