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4 0 SUMMARY AND CONCLUSIONS <br /> o August 24, 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 (0 003 foot per foot) <br /> 1 o Groundwater elevations have declined an average of three 0 18 meters (0 68 feet) <br /> from the previous average elevations measured for the Second Quarter 1998 <br /> monitoring event <br /> o MTBE w o etected in any of the monitoring wells with the exception of the sample <br /> from We VW-1 TPH-G was detected in four of the monitoring wells <br /> o BTEX concentrations were detected in seven of the fourteen groundwater monitoring <br /> wells The concentrations have generally increased since the previous quarterly <br /> sampling event (Figures 3 and 4) <br /> o The oxygenates TBA, DIPS, ETRE, and TAME were not detected 1n any groundwater <br /> samples this quarter <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 /> 5 0 RECOMMENDATIONS <br /> As benzene concentrations in six monitoring wells were above PDWS in this quarter's <br /> sampling event, PSI recommends that quarterly sampling continue at the site <br /> 4 <br /> F TransieAReporKCALTRANSSCaltyO9717t0175gm398fin <br />