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I Site Background Information ' PREM DOR 433 West Scotts Street, Stockton, California ' The site is located on West Scotts Avenue, approximately 250 feet east of the Lincoln Street intersection, in an Industrial/commercial area of West Stockton, California (Figure 2) The site is ' situated in an area of low topographic relief at an elevation of approximately 10 feet above sea level (Figure 1) The property is currently occupied by the Prem Dor Corporation ' REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest-trending, asymmetric structural trough, the northern and ' southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east The Great Valley has been filled with sediments derived from both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than �. 20,000 feet in the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits continental Continental-derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments with sediment sources being the mountain ranges surrounding the valley The site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa, and terrace deposits of Quaternary age Rocks composing the basement complex of the Province have not been completely defined, but are believed to be metamorphic and igneous in origin The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the I principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) IUNDERGROUND STORAGE TANK REMOVAL It is our understanding that two underground storage tanks (USTs) were removed from the site In March 2002 The USTs were reportedly utilized for the storage and dispensing of gasoline and diesel fuel Concentrations oftotal petroleum hydrocarbons quantified as diesel(TPH-d),gasoline(TPH-g), volatile aromatics(benzene,toluene,ethylbenzene,and xylenes BTEX),and total lead were detected in soil samples collected from the UST excavation IBased upon the analytical results of soil samples collected during UST removal, the San Joaquin • County Environmental Health Department(EHD)required the preparation of a work plan to define Ithe lateral and vertical extents of contamination in soil and ground water Advanced GeoEnv►ronmeotal,Inc