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` E C 0 R <br /> { <br /> QUARTERLY MONITORING AND x <br /> REMEDIAL PERFORMANCE SUMMARY REPORT <br /> First Quarter 2005 <br /> 'd <br /> i <br /> 76 Service Station No 11192 <br /> 1403 West County Club Boulevard <br /> Stockton, California <br /> y <br /> City/County ID Stockton <br /> County San Joaquin <br /> SITE DESCRIPTION <br /> The site is located at 1403 West Country Club Boulevard in Stockton, California and is <br /> an operating 76 service station The operating facility consists of a station building, a car <br /> wash, an auto service bay, an oil change building, four dispenser islands, a canopy, <br /> three 10,000-gallon gasoline underground storage tanks (USTs), one waste oil UST <br /> (operated by others), and associated product lines Properties in the site vicinity are <br /> primarily residential and commercial developments AX <br /> PREVIOUS ASSESSMENT <br /> Based on information by Gettler Ryan, Inc (GRI) from Tosco Corporation and BP, three <br /> 10,000-gallon USTs and four 2,000-gallon USTs were installed at the site in 1976 A soil <br /> gas survey was subsequently performed in 1989 (GRI, Groundwater Monitoring Well, <br /> CPT, and Ozone Microsparge System Installation Report, May 9, 2003) <br /> On April 26 and 27, 1990, International Technology Corporation (IT) oversaw the <br /> installation of four groundwater monitoring wells (MW-1 through MW-4) at the site The <br /> wells were installed at 30 feet below ground surface (bgs) With the exception minor <br /> concentrations of benzene and ethylbenzene in a 20-foot sample from boring MW-3, soil <br /> samples did not contain detectable concentrations of petroleum hydrocarbons <br /> Groundwater samples from wells MW-1 and MW-3 contained maximum concentrations <br /> of total petroleum hydrocarbons as gasoline (TPHg) and benzene at 0 20 ppm and 0 033 <br /> parts per million (ppm), respectively (IT, Site Assessment Report June, 1990) <br /> Between April and July, 1991, IT oversaw the installation of three monitoring wells (MW- <br /> 5 through MW-7) completed between 40 feet and 45 feet bgs, and two vapor extraction <br /> wells (VW-1 and VW-2) completed at a depth of 30 feet bgs Soil samples did not <br /> contain detectable concentrations of petroleum hydrocarbons, except for TPHg in the GF <br /> 20-foot samples from borings MW-7 and VW-2 (550 ppm) and a relatively minor <br /> concentration of benzene in MW-7 Petroleum hydrocarbons were not detected in <br /> groundwater samples except for relatively minor concentrations of TPHg in well MW-7 <br /> • (IT, Interim Assessment Report, October, 1991) g" <br /> �4 <br /> � rt <br /> Y <br /> I IConocoPhdGps\Retad Sdes1111921QSSR1200511Q2005 QSSR and QRPS doc <br /> 4' <br />