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QUARTE QUAUMMRA-R REPORT <br /> (January-March) <br /> Tosco(76) Service Station#6981 <br /> 4707 Pacific Ave <br /> Stockton, CA <br /> COUNTY: San Joaquin RWQCB Office: Central Valley Region,Sacramento Branch <br /> BACKGROUND: The USTs were replaced in 1988. To date 16 onsite and 5 offsite borings have been drilled and 13 <br /> groundwater monitoring wells,one pumping test well, and six vapor extraction wells installed 1,600 cubic yards of soil were <br /> excavated and aerated. Groundwater monitoring began in February 1990. Vapor Extraction Test was performed in March <br /> 1992. A pump was test was performed in August 1992. A Vapor Extraction System (VES) was installed and operation <br /> initiated in September 1994. Abandoned wells MW-3,MW-10, MW-12, and MW-13 to facilitate re-construction of street <br /> intersection. Submitted work plan to install one offsite groundwater monitoring well and drill one soil boring in September <br /> 1997. Submitted Work Plan Addendum (dated 2/17/99) for additional borings/wells. Submitted additional subsurface <br /> investigation(borings/wells)report date 11/15/99. USTs and product piping removed and samples collected in April 2000. <br /> Approximately 100 cy of soil was over-excavated from the product piping/dispenser areas. Submitted UST/line removal and <br /> sampling report(dated 8/29/00). Pulsing of the VES was initiated in November 1998. VES was not pulsed in April through <br /> July 2000(UST removal and electrical service rerouted). <br /> RECENT QUARTER ACTIVITIES: Monitored and sampled groundwater monitoring wells. Blower on VES is broken, <br /> system not running. Prepared and submitted the quarterly summary report. <br /> NEXT QUARTER ACITNTHES: Monitor and sample groundwater monitoring wells. Prepare and submit quarterly <br /> summary report. Review remedial options to address impacted groundwater. <br /> CHARACTERIZATION/REMEDIAL STATUS: <br /> Soil contamination delineated? yes <br /> Dissolved ground water delineated? yes <br /> Free product delineated? n a <br /> Amount of groundwater contaminant recovered <br /> this quarter? 0 (gal) <br /> Soil remediation in progress? yes <br /> anticipated start? 9/94 <br /> anticipated completion? unknown' <br /> Dissolved/free product remediation <br /> in progress? no <br /> anticipated start? <br /> anticipated completion? <br /> Approximately 14,794 pounds of TPHg and 183 pounds of benzene have been extracted to date. <br /> CONSULTANT/CONTRACTOR: Gettler-Ryan Inc. <br /> 140124.gsr-er <br />