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Geochemical measurements in MLS wells (days 135 to 720). Ethanol injection and groundwater sampling dates (A) and concentrations of nitrate (B), sulfate (C), and uranium (D) are shown. Black closed circles indicate time points at which samples were taken: 1, active U(VI) reduction phase (days 137 to 304); 2, continuous-reduction phase (days 304 to 621); 3, maintenance phase (days 622 to 720).
