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Mr. Zach Trujillo <br />December 17, 2015 <br />Page 10 <br />ITEM 75. Completion information for the monitoring wells was not readily located. Please <br />refer, in the text or as a footnote to table 2.04.7-38, to sources for well completion information, <br />including the screened interval, for all monitoring wells. (For example: Exhibit 26, Item I in <br />Volume 20 has completion information for 5 of the 34 wells described in table 2.04.7-38). <br />Response: Completion information for the monitoring wells can be found in Exhibit 7, Item 21, <br />Appendices 5.A and 5.B. A note has been added to Table 2.04.7-38 indicating this also. <br />ITEM 76. In Volume 15, Rule 2, Page 22, the text refers to well DH -76-8 in the description of <br />water levels in the Trout Creek Sandstone. Please draw well DH -76-8 on Map IOB. <br />Response: Please refer to Map 11 B for the location of well DH -76-8. <br />ITEM 77. The text in Volume 15, Rule 2, Page 22, also describes potentiometric head values at <br />several points in the Trout Creek Sandstone. It is not clear from the material that has been <br />submitted how well characterized the potentiometric surface in the Trout Creek Sandstone is in <br />the vicinity of the proposed Collom pit. Such characterization of the baseline conditions will <br />allow an assessment of the veracity of the Probable Hydrologic Consequences (PHC) later in the <br />life of the permitted operation. Please project the baseline potentiometric surface in the Trout <br />Creek Sandstone over the Colowyo permit area, including the proposed Collom expansion, onto <br />a map (possibly Map IOB). The map should identify the points that were used in the projection. <br />Depending on seasonal variability, it may be appropriate to show a maximum and minimum <br />projected surface. If CCC has already addressed this characterization through previous mapping <br />or modeling workplease direct DRMS to the appropriate documentation. <br />Response: Map IOB has been updated with the projected potentiometric surface of the Trout <br />Creek Sandstone as requested. Text has been inserted into Volume 15, Rule 2 which discusses <br />the locations of the wells that were used to determine the projected potentiometric surface. <br />ITEM 78. Table 2.05.6-4 gives an inventory of springs and seeps near the proposed Collom <br />permit expansion area. Since PR -4 changes the nature of the proposed expansion, some of the <br />information in the table is no longer precisely relevant. Please review Table 2.05.6-4 and <br />update the information in column 3 (Direction from Proposed Pit) to incorporate the changes to <br />the proposed Collom pit. <br />Response: A response to this comment was submitted on November 20, 2015. <br />ITEM 79. Figures 2.05.6-1 and -2 show a plan and cross-sectional view of the proposed Collom <br />pit, with dewatering wells and their cones of influence projected. Since PR -4 changes the details <br />of the proposed pit, some of the information shown may no longer be accurate. Please review <br />Figures 2.05.6-1 and -2 and verify that the information shown accurately reflects the plan <br />A Tui�h�r�_n�e Ener�„e'�:ou�crame <br />