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were low (maximum of 3 8 mg/Kg total xylenes) Low levels of total lead (3.1 mg(Kg) were <br /> also detected in samples characterized for disposal purposes These concentrations are well <br /> below the total threshold hunt concentration (TTLQ of 1000 mg/Kg for lead and are most <br /> likely naturally occurring <br /> No detectable concentrations of TPH as gasoline or benzene were detected. This suggests <br /> that there is no gasoline-impacted soil in the vicinity of the tankpit excavation. <br /> A vapor observation point was installed at the base of the excavation to provide a means <br /> whereby vapors from the native formation may be monitored. <br /> The excavation was backfilled and compacted with clean fill matenal and paved at the <br /> surface. <br /> 4.1 Conclusions <br /> These activities have resulted in the removal of hydrocarbon-impacted soil from the <br /> immediate vicinity of the original tank pit. This action has reduced the potential for <br /> migration of the residual petroleum hydrocarbons in the soil to the underlying groundwater <br /> MZM&23/95NDBF/95-OW7 $ <br />