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K L E i N F E L D E R M 2 SITE SETTING ' 2.1 SITE LOCATION ' The site is located in Township 1 North, Range 6 East, in Tract D of Section 16, Mount Diablo Baseline and Meridian according to the 1968 (photorevised 1987) U S Geological Survey "Stockton West, California" 7 5-Minute Topographic Quadrangle Map Because the subject site ' lies within the part of the "Campo De Los Francis" Spanish land grant the Township information was interpolated The property is located at an elevation of approximately 5 feet above mean sea level (msi) The property is located at 2711 Navy Drive, Stockton, California(Plate 1) ' 2.2 CURRENT SITE USE AND VICINITY CHARACTERISTICS ' The site is occupied by The Learner Company, and consists of an office, warehouse, two shops, and large yard area where scrap metal is stored The site is bordered to the north by Western Pacific ' railroad, to the south by Port of Stockton property, to the west by Navy Drive, and to the east by industrial facilities The surrounding areas are industrial and commercial 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 nvers (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 According to the "Geologic Map of the San Francisco-San Jose Quadrangle," 1990, (California Department of Conservation, Division of Mines and Geology), the site is underlain by Quaternary, Pleistocene to Holocene, alluvial fan deposits consisting of gravel, sand, silt, and clay, known as the Modesto Formation (Qm) ' 20-2322-05 E01/2011R061 Page 2 of 14 Copyright 2001,Klemfelder,Inc January 12,2001