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' 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 rThe 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 mayor divisions, 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) Thus basin is drained primarilyby 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 in the soil ' PREVIOUS SITE INVESTIGATIONS A soil boring was advanced at the site on November 25, 1998 by Upgradient Environmental Consultants, petroleum hydrocarbons were detected in soil samples collected from the boring Analytical results of the samples are included in Table 1 Due to the detection of contamination, a iwork plan addendum was prepared by Upgradient Environmental Consultants, and a revised ' Advanced GeoEnvironmental,Inc