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KLEINFELDER <br /> 6 CONCLUSTIONS AND RECOMMENDATIONS <br /> 61 CONCLUSIONS <br /> ' Groundwater elevations ranged from a maximum of 2 65 feet above mean sea level (msl) at <br /> MW-4 to 134 feet above msl at MW-2 Depth to water at the four wells was measured within the <br /> range of 38 34 to 37 45 feet bgs Groundwater flow direction was calculated towards the <br /> ' southwest with an approximate gradient of 0 004 ft/ft <br /> No product or sheen was observed from groundwater monitoring wells MW-2, MW-3, and MW- <br /> ' 4 Approximately four inches of floating product and a strong petroleum-like odor was noted in <br /> the groundwater from monitoring well MW-1 <br /> ' TPH-D, TPH-G, ethylbenzene, and total xylenes were detected in groundwater samples collected <br /> from MW-1, Iocated approximately 10 feet down-gradient of the UST area TPH-D was detected <br /> at concentrations of 350 mg/l and TPH-G at 6 4 mg/l Ethylbenzene was detected from <br />' groundwater samples collected from MW-1 at concentrations of 2 1 µg/l, while total xylenes <br /> were reported at concentrations of 1 5 ug/1 None of the requested analytes were detected in the <br /> groundwater collected from the down-gradient monitoring wells, MW-2 and MW-3, nor from the <br /> upgradient well MW-4 - <br /> The concentration of ethylbenzene found in MW-1 (2 1 µg/l) was found to be well below the <br /> State and Federal Primary Maximum Contaminant Levels (MCLs) for ethylbenzene which is 700 <br /> µg/1 The concentration of total xylenes (1 5 ug/1) was also below the State Primary MCL of <br />' 1750 ug/l <br /> Based on the information obtained, it is Kleinfelder's opinion that the groundwater contaminant <br /> plume is located the vicinity of MW-1 and the existing UST It appears the contamination plume <br /> is mostly contained within p erimeter m onitonng w ells M W-2, M W-3 a nd M W-4 D uring t he <br /> third quarter 2002 sampling event, TPH-D was not detected in the groundwater samples from the <br />' down-gradient well MW-2, supporting the idea that the trace concentration reported in the <br /> previous quarter was due to error or is an anomaly Additional sampling events should be <br /> conducted to assess the potential of contaminants by MW-2 <br />' 18748 T02/ST02R795 <br /> Page 9 of 11 <br />' 0 2011 Klemfelder, Inc December 3,2002 <br />