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cl "s <br /> A <br /> QUARTERLY SUMMARY REPORT <br /> Texaco Service Station <br /> 440 West Charter Way, Stockton, California <br /> San Joaquin County <br /> Third Quarter, 1994 <br /> HISTORY OF INVESTIGATIVE AND REMEDIAL ACTIONS <br /> In October 1988, two pump islands were removed and the area underneath one island was <br /> excavated In May 1989, an initial subsurface investigation consisted of the drilling of fifteen <br /> soil borings and one angle boring Eleven groundwater monitoring wells (MW-1 through MW- <br /> 11) <br /> W- <br /> 11) were installed into eleven of the fifteen borings A soil vapor extraction pilot test was <br /> conducted in May 1991 using monitoring wells MW-1 , MW-4, and MW-5 to extract vapors <br /> Wells MW-2, MW-3, and MW-9 were used as vapor monitoring points Vapor extraction lines <br /> laid beneath the station building prior to building remodeling were also tested Four nested <br /> vapor extraction wells were installed in April 1992 A soil vapor extraction pilot test using the <br /> vapor extraction wells was conducted in June 1992 Five additional groundwater monitoring <br /> wells (MW-13 through MW-17) were installed in September 1993 An interim soil remediation <br /> work plan, application to construct, and permit to operate a soil vapor extraction and emission <br /> control system (thermal/catalytic oxidizer) was submitted in September and approved in <br /> November 1993 <br /> WORK PERFORMED DURING THIS QUARTER <br /> Quarterly groundwater monitoring and sampling was performed Construction commenced for <br /> the installation of a vapor extraction system using a thermal oxidizer <br /> CHARACTERIZATION STATUS <br /> The extent of petroleum hydrocarbons in soil and groundwater has not been delineated <br /> Commingling hydrocarbon plumes with adjacent properties appear to exist <br /> REMEDIATION STATUS <br /> A soil vapor extraction and emission control system is being installed at the site <br /> WORK TO BE PERFORMED NEXT QUARTER <br /> Continue quarterly monitoring and sampling to record fluctuations in groundwater elevation and <br /> hydrocarbon concentrations Finish installing vapor extraction system in October then operate <br /> equipment after permit to operate is received <br /> COMPANY CONTACT Dave Heinrich (916) 966-8130 <br /> V 1RA0_QSR1440WC QSR <br />