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. 1.0 INTRODUCTION This report presents the results of groundwater monitoring activities for the third calendar quarter of 1999 at 900 1/2 East Victor Road in Lodi, California The property is owned by Teresi Trucking Company The work was conducted in accordance with proposal #99017 and approved by the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), which is the lead agency responsible for regulatory oversight 2A BACKGROUND 2.1 Site Location and Description The Teresi 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 Eight soil samples were collected from beneath the tanks when . they were removed, and 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 to remove the remaining contaminated soil from the excavation 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 in two bottom samples, and PHS/EHD then instructed Teresi Trucking to submit a work plan for assessing the extent of this contamination In early 1996, five borings, including three monitor wells, were drilled and twenty-five soil samples and six water samples were collected for analysis Diesel was detected in one soil sample and two groundwater samples, and a program of groundwater monitoring was initiated The wells were sampled during the second,third, and fourth quarters of 1996, at which time little or no groundwater contamination was detected No fiirther work was required by San Joaquin County at that time, but the case was not closed and the wells were allowed to remain in place In April 1999, PHS/EHD requested two additional quarters of water sampling to determine the present status of the site PHS/EHD also requested that a well (potential receptor) survey be conducted, and after discussions with Upgradient Environmental it was decided to conduct such a survey if contamination was detected during either quarter Wells at the site were monitored in June 1999, and diesel-range hydrocarbons and benzene, toluene, MTBE, and TAME were • 1