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I <br /> f <br /> WORK PLAN FOR VACUUM EXTRACTION SOIL REMEDIATION <br /> I SYSTEM INSTALLATION AT FORMER EXXON REST STOP RS 7-1050 <br /> 909 WEST HAMMER LANE, STOCKTON, CALIFORNIA <br /> INTRODUCTION <br /> i <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 /> I removed. The site is currently a vacant lot. The surface <br /> material at the site consists of bare soil and patches of <br /> asphalt. The approximate depth to groundwater is 48 to 58 <br /> I feet. <br /> I BACKGROUND <br /> In March 19901 EVAX Technologies, Inc. conducted a Soil Gas <br /> Survey to delineate the lateral and vertical extent of <br /> hydrocarbon concentration as vapor at the sub)ect site. A <br /> Performance Test was conducted the following day to <br /> determine whether site conditions are amenable to soil <br /> I 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 /> I (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 /> I <br /> I <br />