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1 <br />' Site Background Information <br /> Former TRACY DINER <br />' 95 West 11'h Street, Tracy, California <br />' The former Tracy Diner, situated at the intersection of West 11 h Street and Adams Street, is located <br /> in a 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 as depicted on the <br />' Tracy Quadrangle(7 5-Minute USGS Topographic Series, 1968,photo revised 1976)(see Figure 1) <br /> The prominent features on the subject property are illustrated on Figure 2 <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 pnmanly deposited <br /> in lacustrme, fluvial, and alluvial environments from the mountain ranges surrounding the valley <br /> (Olmsted and Davis, 196 1) 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 />' According to a previous investigation performed by AGE, ground water depth at the site ranges <br /> between 10 and 12 feet below surface grade (bsg), and flows toward the northwest,but this may be <br /> modified by changing recharge and discharge patterns(Lines ofEqualDepth to Groundwater Spring <br /> 1996, San Joaquin County Flood Control District and Water Conservation Distract(FCD&WCD)) <br /> IUNDERGROUND STORAGE TANK REMOVAL <br /> A gasoline underground storage tank(UST)reportedly operated on the site for approximately thirty <br /> years,from 1940 until 1970 The UST system is assumed to have been removed after 1970,however, <br /> no records of the UST removal are available with the Tracy Fire Department, Tracy Building <br /> Department, or the San Joaquin County Environmental Health Department (EHD) <br /> IPREVIOUS SUBSURFACE INVESTIGATIONS <br /> On 04 May 2000,five soil probe borings were advanced at the site under the observation of an EHD <br /> IAdvanced GeoEnvironmental,Inc <br />