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' Di Salvo Trucking - O.E.B. over-mccavation June 21, 1994 Pages -3- ' 3.2 Soil Samples A total of 3 soil samples were collected from the over- excavated area. Two soil samples were collected from the east sidewall of the enlarged excavation at approximately 15 feet below ground surface. The samples were collected from the north ' and south ends of the east sidewall, respectively. One soil sample was collected from the floor of the enlarged excavation at a depth of approximately 15.5 feet below ground surface. The bottom soil sample was very moist. 1 The Spring, 1988, San Joaquin County Flood Control and Water Conservation District map shows groundwater at the site was ' between 10 and 20 feet below the ground surface. very moist soil encountered during the over-excavation and the Spring, 1988 flood control map indicate the current depth to groundwater may be expected from approximately 16 to 20 feet below the ground surface. The soil samples were collected with a remote sampling tool. A sampling spoon attached to the end of the tool was driven into freshly exposed soil. The sampling spoon was cleaned prior to collection of each sample. The cleaning procedures consisted of washing the sampling spoon in a solution of laboratory-grade, ' non-phosphate detergent and hydrocarbon-free water, and double- rinsing with hydrocarbon-free water. The soil samples were collected in clean brass tubes, sealed at each end with Teflon tape, capped, wrapped with duct tape, labeled, and placed in a cooler chilled with Blue Ice. The soil sample I.D numbers and sampling locations are shown in Figure 2, Appendix B. One stockpile sample was collected from Stockpile No. 3. The sample was collected from freshly exposed soil at a depth of approximately 12 inches below the surface of the stockpile using a clean brass tube. All soil samples were delivered under chain- ' ' CONDOR