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WORK PLAN FOR VACUUM EXTRACTION SOIL REMEDIATION <br /> SYSTEM INSTALLATION AT FORMER EXXON <br /> ,EST STOP RS 7~1050 <br /> 909 WEST HAMMER LANE, ST <br /> IA <br /> INTRODUCTION <br /> The subject site is a former Exxon rest stop located at the <br /> northwest corner of Hammer Lane and Sacramento Road in <br /> Stockton, California. The service station structures have <br /> been demolished and the tanks and pipelines have been <br /> removed. The site is currently a vacant lot. The surface <br /> material at the site consists <br /> ofare soil <br /> aand <br /> ter patc es of <br /> asphalt. The approximate depth <br /> tog <br /> 58 <br /> feet. <br /> BACKGROUND <br /> In March 1990, EVAX Technologies, Inc. conducted a Soil Gas <br /> Survey to delineate the lateral and vertical extent of <br /> hydrocarbon concentration as vapor at the subject site. A <br /> Performance Test was conducted the following day to <br /> determine whether site conditions are amenable to soil <br /> remediation by vacuum extraction. The results of the Soil <br /> Gas Survey indicate that concentrations of hydrocarbon as <br /> vapor are located predominantly in the vicinity of the <br /> former tank cavity. Concentrations were recorded at depths <br /> greater than 28 feet below grade in this area. The results <br /> of the performance testing indicate that the soil conditions <br /> at the site are suitable for remediation by vacuum <br /> extraction. <br /> A proposal for an in-situ vacuum extraction soil remediation <br /> system and program was submitted to Exxon company, U.S.A. <br /> (Exxon) in June 1990. <br /> SYSTEM DESIGN <br /> The vacuum extraction system will extract vapor from the <br /> soil and reduce the concentration of hydrocarbons in the <br /> vapor to allow for discharge of the extracted air stream to <br /> -. .....__..... the atmosphere.- . ... _ <br />