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1 <br />' Site Summar <br /> GREWAL'S MARKET <br />' 4100 East Fremont Street <br /> 1.0. BACKGROUND <br /> 1 The site is located at the southeast intersection of Fremont Street and Oro Avenue, approximately <br /> 500 feet east of California State Highway 99. The site is located in a topographically flat area at an <br /> elevation between 25 and 30 feet above mean sea level in eastern Stockton, California. The site is <br /> 1 within the southeast quarter of Section 30,Township 2 North,Range 7 East,Mount Diablo Base and <br /> Meridian (Stockton East Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo revised <br /> 1987). <br /> 2.0. SITE DESCRIPTION <br /> 1 The site is presently utilized as a retail fueling station, a car wash and amini-market. The site <br /> presently consists of two 12,000-gallon gasoline/diesel USTs, one mini-market building structure, <br /> 1 one car wash building structure and fuel dispensing islands under a canopied structure. <br /> lie 3.0. UNDERGROUND STORAGE TANK REMOVAL <br /> On 27 July 1998, one 6,000-gallon diesel UST, one 6,000-gallon gasoline UST, one 10,000-gallon <br /> gasoline UST and the associated fuel dispensers and product piping were removed from the site and <br /> replaced with two 12,000-gallon gasoline/diesel USTs.Laboratory analysis of soil samples collected <br /> beneath the former USTs and product piping areas detected total petroleum hydrocarbons quantified <br /> as gasoline and diesel (TPH-g and TPH-d, respectively) at concentrations as high as 12,000 <br /> milligrams per kilogram(mg/kg).Benzene,toluene,ethylbenzene and xylenes(BTEX compounds) <br /> were detected beneath the former UST and product piping areas at concentrations as high as 290 <br /> mg/kg,methyl tertiary butyl ether(MTBE)was detected in the same areas at concentrations as high <br /> as 0.80 mg/kg. <br /> 4.0. PREVIOUS SUBSURFACE INVESTIGATION <br /> 1 The following is a summary of previous investigations at the site of the unauthorized release of fuel <br /> products to the subsurface: <br /> • May 1997-Five soil borings(P-1 through P-5)were advanced near the UST area at the site <br /> to assess the lateral and vertical extent of petroleum-impacted soil as part of a preliminary <br /> site assessment. Results of the May 1997 investigation were reported by AGE in <br /> Preliminary Site Assessment, dated 06 June 1997.Xylene was detected inboring P-4(30 feet <br /> bsg) at a concentration of 0.026 mg/kg; MTBE was detected from soil samples collected in <br />