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R&B Trucking Preliminary Site Assessment Page: 2 2.1 Project Setting The property is located on a level area on the north side of Tracy,near the western margin of the San Joaquin Valley(Figure 1). The San Joaquin Delta is located a few miles north of the site,down a gentle slope which comes off the alluvial fans on the east side of the Central Coast Range. 2.2 Site History The eastern part of the property is occupied by a house and an office building(Figure 2). Seven underground fuel tanks serving the R&B Trucking Company were removed from the western portion of this property. —' R&B Trucking has operated on this property for many years. Much of the property is undeveloped with large portions used for truck parking. Except for the office parking area,the ground is unpaved. A few buildings used for shops and storage sheds occur on the back portion of the land. Mr. Barenchi is in the process of selling his property to real estate developers. Included in this process was the removal of several underground storage tanks. On 17 March 1989, Mr. Barenchi hired a contractor to excavate these tanks. Jaime Favila of the San Joaquin Local Health District was on site to direct the tank removal and soil sampling activities. Precision Analytical Laboratories, Inc. collected and analyzed fourteen soil samples for total petroleum hydrocarbons as diesel. The analytical data showed two areas with only minor levels of contamination, and one area with fairly high levels. This data is shown in Table 1. Samples were collected at depths between 11 to 14 feet and 2 to 3 feet below the bottom of the tanks. On 16 May 1989,Ben Curran of Curran Real Estate and Insurance requested that this project be placed on the County's pilot program. On 20 June 1989,Jaime Favila wrote a short letter of response including a packet of information of applications for well permits and subsurface investigations. This information will be used by Geological Technics to prepare the preliminary site assessment work plan. Ground water is fairly shallow in Tracy,ranging from about 10 to 15 feet. Therefore, the soil samples collected during tank removal were collected only a few feet above the water table. The work plan described below is designed to accommodate this situation.