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COMME*1TS ON PROPOSED PILOT TESTING OE MICROBIOLOGICAL WATER <br />... TREATMENT <br />Comment 1. P. 1, 1 3. The text indicates shat Fe-bearing rocks (presumably pyritic <br />rocks] will reed with dissolved sulfide to prac;pilate metal bearing solids. Is this correct <br />or; it seems that the already dissolved metals are what will ccmbine with dissolved <br />sulfide !o tone stable sutflde-bearing solids. If not, then what will happen to the <br />dissolved metals? <br />Comment 2. Same. Haw can dissolved Mn concantretlons dacrcase under redudng <br />conditions generated by the additlan of organic Carbon withcut addition of carbonate? <br />Comment 3. P. 2, top it and elsewhere. How well water In the Pink Gneiee (Pt3) pd be <br />managed? Particularly, how will Incoming flows be controlled or will they Head to be <br />controlled? WIII there b• a discharge from the PG pit and H so, will specNic controls be <br />placed on that discharge? If there Is a discharge, where will the discharge po? <br />CammeM 4. P 3. fl 2. Text Indicates that "sulur was preclpitatad. Does this rt-aen <br />native suHur, sufllda or suHale minerals? H native sulfur, will there be a need to protect <br />from further diaevlution once the organic carbon-rich environment is removed? <br />Comment 5. Same. Flow will the excess Mn be controlled? <br />_,,. Comment 6. P. 3, it 4. Text indleatas that early-Iortnad man9aneae and Iron ox>dat will <br />aerro ea'eataysts for the tormatan of adohional metal oxtdea, and altealvaly scavenge <br />(additanaq dissohrod motels." Thls doesn't seem to matte sense as catalysts do not <br />scavenge. TTte process a not clear. Plaaae ro-ndd-nss <br />Comment 7. P. 3 6 4. Tha column tests provide information for Mro systems: a sulfate <br />reducing, anaerobic systram end an aerobic system for Mn-oxidation. The aerobic <br />system is not to be employed in the proposed In-situ treatment, according to ltla lead, so <br />it Ia curious why this InlormaUOn was provided in context with the propoaad fn-situ <br />treatment. Pteaw clarity. <br />Same. The text Indk:atee, without supporting data, that Mn cnncentratione dacraesad <br />attpr 18 weeks of reaction, but it is not clear from the tax! whether dissolves Mn actually <br />precipitated as Mn•salids or was simply washed out of the system. Please clarify. <br />Same. The text (top of p. 4) Indicates that a microbtat bbmasa tonned in the procap, <br />Does this mnse hnve the potential to plug pore spaces, reduce etffcleneies or torts?? <br />contact between reactants? If so, is there any way to show That essential reactimns wl9 <br />b• maintsinad or is this to be part of the feat? What monitoring will be employed to <br />assure adequate flow through the system. <br />