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n <br /> „ <br /> The groundwater samples collected from all three monitoring wells contained detectable <br /> concentrations of petroleum hydrocarbons The highest concentrations were detected at MW-1 <br /> This sample contained 5,400 µg11 of TPH-as-gasoline, 2,300 µg11 of benzene, 140 µg11 of <br /> ethylbenzene, and 51 µg11 of xylenes MTBE was not detected in any of the groundwater <br /> samples Concentrations of DIPE (0 6 µg11) and TBA (9 9 µg11) were only detected in the <br /> groundwater sample collected from MW-3 The groundwater sample analytical results are <br /> summarized in Table 4, the concentrations of petroleum hydrocarbons in groundwater are posted <br /> on Figure 4, and the laboratory reports are included in Appendix B <br /> Between September 15, and December 19, 2003, the concentrations of petroleum hydrocarbons <br /> in groundwater generally remained relatively stable at MW-1 and MW-2, and decreased at MW-3 <br /> Since the three monitoring wells were installed in November 2002, the concentrations of <br /> petroleum hydrocarbons in groundwater have remained relatively stable <br /> In groundwater, petroleum hydrocarbons appear to continue to be concentrated beneath the east <br /> side of the former fuel farm To the north and south of the former fuel farm, lower concentrations <br /> 1 of petroleum hydrocarbons in groundwater suggest that the impact attenuates by natural <br /> processes The lateral extent of impacted groundwater remains undefined <br /> t <br /> 7 <br />