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EXECUTIVE SUA MARY <br /> DRAFT FINAL REMEDIATION PLAN FOR SOIL <br /> ARCO STATION 2133, STOCKTON <br /> ARCO Products Company is remediating gasoline contaminated groundwater and proposes <br /> to remediate gasoline contaminated soil at ARCO Station 2133, located at 2908 West Benjamin <br /> Holt Drive, Stockton California. Currently a groundwater extraction system is in place at this <br /> site and has been operating since June 1991. The extracted groundwater is discharged to the <br /> sanitary sewer under a City of Stockton Wastewater Discharge Permit. A draft Final <br /> Remediation Plan addressing groundwater was prepared by Brown and Caldwell Consultants <br /> (BCC) and submitted to the San Joaquin County Environmental Health Division (County)on July <br /> 11, 1991. <br /> ARCO has completed a series of soil vapor extraction pilot tests at the site. The results <br /> of the pilot testing indicate that soil vapor extraction is a viable soil remediation alternative. Soil <br /> vapors would be extracted from a number of soil vapor extraction wells and introduced into <br /> some type of thermal or catalytic treatment system. Several types of thermal treatment were <br /> considered and catalytic oxidation is the most likely the treatment process that will be chosen <br /> for this site. The byproducts of this treatment process are water vapor and carbon dioxide gas. <br /> This FRP includes a conceptual design of the vapor extraction and treatment system and the final <br /> design phase of the treatment system will be initiated upon approval of this plan. Permits for <br /> construction and operation of the system will be pursued from the appropriate agencies including <br /> the San Joaquin County Unified Air Pollution Control District (APCD). <br /> The effluent vapors from the treatment system will be sampled and analyzed on a regular <br /> basis (sampling intervals are to be determined at a later time) to ensure the emissions remain <br /> within regulatory compliance. In addition the hydrocarbon concentrations in the vapors extracted <br /> from each well will be monitored and the vapor extraction rate will be adjusted as needed. <br /> When hydrocarbon concentrations have decreased significantly the treatment process may be <br /> modified to utilize granular activated carbon (GAC). <br /> BCBrown and Caldwell <br /> Consultants <br />