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Consistent with previous quarterly groundwater analytical results, the highest concentrations of <br /> gasoline compounds were detected in the sample collected from MW-1 727 micrograms per liter <br /> (µg/l) of TPH-as-gasoline, 84 5 µgll of benzene, 2 7 µg/I of toluene, 87 1 µg11 of ethylbenzene, <br /> 49 8 µg11 of xylenes, and 2 7 µg11 of MTBE Only MTBE was detected in MW-2 at 4 1 µg11 and in <br /> MW-3 at 2 8 µg11 The groundwater sample analytical results are summarized in Table 2, the <br /> distribution of gasoline in groundwater is shown on Figure 5, and the laboratory reports are <br /> included in Appendix B <br /> Between September 21, and December 30, 2005, gasoline compounds in groundwater remained <br /> relatively consistent in all three wells Concentrations of gasoline compounds in groundwater at <br /> MW-1 have generally declined, since the monitoring wells were installed in July 2002, probably <br /> due to source removal efforts and natural attenuation processes Since March 2004, <br /> concentrations of MTBE have been detected in the perimeter wells (MW-2 and MW-3) During <br /> the fourth quarter of 2005, the MTBE concentrations detected in all three wells were below the <br />' S <br /> state of California Secondary Maximum Contaminant bevel (MCL) of 5 µg/l <br /> 8 <br />