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' o BTEX concentrations were detected in nine of the fourteen groundwater monitoring <br /> wells (MW-11, MW-12, MW-13, MW-14, MW-19 VW-1, MW-26, VM-1, and VM-2) <br /> Detectable concentrations of benzene ranged from 1 1 to 12,000 pg/1 The <br /> ' concentrations have generally increased since the previous quarter sampling event <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> December 29, 1997 groundwater elevation data indicates the groundwater flow <br /> ' direction beneath the site is towards the east, with an average hydraulic gradient of <br /> 0 0018 meter per meter(0 0018 foot per foot) <br /> ' 0 Groundwater elevations have risen an average of 21 meters (0 69 feet) from the <br /> previous average elevations measured for the third quarter 1997 monitoring event <br />' o TPH-D and MTBE was not detected in any of the monitoring wells, TPH-G was <br /> detected in five of the monitoring wells <br /> o BTEX concentrations were detected in nine of the fourteen groundwater monitoring <br /> wells The concentrations have generally increased since the previous quarters <br /> sampling event (Figures 3 and 4) <br /> o Six monitoring wells at the site have benzene concentrations above the State of <br /> California Primary Drinking Water Standards (PDWS) for benzene <br /> i <br /> 5 0 RECOMMENDATIONS <br /> As benzene concentrations <br /> in six monitoring wells were above PDWS in this quarters <br /> sampling event, PSI recommends that quarterly sampling continue at the site <br /> 1 � <br /> 4 <br />' F Transfer%ReportlCALTRANS%Calty0971710174gm497FIN <br />