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' SOIL VAPOR EXTRACTION PILOT STUDY REPORT San Joaquin County <br /> Montgomery Ward Auto Service Center Public Health Services Department <br /> 5400 Pacific Avenue, Stockton CA Site Code 2163 <br />' <br /> Availability of space for temporaLy storage of the soil The only � r aboveground space <br /> required for this method is an area (10 ft by 15 ft ) to locate the VES unit All other <br />' appurtenances are below ground Therefore, space is not a problem and is an advantage to this <br /> method <br /> Disruption to operations As stated earlier, implementation of soil vapor extraction is not <br /> expected to pose any significant disruption to operations The only additional construction <br /> type work left to implement is the digging of trenches to connect the extraction wells to the <br /> extraction unit using buried pipe network Therefore, the VES method would be least <br /> disruptive to the day-to-day operations for the Ward facility <br /> Cost of implementation Compared to the cost of excavation and disposal, the cost for <br /> implementation will definitely be significantly lower Although exact estimates are difficult, it <br /> is expected that the implementation of VES is not expected to cost more than $250,000 <br /> I Based on the above, it is EAI's opinion that VES is the most feasible option to remediate the <br /> Ward site in Stockton <br /> 10.0 CONCLUSIONS <br /> Based on the findings of the pilot study and the feasibility study above, the following <br /> conclusions can be made <br /> ■ The radius of influence (ROI) for the VES is a minimum of 60 feet and could extend to <br /> 100 feet <br /> ■ The soil permeability of the impacted soils range from 200 to 600 darcies This is well <br /> Iwithin the acceptable range for VES to be effective <br /> ■ The initial concentrations of extracted vapors were as high as 9500 ppm by PID and <br /> 8000 ppm by laboratory analysis <br /> ■ The VES unit used on site performed satisfactorily and helped obtain sufficient data to <br /> design an optimum system for the long-term remediation program <br /> I ■ The optimum unit for long term remediation should be rated for extracting 200 to 300 <br /> scfm of vapors at a vacuum rating of 140 to 160 in WC <br /> ■ The current confiniiration of VES wells and Soil vapor probes appear to be adequate for <br /> R implementing VES for the area of impacted soils 1 1 11 1 <br /> ■ A feasibility study suggests that soil vapor extraction is the most feasible method of <br /> remediation <br /> ■ Results from a brief air sparging test suggest air sparging may be effective in treating <br /> impacted water at the site <br /> IProtect No 1232 - 17 - ENVIRONMENTAL AUDIT, INC <br />