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� Ms Mary Ways Page 2 <br /> March 2, 1994 <br /> . 13ACGROUND INFORMATION <br /> A summary of the general site setting and history, and the local geography, <br /> geology, and hydrology is provided below <br /> Site History and Setting <br /> Historical information regarding the parcel is limited The earliest record, <br /> circa 1917, indicates that the area was a rail yard owned by the Atchison, <br /> Topeka and Santa Fe Railroad By 1963, the rail yard had been replaced by <br /> three warehouses (for additional information, see the Preliminary Site <br /> Assessment Report for Stockton Warehouses, Dames & Moore, January <br /> 1990) Currently, the warehouses are collectively under the ownership of <br /> Catellus Development Corporation, formally the Santa Fe Pacific Realty <br /> Company Two warehouses are currently under lease to two separate <br /> business enterprises, the third warehouse is vacant <br /> Geographv <br /> The site property is situated within the port area of the City of Stockton, San <br /> Joaquin County, California The Stockton Deep Water Channel bounds the <br /> property immediately to the north Elevations range from a few feet above <br /> sea level along the Stockton Channel waterfront to approximately 10 feet <br />• above mean sea level (MSL) along West Weber Avenue <br /> Geologic Setting <br /> Site-specific geologic information in the vicinity of the property is limited to <br /> that which was encountered during investigations of the former tank sites <br /> Three general soil types were encountered The first layer (encountered only <br /> at Site 2) is a thin layer of fill ranging from the ground surface to two to three <br /> feet below ground surface (bgs) The second layer, found below the fill at Site <br /> 2, and directly below the pavement at Site 1 ranges to a depth between <br /> approximately 10 and 20 feet bgs The soils in this layer consist of <br /> semiconsolidated silts and clays Below the clay/silt layer and to the depth <br /> explored (approximately 25 feet bgs), the soils consist of unconsolidated sand <br /> with minor amounts of silt and gravel <br /> Ground Water Hydrology <br /> Investigation and tank removal activities in the site area indicated the <br /> presence of confined shallow ground water conditions During drilling <br /> activities performed by ERM and previous investigators, ground water was <br /> typically encountered in borings at depths ranging from 3 5 to 19 feet bgs In <br /> these borings, ground water was generally first encountered after drilling <br /> through a silt and clay zone into sandy soils The fine-grained silts and clays <br /> generally serve to confine the ground water to the sandy soils The confined <br />