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5-10 forest vegetation 5-10 grassy vegetation adsorption ankerite approximately arsenic concentrations arsenic levels associated with taconite average input concentrations Berndt and Lapakko Biwabik aquifer boron chemical reactions clear water pool disposal of taconite drinking water quality EC levels elevated Established forest vegetation estimate exiting the pit field and laboratory flow-weighted average input fluoride concentrations fluoride levels forest vegetation 13 ground water outflow in-pit disposal Indeco Jakel and Lapakko manganese concentrations manganese levels manganese oxidation Mesabi Iron Range mg/L minerals Minorca Pit clear Missabe Mountain Pit MN DNR molybdenum concentrations molybdenum levels nd nd Operational maximum 39 Operational measurements Pit are expected Pit clear water Pit waters plant discharges precipitation pyrite rain water rhodochrosite Saint Paul seep siderite Standard reclamation 21 Summary taconite processing taconite tailings tailings basin tailings deposition tailings pore waters temporary maximum transport term ug/L ug/L Table vegetation 12 water chemistry water quality standard waters associated