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' Site Background Information ' VANCO TRUCK& AUTO PLAZA 1033 West Charter Way, Stockton, California ' BACKGROUND ' The site is situated in an area of mixed commercial and light industrial use,bordered by Navy Drive on the north and West Charter Way on the south The prominent features of the subject property are depicted on Figure 2 REGIONAL GEOLOGIC 1 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 typically deposited in lacustrine, fluvial, and alluvial environments with sediment sources being the mountain ranges surrounding the valley (Olmsted and Davis, 1961), the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) 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 principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) The depth to ground water at the site is approximately 20 feet to 25 feet below surface grade(bsg)based on information from quarterly monitoring events performed by AGE at the site,the ground water elevation is approximately 10 feet below mean sea level(MSL) Ground water generally flows toward the northeast, however, this may vary due to local recharge and discharge patterns FUEL-DISPENSING SYSTEM UPGRADE In February 2003, as part of a fuel-dispensing system upgrade,the underground storage tank(UST) • sumps,fuel dispensers,and associated piping were excavated by the Fillner Construction Company, excavated soil was stockpiled on-site for evaluation prior to transport to Forward Landfill for Advanced GeoEnvironmental,Inc