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' Q BTEX concentrations were detected in six of the thirteen groundwater monitoring wells <br /> (MW-12, MW-13, MW-14, VW-1, MW-24, and VM-2) Detectable concentrations of <br /> benzene ranged from 0 3 to 26,000 micrograms per liter (Ng/1) The concentrations <br />' have generally decreased since the previous quarters sampling event <br /> MTBE concentrations were detected in two of the fourteen monitoring wells sampled <br /> (VW-1 and VM-2) Detectable concentrations ranged from 7 6 to 51 micrograms per <br /> liter (pg/1) <br /> 4 0 SUMMARY R AND CONCLUSIONS <br />' 0 September 25, 1997 groundwater elevation data indicates the groundwater flow <br /> direction beneath the site is towards the east, with a hydraulic gradient of 0 003 meter <br />' per meter (0 003 foot per foot) <br /> Groundwater elevations have risen an average of 1 5 meters (5 feet) from the <br />' previous average elevations measured for the fourth quarter 1996 monitoring event <br /> TPH-D was not detected in all of the monitoring wells, while TPH-G was detected in <br /> three of the monitoring wells <br /> o BTEX concentrations were detected in six of the thirteen groundwater monitoring <br />' wells The concentrations have generally decreased since the previous quarters <br /> sampling event <br />' a Four monitoring wells at the site have benzene concentrations above the State of <br /> California Primary Drinking Water Standards (PDWS) for benzene <br /> 5.0 RECOMMENDATIONS <br />' As benzene concentrations in five 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 TransferlReport%CALTRAN51Ca11yO971710171gm297!in <br />