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C. ESTIMATED CLEANUP TIME FOR TARGET OBJECTIVES Based on estimated initial removal rates and a time-averaged removal rate of 15% of the initial rate, the following periods for remediation of vadose zone and groundwater media were calculated Estimated Initial Estimated Affected Mass Removal Rate Remediation Media lbs lbs/hr ears Soil (Vadose) 20,479 208 082 Groundwater 1 162 0 049 1 278 Note * The conservative groundwater clean-up estimate is based solely upon expected diffusion rates Biodegradation effects were not modeled Based on the site variables and stated assumptions, the total system operation time required for the remediation of the site is estimated to be approximately 2 8 years (2 years, 10 months) These calculations are considered to be somewhat conservative(i e , may overestimate the required period of remediation) because they do not account for biological degradation of the hydrocarbons D. ESTIMATED COSTS TO ACHIEVE TARGET OBJECTIVES The estimated costs to achieve the remediation objectives are based on the capital equipment and iinstallation cost as well as the operation, monitoring and performance costs which are presented in the work plans and cost proposals included in Section IX The well installation costs estimated for the 12 additional AS wells and three (3) additional SVE wells are $37,846 The equipment procurement and installation costs estimated for this system are $149,335 Operation and maintenance (O&M) costs are estimated to be $132,771, for the first year Based upon the emissions concentrations, the annual O&M costs will be revised for subsequent years of operation Operations costs are expected to drop rapidly after the first year, depending upon the rate of decline in hydrocarbon concentrations from the SVE System The estimated costs were determined with respect to the UST Cleanup Fund Cost Guidelines (10/01/01) Representative bids were obtained when applicable and the following assumptions were maintained • No equipment replacement costs were included • Under normal operating conditions,biweekly O&M visits (every 2 weeks)will be performed on the system • As long as the monitoring equipment is operating properly, emissions monitoring (with laboratory analysis) shall only be performed quarterly • System emissions limitations will be set by the San Joaquin County Air Pollution Control District IV-2