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.. *i Site Background Information LARRY'S AUTO 308 North Grant Street, Stockton, California The site is located in a commercial area of low topographic relief in central Stockton, on the northeast corner of the intersection of Grant Street and Miner Avenue.The site is currently operated as Larry's Auto Repair and was formerly operated as De Rollo Mazda. The property is occupied by a single building with attached canopy and a parking area. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest-trending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly flat- lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are formed by the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water feature in the vicinity of the property is the Little Connection Slough, immediately west of the subject property. UNDERGROUND STORAGE TANK REMOVALS On 24 April 1987,one 1,000-gallon gasoline underground storage tank(UST),designated Tank A, was removed from the northwestern comer of the site. One 1,000-gallon gasoline UST and one 1,000-gallon diesel UST (Tanks B and C, respectively) were removed from beneath the sidewalk at the southeastern corner of the site on 25 May 1990.Petroleum hydrocarbons were detected in soil samples collected beneath all three tanks. On 19 October 1988, one 300-gallon waste oil UST (Tank D) was removed from the site near the northern property line and the canopy. Only low concentrations of trichloroethane (TCE) and chloroform were detected in the sample collected from beneath the UST. Advanced GeoEnvironmental,Inc