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1.0 INTRODUCTION <br /> • The project site is located at 3931 Newton Road, in an industrial area on the northeast outskirts of <br /> Stockton near U S Highway 99 The location of the site is shown in Figure 1, and the site facilities <br /> are shown in Figure 2 Originally agricultural property, the site was developed as a commercial <br /> truck terminal 2n 1973 The property occupies an area of about 3 5 acres <br /> Topography in the area is generally flat, although the project site is elevated a few feet above the <br /> adjacent parcels There is a maintenance building and office fronting Newton Road, with a large, <br /> unpaved storage yard/parking lot to the rear A diesel and gasoline fueling facility, consisting of two <br /> underground storage tanks (UST's), was formerly present on the south side of the storage yard <br /> (Figure 2) This facility was removed in 1989 and replaced with an aboveground fueling facility, <br /> which is located to the west of the abandoned facility <br /> 2.0 PROCEDURES <br /> Groundwater monitoring took place on June 5 Monitoring was witnessed by Mr Nuel Henderson <br /> of EHD <br /> The wells were opened and allowed to equalize with atmospheric pressure before water depths were <br /> measured The depth to groundwater was measured with a water level meter and the measurements <br /> were recorded on the Well Monitor Report(Appendix A) <br /> • The wells were purged of 9 to 12 gallons of water <br /> rior to sampling, and conductive and <br /> p P H� conductivity, <br /> temperature were measured during purging The data were recorded on the Well Monitor Report <br /> Samples were collected in disposable plastic bailers and transferred to 1-liter amber bottles A <br /> sample was also collected at the tap on the domestic well (G-1) The samples were labeled and <br /> placed into a cooled ice chest, and then shipped to McCampbell Analytical for analysis All samples <br /> were analyzed for TPH-diesel The laboratory report is contained in Appendix B <br /> 3.0 RESULTS <br /> 3.1 Depth to Groundwater <br /> Table l provides all depth-to-groundwater measurements and calculated groundwater elevations <br /> The depth ranged from 59 24 to 6100 feet, which places the static water level within the silt and <br /> clay beds of the lower Modesto Formation The water level fell approximately 1 foot in all wells <br /> since they were monitored in March <br /> 3.2 Hydraulic Gradient and Groundwater Flow Direction <br /> The calculated water table elevations were used to construct the groundwater elevation map in <br /> Figure 3 Elevation contours form an arc that is centered on GT-1, where the static water level is at <br /> an elevation of 33 99 feet below sea level The water level is higher to the east, north, and west of <br /> 2 <br />