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• 4 • <br /> rd <br /> ;p <br /> i {a <br /> K <br /> �a <br /> Q, cta, <br /> 0 <br /> �a <br /> i to <br /> �a <br /> tiQ <br /> a 4 <br /> Figure 3. <br /> , <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 />