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Site Background Information <br /> VAN BUSKIRK GOLF COURSE <br /> 1740 Houston Avenue,Stockton, California <br /> The Van Buskirk Golf Course is located at 1740 Houston Avenue,Stockton,California(Figure 1). <br /> The golf course is located in the incorporated City of Stockton.The golf course is situated along the <br /> south side of Houston Avenue and is bound on the east by Interstate 5,Walker Slough to the south, <br /> and open-space to the west.The maintenance facility site is located on the south central portion of <br /> the golf course. <br /> The maintenance facility site consists of a maintenance shop structure, storage shed, and open <br /> storage <br /> area(Figure 2). In addition,the facility formerly operated two fuel USTs and fuel dispensers. The <br /> USTs formerly located at the site consisted of a 550-gallon gasoline tank and a 1,000-gallon diesel <br /> tank. <br /> REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> The property is situated within the Great Valley Geomorphic Province of California, a large, <br /> elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been <br /> filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly flat- <br /> lying alluvial plain,extending from the Tehachapi Mountains in the south to the Klamath Mountains <br /> in the north.The western and eastern boundaries of this province are the California Coast Range and <br /> the Sierra Nevada,respectively. Rocks composing the basement complex of the province have not <br /> been completely defined but are believed to be of metamorphic and igneous origins. The northern <br /> and southern portions of the Great Valley Province have been designated the Sacramento and San <br /> Joaquin Valleys,respectively. <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying recent alluvium are the <br /> principal source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest <br /> surface water feature in the vicinity of the property is the San Joaquin River approximately one-half <br /> mile south of the site. <br /> GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based on data acquired from a previous investigation at the site,the estimated depth to ground water <br /> in the vicinity of the site is 10 to 12 feet below surface grade(bsg).Based upon data obtained from <br /> nearby sites,the prevailing ground water flow direction in the vicinity of the site is estimated to be <br /> north to northeast. However, flow direction may be both locally and seasonably variable. <br /> Advanced GeoEnvironmenba,Inc. <br />