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9UJbUb-»4 UUn-4L <br /> 4.3.5.4.14.3 Projection of contaminant information onto the line of <br /> cross sections can, in some cases, create apparent complications in the <br /> distribution of contamination observed in cross sections. If, for <br /> example, the cross section is located in the middle of a plume, but <br /> wells from outside the plume have been projected onto the line of <br /> section, it is possible that an uncontaminated area,.could be inferred <br /> within the center of the plume. To avoid these_complications, chemical <br /> concentration data have not been used from some of the wells on the <br /> cross sections. In particular, concentration data from Wells LM 16 and <br /> LM 61 on Cross Section A-A' and Well LM 42 on Cross Section E-E' have <br /> not been used in the construction of the concentration contours on <br /> those cross sections. <br /> 4.3.5.4.15 As can be seen from the cross sections, TCE and PCE migrate <br /> laterally in a notheasterly direction from the Depot and vertically <br /> downward from the Upper Horizon to the Middle Horizon and Lower Horizon. <br /> The vertical extent is estimated to be no deeper than about 140 feet. <br /> Further discussion of the migration of groundwater contamination is <br /> I <br /> provided in Section 5.3.3. ,,-"" <br /> - i <br /> 4- <br /> 1 -' <br /> 4,184b <br />