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City of Stockton - van Buskirk Park Golf Course TL 394-0074-01 <br /> July 29, 1994 Page 2 <br /> o Two soil samples from each boring and one groundwater sample from each <br /> monitoring well were analyzed for total petroleum hydrocarbons as diesel (TPH-D), <br /> total petroleum hydrocarbons as gasoline (TPH-G), and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX); and <br /> o This report was prepared to document field activities for the SITE. A site location <br /> map, site pian showing well locations, and groundwater contour map are included in <br /> this report. Final boring logs,well construction diagrams, and well development logs <br /> are included as appendices. <br /> 3.0 BACKGROUND <br /> A description of the SITE, the geologic and hydrologic characteristics, and the project <br /> history are summarized in the following subsections. <br /> 3.1 Site Description <br /> ' The Van Buskirk Park Golf Course is located in the southwest portion of the city of <br /> Stockton,California at 1740 Houston Avenue. The maintenance yard is located in the south <br /> central portion of the golf course on the north side of Walker Slough (Drawing 1). <br /> 3.2 Geologic and Hdrolo is Characteristics <br /> 3.2.1 Regional Geology <br /> The SITE is located in the northern portion of the San Joaquin Valley which comprises the <br /> southern segment of the larger Great Valley. The Great Valley is an asymmetrical synclinal <br /> trough interrupted by two major surface cross structures: the Stockton fault in the Stockton <br /> arch and the White Wolf fault in and south of the Bakersfield arch. The Stockton fault is <br /> located approximately 1/8 mile northwest of the SITE, trending northeast. <br /> The Great Valley has been filled with a sequence of older to younger alluvium of Pliocene <br /> to Holocene age which overlie sedimentary rocks of Cretaceous to Tertiary age. These <br /> sedimentary units, in turn, overlie a crystalline basement of Paleozoic and Mesozoic <br /> metamorphic and igneous rocks. The shallow subsurface geology in the SITE vicinity <br /> consists of a heterogeneous mix of gravel, sand, silt, and clay (Norris and Webb, 1990). <br />