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� T <br /> j O e <br /> T� Qom. <br /> r <br /> k �o <br /> b <br /> �o Rte, <br /> Ta <br /> a <br /> 4'0 <br /> yo <br /> �Q <br /> tiQ <br /> Q <br /> b �p <br /> e Q. <br /> 7 <br /> Figure 3. <br /> Oxygen Concentration Gradient from ORC 3-Well Barrier after 90 Days. <br /> Groundwater velocity is 15 cm/day (0.5 feet/day) and wells are spaced 2.8m (9ft) on centers. <br />