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<br /> <br />thereby contained acid neutralizing rock throughout that volume. However, the <br />diatreme has a lip, of sorts, that covers a larger surface than occurs at depth. Thus, the <br />abundance of acid neutralizing material in much diminished than previously modeled. <br />8. The hydrologic picture developed for DMG should be consistent with the one being <br />developed for the CDPHE. <br />9. The installation of caps or low permeability covers over any of the waste rock areas <br />will decrease the rate of infiltration into the diatreme, and therefore the rate of discharge from <br />the Carlton tunnel. This will have to be factored into the model. <br />10. Water discharge from the Roosevelt tunnel, which was not considered in previous <br />models, must be considered. <br />11. Water quality of the Roosevelt tunnel discharge, and the internal flow within the <br />Moffatt should be fattored into the model. <br />12. Core records that may be used to verify the presence of carbonate in the diatreme, <br />must be treated quantitatively. <br />The abundance of alkaline material available to the fluids must be treated in a realistic <br />way. Pyritic rock that will be blasted or otherwise crushed and placed in waste rock <br />piles where it will produce acid will have a surface area that will be thousands of times <br />greater than the surface area of in-place bedrock that may contain acid-neutralizing <br />minerals. Realistic water to rock ratios must be developed for this situation in order to <br />adequately model the hydrologic situation. <br />13. If capping or covering is selected as a means of controlling the acid and metals source <br />areas, the post-cap (post-cover) acid generating potential of these caps must be quantified, and <br />the cap cover designs made to address an adequately protective system. <br />cc: Jim Pendleton <br />