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KLEINFELDER <br /> 1 heterogeneous mixture of generally poorly sorted clay, silt, sand, and gravel Some beds of <br /> claystone, siltstone, sandstone, and conglomerate are also present <br /> The site near-surface geology consists of intercalated beds of heterogeneous sequences of silt, <br /> sand and gravel The origin of these deposits is from active stream channels, and silts and clays <br /> originating from overbank and marsh depositional environments <br /> ' The general direction of groundwater flow in the area of the site, based on a report issued by the <br /> San Joaquin County Flood Control and Water Conservation District, Spring 1996, Is to the east <br /> ' towards a zone of groundwater depression The elevation of first groundwater is approximately <br /> 40- to -50 feet below mean sea level According to the same report, the depth to groundwater in <br /> the vicinity of the project site 1s approximately 20 feet below grade <br /> Groundwater was Initially encountered at depths of 18 to 19 feet during the advancement of soil <br /> borings during this Investigation The groundwater depth decreased to approximately 11 feet <br /> after 2 hours The site surface elevation is approximately 8 to 10 feet above the surface of the <br /> adjacent Stockton Deep Water Channel The groundwater depth is likely influenced by the <br /> 1 Stockton Deep Water Channel tidal fluctuations <br /> i <br /> 1 <br /> 1 <br /> 20-1 129-3012017R314 Page 4 of 13 <br /> ' © 1997,Kleintelder Inc July 14, 1997 <br />