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o BTEX concentrations were detected in ten of the fourteen groundwater monitoring <br /> wells (MW-1, MW-2, MW-3, MW-6, MW-7, MW-8, VW-1, VW-2, MW-11, and MW-12) <br /> Detectable concentrations of benzene ranged from 0 4 to 2,300 micrograms per liter <br /> (ug/1) The concentrations have typically decreased since the previous quarters <br />' sampling event <br /> 0 MTBE concentrations were detected in five of the fourteen monitoring wells sampled <br /> (MW-1, MW-3, MW-6, VW-1 , VW-2) Detectable concentrations ranged from 2 0 to 29 <br /> micrograms per liter (ug/1) MTBE concentrations have declined since the previous <br />' sampling event <br />' 4.0 SUMMARY AND CONCLUSIONS <br /> 0 May 27, 1997 groundwater elevation data indicates the groundwater flow direction <br /> beneath the site is towards the east, with a hydraulic gradient of 0 001 meter per <br /> meter (0 001 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 at concentrations similar to previous sampling events <br />' 0 BTEX concentrations were detected in ten of the fourteen groundwater monitoring <br /> wells <br />' O MTBE was detected in five of the fourteen groundwater monitoring wells <br /> 0 Nine monitoring wells at the site have benzene concentrations above the State of <br /> California Primary Drinking Water Standards (PDWS) for benzene <br /> 4.0 RECOMMENDATIONS <br /> 1 As benzene concentrations in nine monitoring wells were above PDWS in this quarters <br /> sampling event, PSI recommends that quarterly sampling continue at the site <br /> 4 <br /> F TransferlRepoR1CALTRANS%Calty0971710171gm297 fin <br />