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. 1.0 INTRODUCTION This report presents the results of groundwater monitoring activities for the fourth calendar quarter of 1996 at 900 112 East Victor Road in Lodi, California The property is owned by Teresi Trucking Company The work was conducted in accordance with proposal #96021 and approved by the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), which is the lead agency responsible for regulatory oversight 2.0 BACKGROUND 2.1 Site Location and Description The Teresa Trucking yard is located east of U S highway 99 in Lodi, California (Figure 1) Most of the site is paved for truck parking Two large buildings for storage and truck maintenance are also present on the site Surrounding parcels are devoted to industrial and commercial uses 2.2 Previous Work On December 1, 1995, three underground storage tanks were removed by Jim Thorpe Oil from the rear portion of the facility (Figure 2) The tanks stored diesel and unleaded gasoline and had been used to fuel company trucks In accordance with regulatory guidelines, eight soil samples . were collected from beneath the tanks when they were removed Samples were also collected from the dispenser island, piping trench, and soil stockpiles GeoAnalytical Laboratories analyzed the samples for the presence of petroleum hydrocarbons in the diesel and gasoline ranges, for volatile aromatic hydrocarbons, and for total lead Contamination, primarily in the diesel range, was detected in several samples Thorpe performed additional excavation on December 6 in order to remove the remaining contaminated soil from the excavation PHS/EHD instructed Thorpe to cease excavating at a depth of 25 feet and collect two bottom samples Figure 2 shows the approximate locations of samples OE-1 and OE-2, in which diesel was detected at concentrations of 3,000 and 6,000 mg/kg and gasoline was detected at concentrations of 60 and 800 mg/kg PHS/EHD then instructed Teresa Trucking to submit a work plan for assessing the extent of this contamintion The stockpile of excavated soil was covered with plastic sheeting and the excavation was allowed to remain open On February 12, 1996, five borings were drilled by V & W Drilling of Rio Vista, California, under contract to Upgradient Three of the borings were converted to monitor wells Twenty-five soil samples, two hydropunch water samples, three water samples from the newly installed monitor wells, and one sample from the out-of-use domestic well were collected and sent to Excelchem Laboratory in Roseville Diesel was detected in one soil sample and two groundwater samples The monitor wells and domestic well were resampled on April 18 and August 8, and the f