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■ C NUO • <br /> � � .1NG+ SACRAMENTO <br /> 2.3 Local Geology and Hydrology <br /> The near-surface geology has been determined by the four Boles cored at'the site <br /> during the Phase II investigation. The geology beneath the site consists of sandy silts and <br /> brown clays. Small amounts of gravel.and pebbles are found throughout the unit, .which is <br /> V. <br /> consistent with the soil survey of San.Joaquin County, which describes ihersoils:at the site <br /> as Capay Clay (USDA, 1992). These are described as very deep and moderately well- <br /> drained soils. The soil has formed from alluvial derived mixed rock sources. The slopes <br /> are from zero to two percent, and runoff and permeability are.siow. <br /> Groundwater was encountered during coring at.approximately 16 to 19 feet below <br /> ground surface (bgs). However, after the split-spoon sampler was removed from the hole <br /> the static water level rose to approximately 12 feet bas, indicating confined aquifer <br /> conditions. <br /> lSurface water bodies in the vicinity of the subject site include many delta sloughs <br /> such as the Sugar Cut Slou h, LQcat. d a_ roximatel one mile to the northeast f h <br /> pP� o the site. <br /> The reported regional groundwater gradient at the site is towards the northeast'. <br /> t <br /> 4 <br />