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X- l <br /> 2965 West Benjamin Holt Drive, Stockton, California March 16, 1994 <br /> Chevron U.S.A. Products Company Page 16 <br /> 5.5 Air Sparging with Soil Vapor Extraction <br /> Costs associated with the air-sparging-with-vapor-extraction alternative include the following: <br /> Capital Costs <br /> • Subcontractor, consulting and laboratory fees for the installation of an air sparge well <br /> • Consulting and laboratory fees for air sparge and vapor extraction pilot testing to . <br /> analyze the site-specific feasibility of air sparging as a remediation alternative <br /> Consulting and permit fees for the design of an air sparging/vapor extraction system <br /> • Subcontractor, consulting, laboratory, equipment, and materials fees-for the installation, <br /> and start-up of a combined air sparging/soil vapor extraction system with vapor <br /> abatement. <br /> '• Subcontractor, consulting and. laboratory fees for confirmation borings and additional <br /> assessment to analyze the effectiveness of remediation <br /> Operational Costs ' <br /> • Labor, consulting and laboratory fees for vapor monitoring and sampling to monitor the <br /> effectiveness of the system <br /> ■ Operation, maintenance,-and utility fees for air sparging/soil vapor extraction and vapor <br /> abatement system <br /> • Labor, consulting and laboratory fees for groundwater monitoring and sampling until <br /> closure of the project <br /> Capital costs of the air sparging with vapor extraction alternative are the highest of the four proposed <br /> E <br /> corrective action alternatives. Since soil vapor extraction is a necessity with this alternative, the cost of <br /> adding air sparging to the system is relatively low. The long-term operational costs could be the highest <br /> of the four alternatives. Operational costs could be minimized by shortening the lifetime of the project. <br /> Additional costs that must be considered are those incurred as a result of loss of business (service <br /> station operation). The extent of loss business is dependent on the interruption caused during soil vapor <br /> extraction system installation, <br /> 5073PAR.RPT '17LJ' J GROUNDWATER <br /> Imo! TECHNOLOGY <br />