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1 <br /> Site Background Information <br />' Former TRACY DINER <br /> 95 West 11" Street, Tracy, California <br />' The former Tracy Diner is situated at the Intersection of West 11" Street and Adams Street in a <br /> business/agricultural area of central Tracy, California The site is located in an area of low <br />' topographic relief,at an elevation of approximately 18 feet above mean sea level(MSL),as depicted <br /> on the Tracy Quadrangle (7 5-Minute USGS Topographic Series, 1968, photo revised 1976, see <br /> Figure 1) The prominent features on the subject property are Illustrated on Figure 2 <br /> 1 <br /> REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br />' The site Is located within the northern San Joaquin Valley,which comprises part of the Great Valley <br /> Geomorphic Province of California The San Joaquin Valley is formed by the Great Valley <br />' geosyncline a large, elongate, northwest-trending, asymmetric structural trough bordered by the <br /> Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra <br /> Nevada to the east This trough has been filled with sediments derived from both marine and <br />' continental sources The thickness of the sedimentary fill ranges from thin veneers along the valley <br /> edges to greater than 20,000 feet in the south central portion of the valley The sedimentary <br />' • formations vary in age from Jurassic to Recent, with the older deposits being primarily marine in <br /> origin and the younger deposits continental Continental-derived sediments were primarily deposited <br /> in lacustrine, fluvial, and alluvial environments from the mountain ranges surrounding the valley <br />' (Olmsted and Davis, 1961) The site is located on unconsolidated and semi-consolidated alluvium, <br /> lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, <br /> 1977) <br />' Based on Information gathered during quarterly monitoring events, ground water depth at the site <br /> ranges from 9 feet to 12 feet below surface grade(bsg),and flows toward the southeast,but this may <br />' be modified by changing recharge and discharge patterns (Lanes of Equal Depth to Groundwater <br /> Sprang 1996, San Joaquin County Flood Control District and Water Conservation District <br /> [FCD&WCD]) <br /> I <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> A gasoline underground storage tank (UST) reportedly operated on the site for approximately <br />' 30 years, from 1940 until 1970 The UST system is assumed to have been removed after 1970, <br /> however, no records of the UST removal are available with the Tracy Fire Department, Tracy <br /> Building Department, or the San Joaquin County Environmental Health Department (EHD) <br /> I <br /> Advanced GeoEnvu onmental,Inc <br />