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y _ Site Background Information Former OCAMPO PROPERTY 821 South Wilson Way, Stockton, California The site is located at the northeast corner of the intersection between East Taylor Street and South Wilson Way Frontage Road in the south central portion of the City of Stockton, San Joaquin County, California. It is situated in an area of mixed commercial, light industrial, and residential use. The site is currently occupied by tenants who live onsite and are involved in rebuilding vehicles and recycling. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest-tending, 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, which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of 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 Great Valley Province has been subdivided into two majordivisions, identified as the Sacramento and San Joaquin Valleys. The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal sources 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 actual depth to groundwater at the site is 40 to 45 feet below surface grade (bsg), based on the depth to water measurements from wells installed on-site. The nearest surface water feature in the vicinity is the Mormon Slough, approximately 1,200 feet south of the site. UNDERGROUND STORAGE TANK REMOVAL It is AGE's understanding that a single 550-gallon underground storage tank (UST) was removed from the site by Kleinfelder & Associates on December 18, 1985. A soil sample collected from under the UST after removal indicated that high concentrations of lead were present. Advanced GeoLnvironmental,Inc.