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' • h" KLEINFELDER 2 SITE SETTING 2.1 SITE LOCATION The site is located in the Eastern %2 of Subsection E and the Western %2 of Subsection F of Section ' 20, Township 2 South, Range 5 East, of the Mount Diablo Baseline and Meridian according to the 1954, photorevised 1981 U.S. Geological Survey "Tracy, California" 7.5-minute topographic quadrangle map. According to the map, the property is located at an elevation of approximately 30 ' feet above mean sea level(msl). ' 2.2 CURRENT SITE USE AND VICINITY CHARACTERISTICS The project site is currently a graded field. The site is bordered to the north, south and west by ' residential housing with occasional open fields. A park is adjacent to the southwest corner of the site. The site is bordered by Corral Hollow Road to the east. 2.3 REGIONAL GEOLOGY ' The site lies near the western boundary of the Great Valley Geomorphic Province of California. The valley is approximately 400 miles long and averages about 50 miles wide, and comprises about 20,000 square miles. The valley has been filled with a thick sequence of marine and non- marine sediments from the late Jurassic to Holocene. The uppermost strata of the Great Valley represent, for the most part, the alluvial, flood, and delta plains of two major rivers (Sacramento and San Joaquin Rivers) and their tributaries. The valley deposits are derived from the Coast Ranges to the west and the Sierra Nevada to the east. Granitic and metamorphic rocks outcrop along the eastern and southeastern flanks of the ' valley. Marine sedimentary rocks outcrop along most of the western, southwestem, southern, and southeastern flanks; and volcanic rocks and deposits outcrop along the northeastern flanks of the valley. The valley geomorphology includes dissected uplands, low alluvial plains and fans, t river flood plains and channels, and overflow lands and lake bottoms. The majority of the native sediments near the site consist of Miocene to Holocene continental rocks and deposits of a heterogeneous mixture of generally poorly sorted clay, silt, sand, and gravel. Some beds of ' claystone, siltstone, sandstone, and conglomerate are also present. ' 20-4341-1 LEO 1/2011 R959 Page 3 of 31 Copyright 2001,Kleinfelder,Inc. August 21,2001