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JUJ/1-K GUI-4 <br />' � R <br /> W��dward-Clyde Consultants <br /> the spill had been migrating downgradient to the southeast due to the soil <br /> contamination being greater in sample E-4 than from E-1 in the southeast <br /> corner. The local groundwater gradient was assumed to be the same as the <br /> gradient on the south side of the facility which was determined previously <br /> to be towards the southeast. <br /> In an effort to determine the downgradient extent of contamination, two <br /> borings were advanced to the southeast of the existing tank. Soil samples <br /> were taken continuously from 4 to 7.5 ft. All samples were examined for <br /> soil type and presence of hydrocarbons. One sample tube from each of two <br /> sample locations per boring was extruded in the field and a headspace <br /> analysis run using an hnu organic vapor meter. Based on the visual and <br /> odor observations and the headspace readings, the sample with the greatest <br /> apparent contamination was selected for laboratory analysis . Because no <br /> contamination was detected in any of the samples from boring 18, the sample <br /> nearest the water table was selected. The samples were sealed, kept cool <br /> and delivered to the laboratory. Both borings were completed as monitoring <br /> wells to a depth of approximately 19 ft. The wells were later developed by <br /> bailing and water samples taken immediately afterwards. The bailed water <br /> was placed in the tank used to hold the water pumped from the excavation as <br /> described above. The boring logs and well construction details are <br /> appended to this report. Locations of the wells are shown in Figure 1. <br /> The results of the soil and water sample analyses were similar for each <br /> boring/well . In MW-15, the TPH and benzene levels in the soil were 130 and <br /> 0.8 mg/kg, respectively with the levels in the water being 5.8 and <br /> 0.1 mg/L, respectively. The soil contamination in MW-18 was below the <br /> detection levels of 10 mg/kg for TPH and 0.5 mg/kg for BTX. Similarly, the <br /> water sample analyses found contaminates below the detection levels of <br /> 0.05 mg/L TPH and 0.525 ug/L BTX. A copy of the lab report is appended. <br />