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a <br /> MI+GE0.5 "f SYfklStA'a5uiA4i$ <br /> 4.0 CONCLUSIONS <br /> 1 <br /> Concentrations of petroleum hydrocarbons in source area wells MW-2 and MW-2A decreased <br />' Benzene and ethylbenzene concentrations in MW-2 were similar to those detected in the previous <br /> quarter, but toluene and total xylenes concentrations increased BTEX concentrations decreased <br />' significantly in MW-2A No petroleum hydrocarbons were detected in upgradient well MW-9 <br /> This completes the requirement for MTBE sampling at the Human Services Administration <br /> Building Because MTBE was not detected, further sampling for MTBE w;II not be conducted <br />' These results are consistent with the seasonal variations observed in the water table over the past <br /> 2 years, except that the BTEX concentrations in MW-2 have increased Groundwater flows into <br />' a trough and then to the northeast with a horizontal gradient of 0 002 ft/ft <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> NCAS7n�d5PROJ£CTSlSANJOQMSAUQ9MPC WPD 6 <br />