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1.0 INTRODUCTION 1.1 Background Information 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 truth 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 east 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 )-.I . V-d E Upgradient Environmental Consultants (Upgradient) assumed the responsibility for assessment and monitoring of groundwater contamination at the facility in September, 1994 In November 1996, Upgradient submitted a Problem Assessment Report, which was approved by San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) in January 1997 PHS/EHD recommended that a Corrective Action Plan be submitted outlining the assessment, presenting the results of a feasibility study of potential remediation methods, and discussing applicable cleanup �1 goals For various reasons, the project stalled at this point and no Corrective Action Plan was prepared Groundwater monitoring continued sporadically through early 1998, but due to high water levels in the monitor wells, no samples were collected between November 1997 and March 1999 Monitoring was renewed after a new well (GT-10)was installed in March 2.0 PROCEDURES Groundwater morutonng took place on December 22 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 Solmst water level meter and the measurements were recorded on the Well Monitor Report (Appendix A) A Grundfos Readi-flo 2 groundwater pump was then used to purge 20 gallons from GT-1, GT-2, GT-3, GT-5 and GT-6 Because GT-10 is shallower and contained only 7 feet (4 5 gallons) of water, only 3 gallons were purged from this well before it went dry Conductivity, pH, and temperature were measured dunng purging at 4-gallon intervals, and the readings were recorded on the Well Monitor Report The water was stored in 55-gallon drums near GT-3 and GT-6 Monitor well GT-9 was not purged After purging, water samples were collected in disposable plastic bailers and placed in sterilized 1- liter amber bottles and 40-m1 glass vials containing HCl as a preservative Sample G-1B was collected from the valve on the storage tank of the Gillies domestic well The samples were placed in a plastic cooler and shipped to McCampbell Analytical in Pacheco, California for analysis All 2