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Stockton Taxi Cab/Sunland Gasoline September 16, 2003 <br /> 2085 Fremont Street,Stockton, California Page 3 <br /> Report of Findings: Lateral and Vertical Extent <br /> of Soil and Groundwater Contamination Z% <br /> converted to monitoring wells. Figure 3 illustrates the placement of propo'se oil and <br /> groundwater monitoring wells. <br /> ■ Groundwater Monitoring Well Installation: Conversion of four (4) soil borings to <br /> monitoring wells. The groundwater table is approximately 58' below the surface. <br /> The placements of these wells are depicted in Figure 3. Soil samples from each <br /> boring were collected at 5' intervals. Each sample was screened with a PID for the <br /> presence of petroleum hydrocarbon contamination. <br /> 3.1 Drilling <br /> Permits were obtained, as necessary, for the borings before drilling begins. The <br /> borings for the monitoring wells and four (4) of the soil borings were <br /> accomplished using a mobile mounted drilling rig employing the use of a hollow <br /> stem flight auger no less than 3 114-inch i.d. and 8 7/8 o.d. <br /> All drilling equipment was thoroughly steam cleaned before drilling began, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> prevent cross contamination. <br /> I The borings were logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Appendix Q. The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent <br /> soil or bedrock characteristics, and any evidence of contamination were noted. <br /> All water-bearing zones and the depths at which they were encountered were <br /> noted on these logs (Appendix B). <br /> All borings were drilled in such a manner as to prevent cross contamination <br /> g <br /> between strata. The borings were then terminated with a cement and three percent <br /> ' (3%) Bentonite mixture. <br /> r3.2 Soil Sampling C a"^0Y <br /> All soil sampling equipment was thoroughlysteam clear before and between <br /> sampling to prevent cross contamination. Relatively-undisturbed soil samples <br /> were taken at intervals of not more than five feet (5') in order to evaluate the <br /> ' subsurface materials. <br /> The soil samples were taken using a California Modified Split Spoon sampler <br /> with brass liners. The sampler were driven continuously by a wire line hammer. <br /> 1 <br />