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Mr. Zach Trujillo <br />December 17, 2015 <br />Page 7 <br />the locations of all geologic cross-sections on Map 7A. If the same figures are to be used in <br />order to comply with rule 2.04.7 the cross section locations should also be shown on Map IOB. <br />Response: A response to this comment was submitted on November 20, 2015. <br />ITEM 66. The cross sections shown in Figure 2.04.6, Sheets I and 2 are drawn at a scale of 1 " <br />= 400' (horizontal and vertical), with more than 70 stratigraphic layers. The scale makes it <br />extremely difficult to extract relevant information from the figures (particularly the thickness of <br />the Km layer). Please redraw the cross-sections with vertical exaggeration. A scale of 1 " = 50'- <br />100' on the vertical axis would be appropriate. <br />Response: A response to this comment was submitted on November 20, 2015. <br />ITEM 67. The legend on Figure 2.04.6, Sheets 1 and 2, shows layers marked "Pit Shell <br />"TCT" and "STCM" in addition to the 70+ identified coal seams. These layers appear not to <br />have been drawn. Furthermore, it is not clear what "TCT" and "STCM" refer to. Per the text, <br />the lowest coal seam to be mined is GB which is shown in blue on the cross-sections. The <br />Smectite layer (K„,), which has been identified as a laterally continuous low permeability layer, <br />is shown in pink. Please clarify the terms used in the legend. Please also display the first aquifer <br />below the lowest coal seam to be mined (presumably the Trout Creek Sandstone) on the cross- <br />section. <br />Response: A note has been added to Figure 2.04.6 Sheets 1 and 2 which defines TCT and <br />STCM. Additionally, a note has also been added which denotes that the TCT is the first regional <br />aquifer below the lowest seam to be mined. <br />ITEM 68. In Volume 15, Rule 2, Page 13 the text reads "The Trout Creek sandstone underlies <br />the lowest surface recoverable seam to be mined at South Taylor (the G789 seams) by <br />approximately 590 feet ". Please revise this section of text to refer to the separation between the <br />Trout Creek sandstone and the lowest seam to be mined in the vicinity of the proposed Collom <br />pit and use this value consistently throughout the text of volume 15. Please also cite the data that <br />allows CCC to accurately assess the separation over this area. (Refer also to item 80 in this <br />letter.) <br />Response: Text has been inserted in Volume 15, Rule 2 that further defines the separation <br />between the Trout Creek Sandstone and the lowest seam to be mined as requested. Also, noted <br />in the narrative is that this separation is based on exploration drill hole data that Colowyo has <br />obtained over many subsequent years of exploratory drill in the Collom expansion area. <br />ITEM 69. In Volume 15, Rule 2, Page 16 a paragraph appears to have been inserted that is not <br />relevant to the Collom area: "Overburden and interburden samples from drill holes 97-06, 97- <br />09 ... ". For clarity, please remove irrelevant text. <br />q Tnuih;rnnc Enct,v`C':xperm e <br />