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Remedial Action Plan and Further Site Assessment 10 <br /> 7-Eleven Store No 19976 1399 N Main St Manteca CA May 30 2006 <br /> 53 Monthly O&M Costs <br /> Operation and maintenance costs include monitoring of influent and effluent concentrations and flowrates <br /> as required by operating permits, checking system function and adjusting flowrates and intake levels as <br /> ' necessary to optimize system performance and efficiency, applicable laboratory charges for analysis of <br /> samples to ensure permit compliance, utility costs, technical oversight of system operation, costs to <br /> prepare reports as required for the various regulatory agencies having jurisdiction over system operation <br /> and site remediation Monthly operation and maintenance costs also include carbon unit changeout as <br /> necessary, disposal costs of used materials, and routine equipment maintenance and minor repairs <br /> Although the length of remediation cannot be accurately predicted, the unit cost per month can likely be <br /> estimated to vary between $5,000 and $15,000, based on use of carbon and the changeout rate <br /> Groundwater monitoring costs are not included in operation and maintenance cost calculations <br /> 54 Life-Cycle O&M Costs <br /> The life-cycle cost of each option represents the combined capital, installation, and monthly operation and <br /> p <br /> maintenance costs for the total length of remediation, which is assumed for cost comparison purposes as <br /> two years, barring any additional releases Results of total cost comparison (life-cycle) are shown on <br /> Figure 5 for the supplemental methods, overall cost to closure including the interim method is estimated at <br /> $800,000 to $1,000,000 <br /> �F <br />