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Mr. Charles Leubner <br /> 25 March 1991 <br /> Page 4 <br /> Petroleum hydrocarbons in the diesel fuel range were detected in one of the five samples <br /> collected from the 10,000-gallon diesel tank excavation (Table 1). This sample (No. 039) <br /> r was collected from the southeast corner of the tank. This portion of the tank is where the <br /> remote fill line connected to the tank. Because no holes in the tank were evident at the <br /> time the tanks was removed, it is likely that the leakage occurred in the piping or tank <br /> connection rather than the tank itself. <br /> Petroleum hydrocarbons in the diesel fuel range were also detected at three locations <br /> ;. along the length of the remote fill line at remote fill sample locations Nos. 5, 6 and 9 <br /> (Table 1). 'The highest concentration (5,000 mg/Kg) was detected in the sample from <br /> location No. 5. Concentrations of 3.0 and 1.6 mg/Kg were also detected at location Nos. <br /> ;. 6 and 9, respectively. Benzene and toluene were not detected in samples from the tank or <br /> from the remote fill line; however, ethylbenzene and xylenes were detected in the sample <br /> from location No. 5 along the length of the remote fill line at concentrations of 950 and <br /> 11400 ug/Kg, respectively. <br /> Petroleum hydrocarbons in the gasoline range, ethylene dibromide, benzene, toluene, <br /> 'r ethylbenzene and xylenes were all detected in the samples collected beneath the 500-gallon <br /> gasoline tank (Table 1). Holes were not evident in this tank at the time of removal and the <br /> leakage is suspected as having occurred in the piping. <br /> EVALUATION OF SOIL SAMPLING RESULTS <br /> A leaching potential analysis was performed for the 10,000-gallon diesel tank and remote <br /> fill piping using the method outlined in the October 1989 version of the Leaking <br /> a. <br /> Underground Fuel Tank (LUFT) Field Manual. Based on the assumptions shown in Table 2, <br /> the site scored 38 points and according to the table, the maximum allowable TPH <br /> concentrations are 10 mg/Kg for gasoline and 100 mg/Kg for diesel. Thee values were <br /> �. exceeded for the 10,000-gallon diesel fuel tank and tank's remote fill line at location No. <br /> 5, and the 500-gallon gasoline tank. <br /> It is our recommendation that the School District consult with the County Health Division <br /> to determine if, on the basis of these results, further investigations of both tank <br /> excavations and location No. 5 along the diesel tank's remote fill line are warranted. <br /> V <br /> 1.r <br /> it <br /> it <br />