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#� Kn KLEINFELDER - <br /> 6P <br /> , 3 BACKGROUND <br /> 3.1 HISTORY OF SITE <br /> A gas station was built on the site sometime around 1960. Product was removed from the <br /> tanks in 1980. Four underground storage tanks were used, two 1,000-gallon, one 6,000- <br /> gallon, and one 8,000-gallon. Product was pumped from all of these tanks in 1980 and all <br /> �. four tanks were removed in 1988. After the tanks were removed, the pits were partially <br /> backfilled with soil excavated from the tank area. <br /> 3.2 ANALYTICAL RESULTS <br /> During tank removal and under the direction SJLHD staff, soil and ground water samples <br /> r were taken from each excavation. Soil samples were collected at a depth of 15 feet from <br /> beneath the tanks, which were 7 feet below ground water. Water samples were taken from <br /> the uncleaned bucket of a backhoe used to excavate the pits. In both cases, the sampling <br /> technique was not based on accepted standards, and these results are of questionable value. <br /> The significant data from the analyses are summarized below: <br /> Parameter Small Pit Large Pit <br /> Soil Samples- <br /> Benzene ND ND <br /> Toluene ND ND <br /> Xylene ND 0.7 mg/kg <br /> Total Petroleum Hydrocarbons 18 mg/kg ND <br /> Water Samples- <br /> , Benzene 3.$ mg/1 0.06 mg/1 <br /> Toluene 7.2 mg/1 0.09 mg/1 <br /> Xylene 18.0 mg/1 1.2 mg/1 <br /> Total Petroleum Hydrocarbons 30.0 mg/1 5.0 mg/1 <br /> Some of the tanks had holes and one tank's seam ruptured during removal. This means <br /> that during removal there was a high probability that any product remaining in the tanks <br /> would leak out and fall to the bottom of the excavation. Since the water table is <br /> + approximately 6 feet below the ground surface, the soil samples collected at a depth of 15 <br /> 121-88-1108 4 <br />