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f' KLEfNFELDER <br /> on the current - been <br /> • groundwater monitoring data, the MCL for 1,2 DCA has be <br /> ' exceeded in wells MW-5,f Y, MW-7, MW-8, MW-10, MW-12, and SP-5 <br /> • The contaminant mass estimation in groundwater indicated that a total mass for <br /> ' benzene was 1 8 Kg and the total mass for TPH-G was 70 7 Kg In comparison <br /> to the previous estimation, it appears that the contaminant mass has decreased <br />' significantly <br /> • The groundwater fate and transport model for benzene Indicated that the <br /> tassociated C, concentrations decrease rapidly at a conservative distance of 30 <br /> feet from the source to be within the associated MCL The model for TPH-G <br /> ' indicated that the concentrations decrease rapidly at a conservative distance of <br /> 24 feet from the source to be within the goal of 50 mg/L - <br /> Based on the results of the October 2004 sampling event, it appears that further <br /> groundwater remediation is warranted at the facility PSC recommends that the current <br /> quarterly groundwater monitoring plan continue as is However, PSC requests that with <br /> the exception of DIPE, the remaining oxygenates be removed from the analytical <br /> reporting list, since the remaining oxygenates have been consistently undetected In <br /> addition, PSC recommends the re-installation of the remediation system utilizing the <br /> existing remediation wells, but with increased air-sparging capacity in the suspected <br /> source area Re-installation of the system may require modifications to the existing air <br />' permit, modifications to existing equipment, and three sparge wells will need to be <br /> developed to remove Infiltrated sediment from the wells <br /> C23-484517-BOOISAC5R540 Page 13 of 14 August 11, 2005 <br /> Copyright 2005 Klemfelder, Inc <br />