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1 <br /> �i Site Background Information <br /> ' FAST AND EASY MART <br /> 244 West Harding Way, Stockton, California <br /> ' The site is bordered on the north by Harding Way,with residential properties on the south and west <br /> and commercial properties on the east. A single structure, utilized as a gasoline station and mini- <br /> mart, occupies the southern portion of the site. Two underground storage tanks (USTs) were <br /> removed from the site in September 1998 by Stockton Service Station Equipment(SSSE)and a new <br /> UST system was installed in December 1998. <br /> ' REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS <br /> The site is situated within the Great Valley Geomorphic Province of California, a large, elongate <br /> ' northwest-trending, asymmetric structural trough. The Great Valley Province has been filled with <br /> thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying <br /> alluvial plain,which extends from the Tehachapi Mountains in the south to the Klamath Mountains <br /> ' in the north. The western and eastern boundaries of this province are comprised of the California <br /> Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the <br /> province have not been completely defined but are believed to be of metamorphic and igneous <br /> ' origin. The Great Valley Province has been subdivided into two major divisions, identified as the <br /> Sacramento and San Joaquin Valleys. <br /> The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The closest <br /> ' surface water feature atthe site is Smith Canal and Yosemite Lake,located approximately 1,500 feet <br /> northwest of the site. Water from Smith Canal drains into the San Joaquin River Deep Water <br /> Channel and is primarily used for commercial and recreational boating. <br /> PREVIOUS INVESTIGATIONS <br /> ' It is the understandingof Advanced GeoEnvironmental, Inc. AGE that environmental site <br /> (AGE) <br />' assessment was performed on the property in early 1996.Field observations indicated that petroleum <br /> hydrocarbons may have impacted the soil. One soil sample collected from 40 feet below surface <br /> grade (bsg) had detectable concentrations of petroleum hydrocarbons. Two ground water samples <br /> had low concentrations of volatile aromatic compounds;one of the ground water samples collected <br /> and analyzed contained total petroleum hydrocarbons quantified as gasoline (TPH-g) at a <br /> concentration of 0.28 milligrams per liter(mg/1). Methyl tertiary-butyl ether(MTBE)was detected <br /> at 3.7 micrograms per liter (p.g/l). <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />