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l <br />* 4.0 CONCLUSIONS <br /> Y:. <br /> i <br /> Concentrations of petroleum hydrocarbons decreased in source area wells MW-2 MW-2A. <br /> Benzene, toluene, ethylbenzene and total xylenes (BTEX) concentrations in MW-2 decreased. <br /> Toluene and total xylenes were detected in the duplicate sample collected from MW-2A, but were <br />_ not detected in the primary sample. No petroleum hydrocarbons were detected in upgradient well <br /> r MW-9; the detection of petroleum hydrocarbons last quarter appears to be a one-time event and <br /> may have occurred because of the flat groundwater gradient and the impact of purging the well, <br /> laboratory contamination or contamination from exhaust from passing vehicles. These results are <br /> consistent with the seasonal variations observed with an increase in the water table elevation over <br /> the past 2 years, except that the concentrations of total petroleum hydrocarbons as gasoline and <br /> BTEX have decreased significantly. Groundwater flows into a trough and then to the northeast <br /> with a horizontal gradient of 0.002 ft/ft. <br /> t <br /> I�Y <br /> F i <br /> BPR0lECTS\SANJ0Q5HSA11 Q01 RPT.WPD 6 <br /> � 1 <br />