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� r SITE CONTAMINATION WORK PLAIT TERESI TRUCKING 900 1/2 East Victor Road Lodi, California 1.0 BACKGROUND The Teresi Trucking yard is located east of U. S. highway 99 in Lodi, California (Figure 1). 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, three soil samples were collected from beneath the 10,000-gallon and 12,000-gallon diesel tanks and 2 samples were collected from beneath the 2,000-gallon gasoline tank. 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, and Thorpe performed additional excavation on December 6 in order to remove the remaining contaminated soil from the excavation. When the excavation reached a depth of 25 feet, a representative of FGL Environmental collected two additional samples from the floor of 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. Before performing any additional excavation, Teresi Trucking elected to examine other options for assessing the site, including the installation of soil borings and monitoring wells. The stockpile of excavated soil was covered with plastic sheeting and the excavation was allowed to remain open. After discussing the situation with several consulting companies, Teresi retained Upgradient Environmental Consultants to determine whether the contamination could be removed by excavation. Upgradient prepared a work plan for the installation of one soil boring in the most contaminated portion of the excavation. The intent was to drill either to groundwater or to the lower limit of the contamination, whichever was shallower. At the request of the State Underground Tank Fund, that work plan has been revised to assess not only the vertical extent of contamination but also to provide data on the lateral extent of contamination. 2.0 PROPOSED ASSESSMENT Teresi proposes to drill a minimum of three soil borings in the vicinity of the tank and dispenser excavations and collect soil samples at 5-foot intervals until either no further contamination is evident or groundwater is reached, whichever is shallower. At the present time, groundwater is estimated to be at a depth of 75 feet, according to representatives of the Environmental Health Division. If field screening using a portable photo-ionization detector indicates that contamination extends to groundwater, a hydropunch-type sampling device will be used to collect a groundwater sample. The samples will be submitted to a state-certified environmental laboratory for the following analyses: