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10 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 (Upgradient) assumed the responsibility for assessment and monitoring of groundwater contamination at the facility in September, 1994 2.0 PROCEDURES Groundwater monitoring took place on April 4 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 Solnnst water level meter and the measurements were recorded on the Well Monitor Report (Appendix A) The truck parking area has been resurfaced with gravel since the site was monitored in December, and well GT-2 could not be located under the gravel It was also not possible to monitor GT-9, because the neighboring property owner was not present After the water depth was measured, a Grundfos Readi-flo 2 groundwater pump was used to purge 12 gallons from GT-1, GT-6, and GT-10 The other wells were not purged Conductivity, pH, and temperature were measured during purging at 3-gallon intervals, and the readings were recorded on the Well Monitor Report The water was stored in 55-gallon drums near GT-5 Prior to sampling, the domestic well (G-1)was allowed to flow for approximately 30 minutes After purging, water samples were collected in disposable plastic bailers and placed 1-liter amber bottles The samples were placed in a plastic cooler, iced, and slapped to McCampbell Analytical in Pacheco, Calnforiva for analysis All samples were analyzed for TPH-diesel, and the sample from GT-10 was also analyzed for TPH-gasoline and BTEX 3.0 RESULTS 3.1 Groundwater Gradient and Flow Direction Depth-to-groundwater measurements and calculated groundwater elevations are presented in Table 0 1 Results from previous monitoring events are included for comparison 2