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1.0 INTRODUCTION The project site is located at 3931 Newton Road, in an industrial area on the northeast outskirts of Stockton near U S Highway 99 The location of the site is shown in Figure 1, and the site facilities are shown in Figure 2 Originally agricultural property, the site was developed as a commercial truck terminal in 1973 The property occupies an area of about 3 5 acres Topography in the area is generally flat, although the project site is elevated several feet above the adjacent parcels There is a maintenance building and office fronting Newton Road, with a large, unpaved storage yard/parking lot in the rear A diesel and gasoline fueling facility, consisting of two underground storage tanks (UST's), was formerly present on the south side of the storage yard (Figure 2) This facility was removed in 1989 and replaced with an above-ground fueling facility, which is located to the west of the abandoned facility Upgradient Environmental Consultants assumed the responsibility for assessment and monitoring of groundwater contamination at the facility to September, 1994 2.0 PROCEDURES Groundwater monitoring took place on September 14 The wells were opened and allowed to equalize with atmospheric pressure before water depths were measured The depth to groundwater in each well was measured with a Solinst water level meter and the measurements were recorded on the Well Monitor Report (Appendix A) It was still not possible to locate well GT-2, which has been buried under road aggregate since December 1999 The depth to groundwater was not measured in GT-9 because the neighboring property owner was not present at the time Water samples were collected after the water depth was measured The wells were not purged prior to sampling The sample from domestic well G-1 was collected at the sample port that is located on the storage tank The samples were transferred from disposable plastic bailers to 1-liter amber bottles and 40-m1 vials and then shipped to McCampbell Analytical in a chilled ice chest The samples were analyzed for TPH-diesel, TPH-gasoline, and BTEX The samples from GT-I and GT-10 were also analyzed for gasoline oxygenates A thin sheen of hydrocarbons was evident in the bailer and sample bottle when GT-10 was sampled, and a very strong diesel odor was noted 3.0 RESULTS 3.1 Groundwater Gradient and Flow Direction Depth-to-groundwater measurements and calculated groundwater elevations are presented in Table 1 Results from previous monitoring events are included for comparison 2