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Preliminary Site Assessment Report CALIFORNIA STOP ' 2224 Manthey Road, Stockton, California ' 1.0. INTRODUCTION At the request of Ms Nhuan(Nancy)Le,Advanced GeoEnvironmental,Inc (AGE)has prepared the enclosed Preliminary Site Assessment Report for the property located at 2224 Manthey Road, Stockton, California (site) The scope of work Included advancement of six soil probe borings, collection and analysis of selected soil and ground water samples, and preparation of this report ' The work was performed as required by the San Joaquin County Environmental Health Department (EHD)by letters dated 07 March 2002 and 09 February 2005 for the investigation of an unauthorized release of petroleum hydrocarbons from the on-site underground storage tank (UST) system The location of the site and surrounding area is illustrated on Figure 1 A plan of the site, including soil boring locations, is illustrated on Figure 2 ' h Central Valley This report has been prepared in accordance with guidelines issued by the C } Regional Water Quality Control Board (CVRWQCB) for the subsurface investigation of UST systems ' 2.0. BACKGROUND The subject property is located in a commercial area of south Stockton, immediately west of ' Interstate 5 and south of West Eighth Street The property is presently utilized as a gasoline station and convenience store Three 10,000-gallon USTs, installed approximately in 1991, and one dispenser island with four dispensers are located at the site r 2 1 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 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 origins 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 ' Advanced CeoEvironmental,Inc