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' SECTION 2 <br />' BACKGROUND INFORMATION <br /> This section discusses the general setting and history of the property, and <br /> provides information on the local geography, geology, and hydrology <br /> 1 <br /> Site Location and History <br />' The property is situated within the port area of the City of Stockton, San <br /> Joaquin County, California (Figure 1-1) The Stockton Deep Water <br /> Channel bounds the property immediately to the north Ground surface <br /> elevations range from a few feet above mean sea level along the Stockton <br /> Channel waterfront to approximately 10 feet above mean sea level along <br />' West Weber Avenue <br /> Limited historical information is available for the property The earliest <br /> record, circa 1917, indicates that the area was a rail yard owned by the <br /> Atchison, Topeka and Santa Fe Railroad By 1963, the rail yard had been <br /> replaced by warehouses The warehouses at Former Tank Sites #1 and #2 <br /> have been vacant in recent months, and were demolished earlier this year <br />' Geologic Setting <br /> tThe property lies within the Great Valley geomorphic province of <br /> California The Valley is an asymmetric synclinorium containing up to <br />' 60,000 feet of sediment along the western margin The sediments consist <br /> of marine and non-marine late Triassic to early Tertiary clastic material <br /> Late Tertiary to Present Age sediments are exclusively of non-marine <br /> clastic deposition in a variety of alluvial-fluvial environments The <br /> present day surface outcrop of geologic units in the Stockton area reflects <br /> the Late Tertiary alluvial valley fill derived from the San Joaquin River <br /> rThe fill probably extends to a depth of several hundred feet <br /> Site-specific geologic information in the vicinity of the property is limited <br /> to the stratigraphy that was encountered during investigations of the <br /> former tank sites Three general soil types were encountered The first <br /> 2-1 <br />