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Mr. Zach Trujillo <br />December 17, 2015 <br />Page 11 <br />proposed by PR -4. (Refer also to items 65, 66, and 67 in this letter) Please also update the <br />permit boundary layer drawn on this figure. <br />Response: The Division has indicated in several adequacy comments that PR -04 has proposed <br />changes to the Collom Pit. It needs to be noted that PR -04 does not propose any physical <br />changes including the overall footprint of the Collom Pit as the Division indicates. The only <br />major change to the Collom Pit under PR -04 is changes in the mining and reclamation timing, <br />due to the length of the permitting process that has occurred for Colowyo to receive approval on <br />the Collom Mine Plan. That being said, the dewatering plan as approved under PR -03 has not <br />changed nor are any other changes to the dewatering plan being proposed under PR -04. <br />Therefore, the text and figures (including Figures 2.05.6-1 and 2.05.6-2) still accurately reflect <br />the dewatering plan that Colowyo intends to implement when mining activities commence at the <br />Collom Pit. <br />Figure 2.05.6-1 has been updated with the correct permit boundary as requested, and Figure <br />2.05.6-2 has been updated to make some of the verbiage consistent with terminology that has <br />been submitted under PR -04. <br />ITEM 80. CCC has made the case that the Trout Creek Sandstone is hydrologically isolated <br />from the potential effects of mining, owing to vertical separation and the presence of the K, <br />confining layer. The Division concurs that, given those conditions, the probable hydrologic <br />consequence of the activity proposed in PR -4 on the Trout Creek Sandstone is that it will not be <br />impacted; however it will be necessary to verify this prediction before final bond release. CCC <br />has not proposed a monitoring point or points that would allow such a verification to be made. <br />a. Please elaborate on the vertical separation of the Trout Creek Sandstone, and the thickness <br />and lateral continuity of the Km layer in the text (refer also to Item 68 in this letter). The <br />discussion should include the impacts of the faults mentioned in item 10 of this letter on the <br />integrity of the confining layer. <br />Response: Text has been inserted into Volume 15, Rule 2 which further defines the vertical <br />separation, thickness, and lateral continuity of the Trout Creek Sandstone as requested. <br />Additional text has also been added in Volume 15, Rule 2 which discusses the fact that there are <br />no known faults existing within the Collom Pit area. For additional information, please see the <br />adequacy response to Item 73 which was submitted to the Division on November 20, 2015. <br />Finally, Colowyo has included a monitoring well in the Trout Creek Sandstone. Text regarding <br />this well has been inserted into Volume 15, Rule 4. <br />b. Please provide references in the text to supporting data. <br />Response: A reference has been included in Volume 15, Rule 2 as requested. <br />A T)nch-n,rr Enri t uc E crates <br />