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k` ■ KLEI NFFLUFR <br /> TABLE 3 <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> REGIONAL The site lies in the western part of the Great Valley Geomorphic Province <br /> GEOMORPHIC of California. The valley is 400 miles long and averages approximately 50 <br /> PROVINCE miles wide, comprises approximately 20,000 square miles. The valley has <br /> been filled with a thick sequence of marine and nonmarine sediments from <br /> the late .lurassic to Holocene. The uppermost strata of the Great Valley <br /> represents, for the most part, the alluvial, flood, and delta plains of two <br /> major rivers (Sacramento and San Joaquin Rivers) and their tributaries. <br /> The valley deposits are derived from the Coast Ranges to the west and the <br /> Sierra Nevada to the east. Granitic and metamorphic rocks outcrop along <br /> the eastern and southeastern flanks of the valley. Marine sedimentary <br /> rocks outcrop along most of the western, southwestern, southern, and <br /> southeastern flanks; and volcanic rocks and deposits outcrop along the <br /> northeastern flanks of the valley. The valley geomorphology includes <br /> dissected uplands, low alluvial plains and fans, river flood plains and <br /> channels, and overflow lands and lake bottoms. <br /> The site is located in an area characterized by alluvial fan deposits. The <br /> majority of the native sediments include a heterogeneous mix of poorly <br /> sorted clay, silt, sand, and gravel. Some beds of claystone, siltstone, <br /> sandstone, and conglomerate can also be present. <br /> DEPTH TO According to the San Joaquin County Flood Control and Water <br /> REGIONAL Conservation District map entitled, "Lines of Equal Elevation of <br /> GROUNDWATER Groundwater, Spring 1998", the groundwater flow direction of the area <br /> AND DIRECTION tends to flow towards the northwest. Groundwater is at approximately 10 <br /> OF ANTICIPATED feet below grade. General groundwater depth and flow may be influenced <br /> FLOW by local pumping, rainfall, irrigation patterns and tidal fluctuations. <br /> Evaluatioli of such factors is beyond the scope of this assessment. <br /> 20-4322-01.P01/2019R547 Page 7 of 23 <br /> Copyright 1999,Kleinfelder, Inc. June 28, 1999 <br />