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SECTION®NE Introduction <br /> The predominant structures located on site include a shop building, a storage building, and an <br /> office budding There are plans for the construction of a shop building in the center of the site, <br /> near the former UST location <br /> 9.2 GEOLOGY AND HY®R®GE®LOGY <br /> Based on groundwater elevation data collected in 1997, the groundwater flow direction beneath <br /> the site is generally to the east with a hydraulic gradient of 0 003 meter per meter (0 003 foot per <br /> foot) The historic depth to groundwater ranges from approximately 50 feet below ground <br /> surface (bgs)to approximately 68 feet bgs <br /> Based on boring logs from previous investigations, the sod predominately consists of a fill <br /> material overlying alluvial deposits The fill soil was generally a sandy gravel to a silty sand and <br /> was encountered to depths of 3 and feet 15 bgs The soil was classified beneath the fill material as <br /> silty clay, clayey silt, clay, sandy silt, sandy clay, and silty sands <br /> The site is located near the center of the Great Valley of California, a geomorphic province, that is <br /> a nearly flat alluvial plain bounded on the east by the Sierra Nevada and on the west by the Coast <br /> Ranges The Great Valley is comprised of a thick sequence of sedimentary rocks of Jurassic to <br /> Recent age The Great Valley is a elongated, northwest trending, asymmetric trough with a long <br /> stable eastern shelf and a short western flank(Bailey, 1996) The Stockton Arch, an area of uplift, <br /> extends from the Sierran slope across to the western flank of the trough The uplift is thought to <br /> have occurred during Eocene tune and may have continued into the N&ocene as a result of <br /> upward movement on the south side of the Stockton fault <br /> "� ® T1199ranc09NAISTOC3mtmEPORTD=7AU[4M9730WNA%MA 1-2 <br />