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<br />Ms. Lori Potter <br />October 10, 1999 <br />Page 4 <br />ATTACHMENT B, SPECIFIC COMMENTS <br />Section 1.0. Page 1, Paragraph 2. Lines 2, 3 and 4 <br />Inc <br />Please present the results of the "second approach" and discuss why it was apparently dismissed. <br />Section 1.0, Page 1, Paragraph 3, Lines 6, 7 and 8 <br />Please define the redox conditions necessary to precipitate manganese minerals, and then describe the <br />redox data from the laboratory tests. Is the redox potential in the laboratory tests apprdaching that <br />necessary to precipitate manganese compounds? <br />Section 1.0, Page 1, Paragraph 4 <br />To allow the "release of excess pit water by seepage to the Rito Seco," BMRI must turn) off the West Pit <br />dewatering system. With the pumps off, the pit will refill will water. This will cause thle backfill rock, <br />which had been located above the artificially suppressed West Pit water table, to becodne re-saturated. <br />Please discuss the geochemical implications of re-saturating this material. <br />Section 1.1. Page 2,Paragraph 1 <br />The lab columns were tested with water from the West Pit (well BF-2) and the "third" column was filled <br />with waste rock from the West Pit. However, the Pilot Test will occur in the Pink Gneiss Pit. Please <br />compare water quality from wells BF-2 and BF-7. Discuss major differences in water quality between <br />these two wells (i.e., iron concentrations are quite different) and how they can be expetted to impact the <br />Pilot Test, if at all. In addition, please compare available data on West Pit backfill material and the Pink <br />Gneiss backfill material. Again, discuss how geochemical differences can be expectedRo impact the Pilot <br />Test, if at all. <br />Section 1.1 Page 3, Paragraph 2. Lines 3 and 4 <br />Please quantify "large quantities of manganese." <br />