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Site Background Information <br /> LARRY'S AUTO <br />' 308 North Grant Street, Stockton, California <br />' The site is located in a commercial area of low topographic relief in central Stockton, on the <br /> northeast corner of the intersection of Grant Street and Miner Avenue The site is currently operated <br />' as Larry's Auto Repair and was formerly operated as De Rollo Mazda The property is occupied by <br /> a single building with attached canopy and a parking area <br />' REGIONAL GEOLOGICIHYDROGEOLOGIC SETTING <br />' The property is situated within the Great Valley Geomorphic Province of California, a large, <br /> elongate, northwest-trending, asymmetric structural trough The Great Valley Province has been <br /> filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly flat- <br /> lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klamath <br /> Mountains in the north The western and eastern boundaries of this province are formed by the <br /> California Coast Range and the Sierra Nevada, respectively Rocks composing the basement <br />' complex of the province have not been completely defined but are believed to be of metamorphic <br /> and igneous origin The northern and southern portions of the Great Valley Province have been <br /> designated the Sacramento and San Joaquin Valleys, respectively <br /> IThe Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal source 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 nearest <br /> surface water feature in the vicinity of the property is the Little Connection Slough, immediately <br /> west of the subject property <br /> I <br /> UNDERGROUND STORAGE TANK REMOVALS <br />' On 24 April 1987,one 1,000-gallon gasoline underground storage tank(UST),designated Tank A, <br /> was removed from the northwestern corner of the site One 1,000-gallon gasoline UST and one <br />' 1,000-gallon diesel UST (Tanks B and C, respectively)were removed from beneath the sidewalk <br /> at the southeastern corner of the site on 25 May 1990 Petroleum hydrocarbons were detected in soil <br />' samples collected beneath all three tanks <br /> On 19 October 1988, one 300-gallon waste oil UST (Tank D)was removed from the site near the <br />' northern property line and the canopy Only low concentrations of tnchloroethane (TCE) and <br /> chloroform were detected in the sample collected from beneath the UST <br /> • <br /> I <br /> Advanced GeoEnvIron mental,Inc <br /> 1 <br />