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I I ' Site Background Information VAN BUSKIRK GOLF COURSE ' 1740 Houston Avenue, Stockton, CaEifornia ' The Van Buskirk Golf Course is located at 1740 Houston Avenue, Stockton, California(Figure 1). The golf course is located in the incorporated City of Stockton. The golf course is situated along the south side of Houston Avenue and is bound on the east by Interstate 5, Walker Slough to the south, ' and open-space to the west. The maintenance facility site is located on the south central portion of the golf course. ' The maintenance facility site consists of a maintenance shop structure,storage shed,and open storage area (Figure 2). In addition, the facility formerly operated two fuel USTs and fuel dispensers. The USTs formerly located at the site consisted of a 550-gallon gasoline tank and a 1,000-gallon diesel tank. ' 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, extending from the Tehachapi Mountains in the south to the Klarnath Mountains in the north. The western and eastern boundaries of this province are 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 designatedthe Sacramento and San Joaquin Valleys, respectively. ' The Modesto, Riverbank and Turlock Lake Formations andv rl o e yang recent alluvium are the principal source of domestic ground water in the 13,500-square-mule 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 San Joaquin River approximately one-half mile south of the site. ' GROUND WATER DEPTH AND FLOW DIRECTION Based on data acquired from a previous investigation at the site,the estimated depth to ground water ' in the vicinity of the site is 10 to 12 feet below surface grade (bsg). Based upon data obtained from nearby sites, the prevailing ground water flow direction in the vicinity of the site is estimated to be north to northeast. However, flow direction may be both locally and seasonably variable. 1 I ' Advanced GeoEnvironmental,Inc. 1