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S E C 0 R <br /> 0 QUARTERLY MONITORING AND <br /> REMEDIAL PERFORMANCE SUMMARY REPORT <br /> Second Quarter 2005 <br /> 76 Service Station No 11192 <br /> 1403 West County Club Boulevardr. <br /> Stockton, California <br /> City/County ID Stockton <br /> County San Joaquin ; <br /> SITE DESCRIPTION <br /> s <br /> 1 <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 <br /> PREVIOUS ASSESSMENT h <br /> Based an 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) w <br /> A <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 of minor <br /> concentrations of benzene and ethylbenzene in a 20-foot sample from boring MW-3, soil w® <br /> samples did not contain petroleum hydrocarbons Groundwater samples from wells <br /> MW-1 and MW-3 contained maximum concentrations of total petroleum hydrocarbons as ,> k <br /> gasoline (TPHg) and benzene at 0 20 ppm and 0 033 parts per million (ppm), <br /> respectively (IT, Site Assessment Report, June 1990) <br /> Between April and July 1991, IT oversaw the installation of three monitoring wells (MW-5 ' <br /> 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 petroleum hydrocarbons, except for TPHg in the 20-foot samples from borings <br /> MW-7 and VW-2 (550 ppm), and a relatively minor concentration of benzene in MW-7 <br /> Petroleum hydrocarbons were not detected in groundwater samples except for relatively , <br /> minor concentrations of TPHg in well MW-7 (IT, Interim Assessment Report, October �"V <br /> 1991) <br /> E <br /> } <br /> d <br /> I IConocoPhiiiipslRetai Sdes1111921QSSR1200512Q2005 QSSR and QRPS doc ' <br />