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4.0 SUMMARY AND CQNCLUSIONS <br /> ' a March 16, 1998 groundwater elevation data indicates the groundwater flow direction <br /> beneath the site is toward the east-southeast with a hydraulic gradient of 0 0018 <br /> ' meter per meter (0 0018 ft/ft ) <br /> Q Groundwater elevations have risen approximately 1 04 meters (3 42 feet) from the <br />' previous average elevations measured for the Fourth Quarter 1997 monitoring event <br /> 0 TPH-D concentrations were detected in 11 of the 14 groundwater samples, while <br />' TPH-G was detected in 8 of the monitoring wells Both chemical compounds were <br /> detected at concentrations similar to previous sampling events <br /> o BTEX concentrations were detected in 11 of the 14 groundwater monitoring wells The <br /> concentrations are relatively unchanged since the previous quarter sampling event <br /> (Figures 3 and 4) <br />' o MTBE was detected in well MW-6 (5 8 ugh) The concentration is below the California <br /> Action level of 35 ug/i <br />' o Eight 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 samples from eight monitoring wells were above PDWS in <br /> � <br />' this quarterly sampling event, PSI recommends that quarterly sampling continue at the <br /> site <br /> 1 <br /> 1 <br /> 1 <br /> 1 i <br /> i <br /> 1 4 <br /> I <br /> F TranateAProlectlCalty09MG013%STOCKTO"m 19aFIN <br /> I <br />