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®►�,�►©�jj NG • contained 2,600 mg/kg of TPH which increased to 7,100 mg/kg in sample B1-30. TPH from sample B1-40 was found to be BRL. Each of the three soil samples from borehole BH1 , including sample B1-40, were found to contain low levels of BTEX. Figures 4-2 and 4-3 show the horizontal and vertical extent of the diesel fuel contamination. 5.0 CONCLUSIONS AND RECOMMENDATIONS 5.1 Conclusions The laboratory analytical results of soil samples from boreholes BH1, BH3, BH4, and BH5 indicate significant diesel contamination is present in the soil . The diesel fuel contamination does not extend to the ground water. A low level of BTEX is also present in soil at the site; however, the contamination is present at the low level of fib mg/kg when quantified to gasoline. The highest level of soil contamination is present in borehole BH1, which is located in the former location of the UST. In borehole BH1 , TPH concentrations detected were 2,600 ppm at 20 feet and 7, 100 ppm at 30 feet; and, the sample from 40 feet below the surface was reported to be BRL. It should be noted that the sample from 40 feet below the surface was found to contain low levels of BTEX. The TPH concentrations 1 reported in samples from boreholes BH4 and BH5 were significantly lower at 110 ppm and 150 ppm respectively, while the sample from borehole BH3 was BRL. BTEX contaminants were found in very low concentrations in all samples except the sample from borehole BH5. The BTEX contamination appears to be present across the UST area at very low levels. The underground diesel fuel storage tank was installed in 1964 when the site was developed. The tank has reportedly stored diesel fuel during its entire operational history. The source of the low level BTEX contamination is unknown. Data obtained from the boreholes and the laboratory analytical results indicate that a vertical plume of diesel fuel contamination is 11