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1 <br /> The distribution of MTBE in groundwater is depicted in Figure 5 The isoconcentration map <br /> shows that the lateral extent of MTBE in groundwater appears to be defined on the south side <br /> and southeast corner of the site and undefined on the southwest corner, west, north and east <br /> sides of the site <br /> The groundwater sample collected from SB-10, northeast of the UST excavation, also contained <br /> the highest concentrations of TBA at 180 µg/l, TAME at 14 µg11, and DIPE at 3 8 �Igll Ethanol <br /> ' was detected in groundwater in one soil boring (SB-11) at a concentration of 5 6 µg11 The only <br /> oxygenate compounds not detected in groundwater from any of the 11 sod borings were ETBE <br /> and methanol <br /> i <br /> i <br /> 14 <br /> r <br />