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1 <br /> 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 µg/l of benzene, 2.7 [cg/l of toluene;87.1 µg/l of ethylbenzene, <br /> 49.8 µg/I of xylenes, and 2.7 µg/l of MTBE. Only MTBE was detected in MW-2 at 4.1 µg/1 and in <br /> MW-3 at 2.8 jig/I. 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 /> .r <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 /> er 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 /> state of California Secondary Maximum Contaminant Level (MCL) of 5 µg/l. <br /> y <br /> I <br /> w _ <br /> I <br /> i <br /> L i <br /> r <br /> 8 <br />