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a BTEX concentrations were detected in eight of the fourteen groundwater monitoring <br /> wells (MW-12 through MW-14, MW-19, VW-1, MW-26, VM-1, and VM-2) Detectable <br /> concentrations of benzene ranged from 3 0 to 11,000 pg/I The concentrations have <br /> ' generally decreased since the previous quarter sampling event <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> o March 16, 1998 groundwater elevation data indicates the groundwater flow direction <br /> ' beneath the site is towards the southeast, with an average hydraulic gradient of 0 0034 <br /> meter per meter(0 0034 foot per foot) <br /> ' o Groundwater elevations have risen an average of 0 97 meters (3 2 feet) from the <br /> previous average elevations measured for the Fourth Quarter 1997 monitoring event <br /> ' o MTBE was not detected in any of the monitoring wells with the exception of the sample <br /> from well VM-1 (25pgA), TPH-G was detected in seven of the monitoring wells <br /> ' o BTEX concentrations were detected in eight of the fourteen groundwater monitoring <br /> wells The concentrations have generally decreased since the previous quarterly <br /> sampling event (Figures 3 and 4) <br /> o <br /> Six monitoringwells at the site have benzene concentrations above the State of <br /> California Pnmary Drinking Water Standards (PDWS) for benzene <br /> 5.0 RECOMMENDATIONS <br /> As benzene concentrations in six monitoring wells were above PDWS in this quarters <br /> ' sampling event, PSI recommends that quarterty sampling continue at the site <br /> 1 <br /> a <br /> F Ts eponCALTRANS%Ca&yO9717t017`on19aFIN <br />