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tank to the northeast corner of the U-Haul rental office (Figure 2). The dispenser, product piping, and miscellaneous concrete debris were transported to the local landfill for disposal. 3.3 SOIL SAMPLING On December 19, 1997, a representative of Blaes Environmental collected soil samples from beneath the underground storage tanks,the product dispensers,and soil stockpile in compliance with San Joaquin County Public Health Services-Environmental Health Division requirements. Soil samples were not collected from beneath the product piping due to the close proximity of the dispenser island to the tank excavation or beneath the vent lines since the vent lines were being abandoned in place. A total of twelve soil samples were collected at the site;two samples below the former 6,000-gallon gasoline tank, two below the former 6,000-gallon diesel fuel tank,one sample below each former product dispenser, and six samples(that were composited into three samples)from the excavation soil stockpile. A summary of the soil sampling program is presented in the following sections. 3.3.1 Former Underground Tanks Two soil samples (Tl-1 and TI-2)were collected below the former underground diesel fuel tank. Two soil samples (T2-1 and T2-2) were collected below the former underground gasoline tank. The soil samples • were collected in native soil at depths of approximately 15 feet below the ground surface (approximately three feet below the bottom of the former tanks). The location of each sample is shown in Figure 2. The soil samples were collected using the backhoe bucket. Each soil sample was collected near the teeth of the backhoe bucket by driving a six-inch brass sample ring into native soil within the bucket. Soil samples were properly sealed,labeled, and immediately placed in an ice-chest containing ice for transport. The soil samples were delivered under proper chain-of-custody to a certified independent analytical laboratory. During the underground storage tank closure soil sampling program, Blaes Environmental noted that the native soil in the excavation was silty clay from the ground surface to a depth of approximately three feet below the ground surface and silt from approximately three feet to 15 feet below the ground surface. Groundwater was not encountered in the excavations at the time of the tank closure program. 3.3.2 Product Dispensers Two soil samples (D-1@3' and D-2@5')were collected below the former product dispenser island. Both • soil samples were collected in native soil at depths of approximately three and five feet below the ground 5