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Figure 7. Dissolved Oxygen Concentrations in UVB annulus wells ' <br /> i <br /> 10 x <br /> E <br /> � r <br /> 0 <br /> CD <br /> O <br /> .a <br /> 0] <br /> 5 <br /> O <br /> N <br /> a <br /> i <br /> 0 <br /> 0 10 20 30 40 50 60 70 80 90 <br /> operating time (days) <br /> deep annulus well --.-- shallow annulus well �' <br />