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BTEX concentrations were detected in seven of the fourteen groundwater monitoring <br />' wells (MW-12, MW-13, MW-14, VW-1, VM-1, VM-2, and MW-26) Detectable <br /> concentrations of benzene ranged from 0 4 to 28,000 micrograms per liter (ug/1) The <br /> concentrations have generally decreased since the previous quarters sampling event <br /> MTBE concentrations were detected in two of the fourteen monitoring wells sampled <br /> (MW-13 and MW-14) Detectable concentrations ranged from 2 3 to 2 4 micrograms <br /> per liter (ug/1) MTBE concentrations have declined since the previous sampling <br /> event <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> 0 May 22, 1997 groundwater elevation data indicates the groundwater flow direction <br /> beneath the site is towards the east, with a hydraulic gradient of 0 003 meter per <br />' meter (0 003 foot per foot) <br /> 0 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 /> 0 TPH-D was not detected in all of the monitoring wells, while TPH-G was detected in <br /> five of the monitoring wells with concentrations generally decreasing from the previous <br /> sampling event <br />' a BTEX concentrations were detected in seven of the fourteen groundwater monitoring <br /> wells The concentrations have generally decreased since the previous quarters <br />' sampling event <br /> o Five 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 /> 4 <br /> F Transfer%RepprtlCALTRANMa"7p 7101 Nm297 fin <br />