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1.0 INTRODUCTION <br /> Upgradient Environmental Consultants (Upgradient) assumed the responsibility for assessment and <br /> monitoring of groundwater contamination at the Gillies Trucking facility in Stockton, California in <br /> September, 1994 Based on these investigations, Upgradient submitted a Problem Assessment <br /> Report in November 1996 that presents the status of the investigation through the third quarter of <br /> 1996 Since then, Upgradient has conducted groundwater monitoring activities for the fourth <br /> quarter of 1996, and the purpose of this report is to present those results <br /> 2.0 BACKGROUND INFORMATION <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 in 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 several 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 in the rear A diesel and gasoline fueling facility, consisting of two <br /> underground storage tanks (UST's), was formerly present on the east side of the storage yard <br /> (Figure 2) This facility was removed in 1989 and replaced with an above-ground fueling facility, <br /> which is located to the west of the abandoned facility <br /> 3.0 MONITORING PROCEDURES <br /> Groundwater monitoring took place on December 11, 1996 Upon arrival at the site, Upgradient <br /> personnel opened all six wells and allowed well pressures to equalize with atmospheric pressure <br /> before measuring water depths The depth to groundwater in each well was measured with a Solinst <br /> water level meter and the measurements were recorded on the Well Monitor Report (Appendix A) <br /> A Grundfos Readi-flo 2 groundwater pump was then used to purge 15 gallons (slightly more than <br /> three well volumes) from wells GT-9 and GT-6 Between 20 and 50 gallons were purged from GT- <br /> 1, GT-2, and GT-3 in order to draw the water level down to the level of the slotted casing so that <br /> water samples could be obtained The pump was decontaminated with TSP solution between wells <br /> Because of slow recharge and binding of the pump against the well casing, GT-5 was hand-bailed <br /> with a disposable bailer, and approximately 10 gallons were removed from that well The water was <br /> stored in 55-gallon drums on the south edge of the property Temperature and other parameters <br /> could not be measured during purging because of equipment failure <br /> Water samples were collected in disposable plastic bailers and placed in sterilized 40-m1 vials and <br /> 1-liter amber bottles The samples were placed in a plastic cooler, iced, and shipped to McCampbell <br /> Analytical in Pacheco, California for analysis The samples were analyzed for TPH-gasoline, TPH- <br /> diesel, and BTEX <br />