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s_ r <br /> RE <br /> WORK PLAN FOR VACUUM EXTRACTION SOIL REMEDIATION <br /> SYSTEM INSTALLATION AT FORMER EXXON REST STOP RS 7-1050 <br /> 909 WEST HAMMER LANE, STOCKTON, CALIFORNIA <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 <br /> is currently <br /> material at the Y a arevacants' lot. The surf ` <br /> _ aC � <br /> s' e <br /> site <br /> consists s o <br /> f b <br /> asphalt.. The a ars soil and patches of <br /> feet. approximate depth to groundwater is 48 to 58 <br /> I _ <br /> t <br /> BACKGROUND i <br /> In March 2990, 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 fol <br /> lowing <br /> determine whether site conditions are�amen bleatotsoil <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 de ,} f <br /> greater than 28 feet below grade in this area. <br /> p the I <br /> Teres ' t <br /> of. the. 'erformance testing indicate that the soil hcondi.tions <br /> at the site are suitable for remediation by vacuum <br /> extraction. € <br /> A proposal for an in-situ vacuum extraction: soiZ 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 p. 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 /> 3 , <br /> F ; <br /> r <br /> '' <br />