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Permit Revision Adequacy Comment Response November 3Q 2004 Page 14 of 24 •75. Please describe the significance of the "angle of major influence" as defined on page 2.05-114 and section 5.6 of Exhibit 60B and relate how that applies to the SOD situation at the West Elk Mine. MCC Response: The significance is that it was used in the computer modeling. Text updated. 76. On page 2.05-117, the first two number statements, please reiterate the predicted values for clarity in the text. MCC Response: Revised text. 77. On page 2.05-119, in the section titled "Potential Impact of Water..." does MCC have any estimate of the probability of water effecting vertical displacements in the SOD based on drilling or other observations? MCC Response: Revised text. 78. The compilation of locations of steep slopes with potential for rockfalls on page 2.05-120 is informative, but the Division requests that MCC provide a map showing these azeas in relation to proposed panel layout. Areas of greatest crack formation aze predicted above barrier pillazs, for example, so the DMG believes that an evaluation of locations where the barrier pillars may occur beneath cliff faces and other potentially sensitive features is necessary for prediction of areas susceptible to rockfall. MCC Response: MCC completed a baseline report and map included as Exhibit 60D. 79. The Division requests that MCC collect baseline information in the areas of low to moderate rockfall potential, as noted on page 2.05-121, pazagraph 5. MCC Response: Same as No 78 above. 80. Under the heading "Possible Subsidence Consequences," number 1 predicts that no cracks will occur in the alluvium of Dry Fork or Lick Creek, implying the unconsolidated deposits there are greater than 10 feet thick. Please provide a reference to the observed thickness of the alluvium in these azeas. MCC Response: New Exhibits 60B, 60D, and text in 2.05.6 was updated. 81. On page 2.05-124, 2"d paragraph, does the author mean "Deep Creek" or Dry Fork? MCC Response: MCC made the change to Dry Fork. ~82. On page 2.05-126, 2"d pazagraph, the statement occurs "panels E through E9." Please add the panel number where appropriate.