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. Site Background Information Former TRACY DINER 95 West 11" Street, Tracy, California '0 The former Tracy Diner is situated at the Intersection of West I P Street and Adams Street in a business/agricultural area of central Tracy, California The site is located in an area of low topographic relief, at an elevation of approximately 18 feet above mean sea level (MSL), as depicted on the Tracy Quadrangle (7 5 -Minute USGS Topographic Series, 1968, photo revised 1976, see Figure 1) The prominent features on the subject property are Illustrated on Figure 2 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley, which comprises part of the Great Valley Geomorphic Province of California The San Joaquin Valley is formed by the Great Valley geosyncline a large, elongate, northwest -trending, asymmetric structural trough bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east This trough has been filled with sediments derived from both marine and continental sources The thickness of the sedimentary fill ranges from thin veneers along the valley edges to greater than 20,000 feet in the south central portion of the valley The sedimentary formations vary in age from Jurassic to Recent, with the older deposits being primarily marine in origin and the younger deposits continental Continental -derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments from the mountain ranges surrounding the valley (Olmsted and Davis, 1961) The site is located on unconsolidated and semi -consolidated alluvium, lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Based on information gathered during quarterly monitoring events, ground water depth at the site ranges from 9 feet to 12 feet below surface grade (bsg), and flows toward the southeast, but this may be modified by changing recharge and discharge patterns (Lines of Equal Depth to Groundwater Spring 1996, San Joaquin County Flood Control District and Water Conservation District [FCD&WCD]) UNDERGROUND STORAGE TANK REMOVAL A gasoline underground storage tank (UST) reportedly operated on the site for approximately 30 years, from 1940 until 1970 The UST system is assumed to have been removed after 1970, however, no records of the UST removal are available with the Tracy Fire Department, Tracy Building Department, or the San Joaquin County Environmental Health Department (EHD) Advanced CcoEnv►ronmental, Inc