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Site Background Information VANCO TRUCK&AU0 PLAZA 1033 West Charter Way, Stockton, Callfornia BACKGROUND The site is situated in an area of mixed commercial and fight 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 Califomia;.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 lbordered 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 de bed 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,continen I.Continental-derived sediments were typically deposited in lacustrine, fluvial, and alluvia environments with sediment,sources being the mountain ranges surrounding the valley( Imsted and Davis, 1961);the site itself is located on unconsolidated-and semi-consolida ed alluvium, lake, playa, and terrace deposits of-,Quaternary age (California Division .f Mines and Geology, 1977). Rocks composing the basement complex of the Province iave not-been completely defined, but are believed to be metamorphic and igneous in origin. The Modesto, Riverbank,and Turlock Lake Format ons 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 c epth to ground water at,the site is approximately.20 feet to 25 feet,below surface gr ade (bsg) based on information from quarterly monitoring events performed by AGE at, he 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 Advanced GeoEnvironmental,inc.