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h" KLEINFELDER 2. SITE SETTING 2.1 SITE LOCATION The site is located in the city of Tracy, California, San Joaquin County and is situated on the southeast corner of Central Avenue and Sixth Street. According to the 1981 photorevised U.S. Geological Survey "Tracy, California" 7.5-Minute Topographic Quadrangle Map, the property has an elevation of approximately 55 to 60 feet above mean sea level. The site is located within a portion of San Joaquin County Assessor's Parcel Number (APN) 235- 150-16. 2.2 CURRENT SITE USE AND VICINITY CHARACTERISTICS The subject site is triangular in shape and includes approximately 86,000 square feet. It is residential development to the situated between a commercial area to the north' dRailroadl to the north by Sixth Stoeet and to site is bordered to the south by the Southern Pacific the west by Central Avenue. The eastern portion of the site ends at about North F Street. Southern Pacific Railroad is located to east and west of the site, the surrounding western area ' including a large open field. During Kleinfelder's field work in February and March 1998, the subject site was relatively flat and open. The site was mostly covered by gravel; concrete pads and asphalt was noted in the southwestern portion of the site. i2.3 GEOLOGIC AND HYDROGEOLOGIC 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. p 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 ivalley. 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 Page 4 of 15 20-4054-01.E01/201SR299 May 8, 1998 ©1998,Kleinfelder,Inc.