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k9 KL ElNFELDER 2. SITE SETTING 2_1 SITE LOCATION The site is located in the city of Tracy, California, San Joaquin County and is situated west of MacArthur Drive and south of Valpico Road. The property lies within the SE 1/4 of the NE 1/4 of Section 4, T3S, R5E, MDB&M. According to the 1981 photorevised U.S. Geological Survey "Tracy, California" 7.5-Minute Topographic Quadrangle Map, the property has an elevation of approximately 115 to 120 feet above mean sea level. 2_2 CURRENT SITE USE AND VICINITY CHARACTERISTICS The subject site is somewhat rectangular in shape and includes approximately 16.5 acres. Currently, the eastern portion (approximately 50%) of the site is being utilized as an apricot orchard. The north-western portion was formerly agricultural fields but has now been developed into a water retention basin. The remaining south-western portion of the site is now partly covered by construction fill from near-by developments and is utilized as a place for construction debris piles. The northern boundary of the site is defined by an irrigation canal. A single structure on the property is characterized as a large garage or barn, and is located centrally at the northern portion of the site. A large soil pile covers a large central portion of the site west of the orchard, extending from the southern boundary to just south of the garage building. • In general, the area surrounding the subject site is fallow and agricultural land. 2.3 GEOLOGIC SETTING 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 represents, 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 20-4202-0I.P02i2018R669 Pau 3 of 14 0 1998.Kleinfelder,Inc. October 28, 1998