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Site Background Information Former TRACY DINER 95 West 11'h Street, Tracy, California The site is located in a business/agricultural area of central Tracy, California. It is situated at the intersection of West 11 m Street and Adams Street;as depicted on the Tracy Quadrangle(7.5-Minute USGS Topographic Series, 1968,photo revised 1976), it is in an area of low topographic relief, at an elevation of approximately 18 feet above mean sea level(see Figure 1). The prominent features on the subject property are depicted in Figure 2. REGIONAL GEOLOGIC&IYDROGEOLOGIC 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,which is a large, elongate,northwest-trending asymmetrical structural trough(basin). It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Siena 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 range in age with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments with sources being 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). The estimated depth to ground water at the property is approximately 10 feet below surface grade (bsg),based on the map titled Lines of Equal Depth to Groundwater Spring 1996 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD). Based upon a previous investigation performed by AGE,ground water depth at the site ranges between 10 and 12 feet bsg. It is inferred from the map titled Lines of Equal Elevation of Groundwater Spring 1996, also published by the FCD&WCD, that ground water flows toward the northwest in the general area of the site, but this may be modified by changing recharge and discharge patterns. Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes. UNDERGROUND STORAGE TANK REMOVAL A gasoline underground storage tank/s(UST)reportedly operated on the site for approximately thirty years,from 1940 until 1970.The UST system is assumed to have been removed after 1970;however, Advanced GcoEnvtmnmeaW,Inc.