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HfIKlEX�IfRmfA <br /> _ f Mr. Charles Leubner <br /> `f 26 March 1991 <br /> -� Page 4 <br /> 1,000-Gallon Waste Oil Tank <br /> No petroleum hydrocarbons or aromatic hydrocarbons (benzene, toluene, ethylbenzene, and <br /> xylenes) were detected in the samples collected from the 1,000-gallon waste-oil tank (Tank <br /> ! ..I No. 8) excavation. Only nickel and zinc were detected in the WET extract, but they were <br /> below the criteria established for hazardous waste. <br /> =i <br /> Remote Fill Line for 10,000-Gallon Diesel Tank <br /> Total petroleum hydrocarbons as diesel were detected in the samples collected from <br /> beneath the remote fill lines for the 10,000-gallon diesel tanks. Where present, <br /> concentrations of total petroleum hydrocarbons as diesel ranged from 17 mg/Kg to 5,200 <br /> 1 mg/Kg. Toluene, ethylbenzene, and xylenes were also detected in one of these samples <br /> (No. 066) at concentrations of 70, 760, and 2700 ug/Kg, respectively (see Table 1). <br /> EVALUATION OF SOIL SAMPLING RESULTS <br /> ; > A leaching potential analysis was performed for the site using the method outlined in the <br /> October 1989 version of the Leaking Underground Fuel Tank (LUFT) Field Manual. Based <br /> - -� on the assumptions shown in Table 2, the site scored 33 points. Using these evaluations it <br /> ;- appears that the 53 mg/Kg of total petroleum hydrocarbons as diesel reported in the sample <br /> from beneath the piping of Tank Nos. 4 and 5 is below the maximum allowable total <br /> .._ petroleum hydrocarbons as diesel that may be left in the soil. Based on this evaluation, no <br /> further investigations or excavations are warranted at the 500-gallon diesel tank (Tank No. <br /> 4), the 500-gallon solvent tank (Tank No. 5), and the 1,000-gallon waste oil tank (Tank No. <br /> 8) locations. <br /> Two samples collected from the remote fill lines location on the site (see Figure 3 and <br /> Table 1), exceeded the 100 ppm level of total petroleum hydrocarbons as diesel allowable <br /> „i by the teaching potential. It is our recommendation that the School District consult with <br /> the County Health Division to determine if, on the basis of these results, further <br /> investigation of the excavation that formerly contained the 10,000-gallon diesel tanks' <br /> remote fill lines is warranted. <br /> E! <br /> E <br /> — E <br /> s <br /> 1 <br />