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The groundwater samples collected from all three of the groundwater monitoring wells contained <br /> 1 detectable concentrations of petroleum hydrocarbons The highest concentrations were detected in <br /> the groundwater sample collected from MW-1 7,200 micrograms per liter(µg/1) of TPH-as-diesel, <br /> 4,700 µg/l of TPH-as-gasoline, 28µg/1 of benzene, 2 6µ9/1 of toluene '1,100 µg/I of ethylbenzene, <br /> and 44 µg/1 of xylenes The five oxygenate compounds and 1,2-DCA were not detected in any of <br /> the monitoring well groundwater samples The groundwater analytical results are summarized in <br /> Table 2, and the laboratory reports are included in Appendix A <br /> Consistent with historical trends, TPH-as-diesel and TPH-as-gasoline were observed in relatively <br /> equal concentration Given the relatively low concentrations of BTEX, the absence of any <br /> oxygenate compounds, and the time duration since the USTs were in service, the gasoline <br /> ' hydrocarbons in groundwater appear to be aged and/or weathered <br /> As shown on Figures 4, 5, and 6, the lateral extent of impacted groundwater at the groundwater <br /> table is mostly defined for TPH-as-diesel, undefined for TPH-as-gasoline, and fully defined for <br /> benzene Impacted groundwater appears to be concentrated beneath the former USTs and to the <br /> west and northwest (F e , downgradient) of the former USTs <br /> • 8 <br />