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2905 West Benjamin Holt Drive, Stockton, California March 16, 1994 <br /> Chevron U.S.A. Products Company Page 14 <br /> 5.3 Bio-Sparging <br /> Costs associated with the implementation of bio-sparging include the following: <br /> Capital Costs <br /> '• Subcontractor, consulting, and laboratory fees for the installation of a bio-sparge well <br /> • Consulting and laboratory fees for a blo-sparge pilot test to analyze the site-specific <br /> feasibility of this remediation alternative <br /> • Subcontractor, consulting, laboratory, equipment, and materials fees for the installation <br /> and startup of a bio-sparge system <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 monitoring and sampling to monitor the <br /> effectiveness of the system <br /> • Labor, consulting, and laboratory fees for groundwater monitoring and sampling until <br /> closure of the project <br /> Capital costs of bio-sparging are less than those required for the soil vapor extraction and for the air <br /> sparging/soil vapor extraction alternatives, but are greater than the capital costs for the source <br /> removal/isolation alternative. Bio-sparging avoids higher capital costs by eliminating the need for vapor <br /> extraction/destruction equipment. Operational costs are somewhat lower than soil vapor extraction <br /> and/or air sparging due to lower permit fees, equipment maintenance costs, and laboratory fees. <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 of business is dependent on the interruption caused during the <br /> bio-sparge system installation. <br /> The benefits associated with the bio-sparge remediation alternative are the removal of hydrocarbons <br /> from soil and groundwater beneath the site which reduces any liability associated with leaving <br /> hydrocarbon-impacted material in place. In addition, bio-sparging represents the lowest total cost of the <br /> hydrocarbon mass removal aeration alternatives. <br /> a es. <br /> f ` <br /> E 5073PAR.RPT <br /> GROUNDWATER <br /> �� TECHNOLAGY <br />