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�KL KL ElNFFLDER 2 SITE SETTING k Z.I. SITE LOCATION AND USE The site is located at the DSS Vernalis Quarry in proximity to the northeast corner of Koster Road and Interstate 580 near the southern border of San Joaquin County, California. The subject site is currently an operating gravel quarry utilized by DSS Company Inc. DSS i ongoing p y s currently proposing Phase I of on on g g gravel pit operation which involves settling ponds in proximity to the Delta Mendota Canal. Two supply wells are currently located on the property. 2.2 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, southwestern, 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, 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. 1 20-2245-36.1701/2011 R279 Page 2 of 10 Copyright 2001,Kleinfelder, Inc. March 14,2001