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Site Background Information MOORE TRUCK LINES 3400 Newton Road, Stockton, California BACKGROUND The site is presently operated as a short-haul trucking and truck repair facility with an office, loading dock and distribution center on the property (Figure 2). Four USTs were in use at the site for approximately 37 years. Below is presented a summary of site background information including setting, ground water depth, flow direction, well surveys, tank removal and site assessment. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located in an area of low topographic relief. According to Geologic Map of California,published in 1966 by the California Department of Conservation Division of Mines and Geology, the site area is shown to be within the Great Valley Geomorphic Province (GVGP) of California, a large, elongate,northwest trending structural trough. The GVGP is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys, which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying alluvial plain extending 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. 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 surface water feature in the vicinity of the property is the Stockton Diverting Canal approximately 2,300 feet southwest of the site. GROUND WATER DEPTH AND FLOW DIRECTION Based on data acquired from previous site investigations, the estimated depth to ground water at the site is approximately 64 feet below surface grade (bsg). Based upon data collected from the site and a nearby site, the prevailing ground water flow direction is estimated to be northeast at an average gradient of 0.0007 ft/ft. PREVIOUS INVESTIGATIONS • Two 5,000-gallon USTs (Nos. 1 and 2), one 12,000-gallon UST (No. 3), one 500-gallon UST (No. 4), product piping and associated dispensers were removed from the site on 13 January 1999. Reportedly, one 5,000-gallon tank and the 12,000-gallon tank contained Advanced GeoEnvironmental,Inc.