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1 <br /> QUARTERLY SUMMARY REPORT <br /> 3�QUARTER-2001 <br /> (July-September) <br /> Tosco(76)Service Station#6981 <br /> 4707 Pacific Ave <br /> Stockton,CA RWQCB Offim Central Valley Reaon Saaameoto Branch <br /> COUNTY: San Joan= <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/viells. Submitted additional subsurface <br /> investigation(borings/wells)report date 11/15/99. USTs and product piping removed and samples Collected in April 20, <br /> Approximately 100 cy of soil was over-excavated from the product piping1dispenset areas. Submitted USflline ft'I110V2� and <br /> sampling report dated 8/29/00 . Pulsingof the VES w)initiated in November 1996. VES was not pttlsT iu April <br /> July 2000(UST removal and electrical service rerouted). through <br /> RECENT QUARTER ACTIVITIES: Monitored and sampled groundwater monitotin wells. <br /> system. Prepared and submitted the quarterly summary report. Received agency a g Replaced hloarer and restarted <br /> replace existing Catox system with carbon. g approval to install C-Sparge system and to <br /> NEXT QUARTER ACTIVITIES: Monitor and sample groundwater monitoring wells. Prepare and submit quarterly <br /> summary and system reports. Prepare new system design and modifications and submit for construction bids. Submit systems <br /> to agency for approval. Install and operate C-Sparge system. Replace existing Catox system with carbon, <br /> CHARACTERIZATION/REMEDIAL STATUS: <br /> Soil contamination delineated? <br /> Dissolved ground water delineated? yes <br /> Free product delineated? Yes <br /> Amount of hydrocarbon contaminant recovered <br /> this quarter? <br /> 1 (lbs.) <br /> Soil remediation in progress? <br /> anticipated start? yes <br /> anticipated completion? 9/94 <br /> unknown' <br /> Dissolved/free product remediation <br /> in progress? <br /> anticipated start? no <br /> anticipated completion? <br /> Approximately 14,794 pounds of TPHg and 183 pounds of benzene have been extracted through 2Q01. <br /> CONSULTANT/CONTRACTOR: <br /> 140124.gs�e, Gettler Ryan InC <br />