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a - <br /> SITE CONTAMINATION WORK PLAN <br /> TERESI TRUCKING <br /> 900 1/2 East Victor Road <br /> Lodi, California <br /> 1.0 BACKGROUND <br /> The Teresi Trucking yard is located east of U. S. highway 99 in Lodi, California (Figure 1). On <br /> December 1, 1995, two underground storage tanks were removed by Jim Thorpe Oil from the <br /> rear portion of the facility(Figure 2). The tanks stored diesel and unleaded gasoline and had been <br /> used to fuel company trucks. In accordance with regulatory guidelines, three soil samples were <br /> collected from beneath the 10,000-gallon tank and 2 samples were collected from beneath the <br /> 2,000-gallon tank. Samples were also collected from the dispenser island, piping trench, and soil <br /> stockpiles. GeoAnalytical Laboratories analyzed the samples for the presence of petroleum <br /> hydrocarbons in the diesel and gasoline ranges, for volatile aromatic hydrocarbons, and for total <br /> lead. Contamination, primarily in the diesel range, was detected in several samples, and Thorpe <br /> performed additional excavation on December 6 in order to remove the remaining contaminated <br /> soil from the excavation. When the excavation reached a depth of 25 feet, a representative of FGL <br /> Environmental collected two additional samples from the floor of the excavation. Diesel was <br /> detected at concentrations of 3,000 and 6,000 mg/kg and gasoline was detected at concentrations <br /> of 60 and 800 mg/kg. Before performing any additional excavation, Teresi Trucking elected to <br /> examine other options for assessing the site, including the installation of soil borings and <br /> monitoring wells. The stockpile of excavated soil was covered with plastic sheeting and the <br /> excavation was allowed to remain open. <br /> After discussing the situation with several consulting companies, Teresi retained Upgradinet <br /> Environmental Consultants to prepare a work plan for the installation of one soil boring in the <br /> most contaminated portion of the excavation. The purpose of the boring is to assess the maximum <br /> depth of contamination and determine whether it can be removed by further excavation. <br /> 2.0 PROPOSED ASSESSMENT <br /> Teresi proposes to drill a soil boring in the western part of the tank excavation and collect soil <br /> samples at 5-foot intervals until either no further contamination is evident or groundwater is <br /> reached, whichever is shallower. At the present time, groundwater is estimated to be at a depth of <br /> 75 feet, according to representatives of the Environmental Health Division. If field screening using <br /> a portable photo-ionization detector indicates that contamination extends to groundwater, a <br /> hydropunch-type sampling device will be used to collect a groundwater sample. The samples will <br /> be submitted to a state-certified environmental laboratory for the following analyses: <br /> EPA method 3550/8015 (TPH-diesel) <br /> EPA method 5530/8015,(TPH-gasoline) <br /> EPA method 8020 (BTEX) <br /> �� wt <br />