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Site Background Information <br />Former OCAMPO PROPERTY <br />821 South Wilson Way, Stockton, California <br />The site is located at the northeast corner of the intersection between East Taylor Street <br />and South Wilson Way Frontage Road in the south central portion of the City of Stockton, <br />San Joaquin County, California. It is situated in an area of mixed commercial, light <br />industrial, and residential use. The site is currently occupied by tenants who live onsite and <br />are involved in rebuilding vehicles and recycling. <br />REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br />The site is situated within the Great Valley Geomorphic Province of California, a large, <br />elongate, northwest-tending, asymmetric structural trough. The Great Valley Province has <br />been filled with thick sequences of sediment ranging in age from Jurassic to Recent, <br />creating a nearly flat-lying alluvial plain, which extends from the Tehachapi Mountains in <br />the south to the Klamath Mountains in the north. The western and eastern boundaries of <br />this province are comprised of the California Coast Range and the Sierra Nevada, <br />respectively. Rocks composing the basement complex of the province have not been <br />completely defined but are believed to be of metamorphic and igneous origin. The Great <br />Valley Province has been subdivided into two major divisions, identified as the Sacramento <br />and San Joaquin Valleys. <br />The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are <br />the principal sources of domestic ground water in the 13,500-square mile San Joaquin <br />Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San <br />Joaquin River. The actual depth to groundwater at the site is 40 to 45 feet below surface <br />grade (bsg), based on the depth to water measurements from wells installed on-site. The <br />nearest surface water feature in the vicinity is the Mormon Slough, approximately 1,200 <br />feet south of the site. <br />UNDERGROUND STORAGE TANK REMOVAL <br />It is AGE's understanding that a single 550-gallon underground storage tank (UST) was <br />removed from the site by Kleinfelder & Associates on December 18, 1985. A soil sample <br />collected from under the UST after removal indicated that high concentrations of lead were <br />present. <br />Advanced GeoEnvironmental, Inc.