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Chris Gilbreath <br />Page 8 <br /> <br />Please refer, in the <br />ITEM 75. Completion information for the monitoring wells was not readily located. <br />text or as a footnote to table 2.04.7-38, to sources for well completion information, including the <br />screened interval, for all monitoring wells. (For example: Exhibit 26, Item 1 in Volume 20 has <br />completion information for 5 of the 34 wells described in table 2.04.7-38). <br /> <br />ITEM 76. In Volume 15, Rule 2, Page 22, the text refers to well DH-76-8 in the description of water <br />Please draw well DH-76-8 on Map 10B. <br />levels in the Trout Creek Sandstone. <br /> <br />ITEM 77. The text in Volume 15, Rule 2, Page 22, also describes potentiometric head values at several <br />points in the Trout Creek Sandstone. It is not clear from the material that has been submitted how well <br />characterized the potentiometric surface in the Trout Creek Sandstone is in the vicinity of the proposed <br />Collom pit. Such characterization of the baseline conditions will allow an assessment of the veracity of <br />Please project <br />the Probable Hydrologic Consequences (PHC) later in the life of the permitted operation. <br />the baseline potentiometric surface in the Trout Creek Sandstone over the Colowyo permit area, <br />including the proposed Collom expansion, onto a map (possibly Map 10B). The map should identify <br />the points that were used in the projection. Depending on seasonal variability, it may be <br />appropriate to show a maximum and minimum projected surface. If CCC has already addressed <br />this characterization through previous mapping or modeling work please direct DRMS to the <br />appropriate documentation. <br /> <br />ITEM 78. Table 2.05.6-4 gives an inventory of springs and seeps near the proposed Collom permit <br />expansion area. Since PR-4 changes the nature of the proposed expansion, some of the information in the <br />Please review Table 2.05.6-4 and update the information in <br />table is no longer precisely relevant. <br />column 3 (Direction from Proposed Pit) to incorporate the changes to the proposed Collom pit. <br /> <br />ITEM 79. Figures 2.05.6-1 and -2 show a plan and cross-sectional view of the proposed Collom pit, with <br />dewatering wells and their cones of influence projected. Since PR-4 changes the details of the proposed <br />Please review Figures 2.05.6-1 and -2 <br />pit, some of the information shown may no longer be accurate. <br />and verify that the information shown accurately reflects the plan proposed by PR-4. (Refer also to <br />items 65, 66, and 67 in this letter.) Please also update the permit boundary layer drawn on this <br />figure. <br /> <br />ITEM 80. CCC has made the case that the Trout Creek Sandstone is hydrologically isolated from the <br />potential effects of mining, owing to vertical separation and the presence of the Kconfining layer. The <br />m <br />Division concurs that, given those conditions, the probable hydrologic consequence of the activity <br />proposed in PR-4 on the Trout Creek Sandstone is that it will not be impacted; however it will be <br />necessary to verify this prediction before final bond release. CCC has not proposed a monitoring point or <br />points that would allow such a verification to be made. <br />Please elaborate on the vertical separation of the Trout Creek Sandstone, and the thickness and <br />a. <br />lateral continuity of the K layer in the text (refer also to Item 68 in this letter). The discussion <br />m <br /> <br /> <br />