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� • i <br /> 4aR/ERS ..E$✓.ERSGOR5I. NJrS <br /> BTEX compounds were detected in the 50 ft. soil sample from SB-2 at concentrations ranging <br /> from 0 0024 mg/kg for benzene to 0 0098 mg/kg for xylene The results for the 20 ft soil <br /> sample indicate the presence of toluene at 0 088 mg/kg, and xylene at 8 5 mg/kg (see Table 1) <br /> TPH--G and BTEX were not detected in either of the groundwater samples collected from soil <br /> borings SB-3 or SB-4 <br /> 3.4 RESULTS SUMMARY <br /> Soil and groundwater samples have been collected from this site since August 1986 in support <br /> of UST removals, quarterly sampling events, and a soil and groundwater investigation The <br /> available analytical data from previous investigations can be summarized as follows. <br /> 1 Petroleum hydrocarbons and BTEX compounds were not detected in any of the 10 <br /> groundwater samples collected from four on-site monitor wells and two Hydropunch <br /> groundwater samples. <br /> 2 All petroleum hydrocarbon impacted soil beneath the Weed Oil and Formulated Oil tanks <br /> 1 • was removed during the tank removal process <br /> 3 Petroleum hydrocarbons and BTEX compounds appear to be present in a limited extent <br /> beneath the former gasoline storage tank at 20 ft and at depths greater than 31 ft bgs. <br /> Although petroleum concentrations were found to be elevated at the 31 ft depth directly <br /> below the former gasoline tank, subsequent soil data indicates the concentrations <br /> decreased to 0.014 mg/kg for TPH as gasoline and 0 0182 mg/kg for BTEX compounds <br /> at 50 ft bgs in adjacent bonngs SB-1 and SB-2, respectively <br /> In conclusion, analytical data indicates that the groundwater beneath this site has not been <br /> impacted by petroleum products released from the USTs. Soil contamination appears to be <br /> limited to a small area beneath the former gasoline UST. <br /> 4.0 CORRECTIVE ACTION OPTIONS <br /> There are two options considered for the remediation of petroleum impacted soil at the site. One <br /> p <br /> option is to excavate the impacted soil from beneath the site and transport it for disposal or <br /> conduct on-site remediation The second option is to conduct an in-situ remediation method of <br /> the soil One method of in-situ remediation is soil vapor extraction (SVE). <br /> LIPROJECfS%SAKJOQVIAIN ACr 8 15 May 1996 <br />