ARCHIVED REPORTS XR0001482 - Laserfiche WebLink

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s ' QUARTERLY SUMMARY REPORT Texaco Service Station 440 West Charter Way, Stockton, California San Joaquin County Second Quarter, 1994 HISTORY OF INVESTIGATIVE AND REMEDIAL ACTIONS In October 1988, two pump islands were removed and the area underneath one island was excavated In May 1989, an initial subsurface investigation consisted of the drilling of fifteen soil borings and one angle boring Eleven groundwater monitoring wells (MW-1 through MW-11) were installed into eleven of the fifteen borings A soil vapor extraction pilot test was conducted in May 1991 using monitoring wells MW-1, MW-4, and MW-5 to extract vapors Wells MW-2, MW-3, and MW-9 were used as vapor monitoring points Vapor extraction lines laid beneath the station building prior to building remodeling were also tested Four nested vapor extraction wells were installed in April 1992 A soil vapor extraction pilot test using the vapor extraction wells was conducted in June 1992 Five additional groundwater monitoring wells (MW-13 through MW-17) were installed in September 1993 An interim soil remediation work plan, application to construct, and permit to operate a soil vapor extraction and emission control system (thermal/catalytic oxidizer) was submitted in September and approved in November 1993 WORK PERFORMED DURING THIS QUARTER Quarterly groundwater monitoring and sampling was performed CHARACTERIZATION STATUS The extent of petroleum hydrocarbons in soil and groundwater has not been delineated Cominglmg hydrocarbon plumes with adjacent properties appear to exist REMEDIATION STATUS A soil vapor extraction and emission control system is being installed at the site WORK TO BE PERFORMED NEXT QUARTER Continue quarterly monitoring and sampling to record fluctuations in groundwater elevation and hydrocarbon concentrations Finish installing vapor extraction control system equipment (July) y COMPANY CONTACT Dave Heinrich (916) 361-0614 V \RAO,QSR\44OWC QSR