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2 SITE SETTING 2.1 SITE LOCATION kTJ K L E I N F E L D E R The site is located in the northwest quarter of Section 3, Township 2 South, Range 7 East, Mount Diablo Baseline and Meridian according to the 1952 (photorevised 1987) U.S. Geological Survey "Manteca, California" 7.5 -minute topographic quadrangle map. The property is at an elevation of approximately 40 feet above mean sea level (msl). The site is located on the southwest corner of Highway 99 and Yosemite Avenue (See Plate 1, Site Location Map). 2.2 CURRENT SITE USE AND VICINITY CHARACTERISTICS The project site is currently an automobile sales lot, showroom, and service garage. The site is bordered to the north by a East Yosemite Avenue. The site is bordered to the south by the newly developed Spreckels Park. The site is bordered by Highway 99 to the east. To the west of the site is commercial development. 2.3 REGIONAL GEOLOGY AND HYDROGEOLOGY The site lies within 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. Review of the California Division of Mines and Geology "Geologic Map of the San Francisco — San Jose Quadrangle," indicates that the site is underlain by Quaternary alluvial fan deposits. According to the San Joaquin County Flood Control and Water Conservation District, Spring 1999, Groundwater Report, the depth to groundwater in the area of the subject site is approximately 20 feet below the ground surface, as shown by the Lines of Equal Depth to 20-3978-03.CHEV / ST02R111 Page 3 of 18 Copyright 2002, Kleinfelder, Inc. July 1, 2002