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4 0 SUMMARY AND CONCLUSIONS <br /> June 15, 1998 groundwater elevation data indicates the groundwater flow direction <br /> beneath the site is towards the east, with an average hydraulic gradient of 0 002 meter <br /> per meter (0 002 foot per foot) <br /> a Groundwater elevations have risen an average of 1 10 meters (3 6 feet) from the <br /> previous average elevations measured for the Fourth Quarter 1997 monitoring event <br /> 0 MTBE was not detected in any of the monitoring wells, TPH-G was detected in four of <br /> the monitoring wells <br /> a BTEX concentrations were detected in five of the fourteen groundwater monitoring <br /> wells The concentrations have generally decreased since the previous quarterly <br /> sampling event (Figures 3 and 4) <br /> The oxygenates TBA, DIPE, ETBE, and TAME were not detected in any groundwater <br /> samples this quarter <br /> Three 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 three monitoring wells were above PDWS in this quarters <br /> sampling event, PSI recommends that quarterly sampling continue at the site <br /> 4 <br /> F Transfe6ReppmCALTRANS1CaltyO971710171gm198FIN <br />