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Rob Zuber <br />Page 3 <br />October 14, 2015 <br />In summary, the data provided are not sufficient to adequately characterize the material that <br />will be disturbed by the proposed Collom pit. The analysis, as currently presented, <br />underestimates the proportion of material that fails to meet the suitability criteria. <br />a. Please revise table 2.04.6-5 to better reflect the content of the Wyoming DEQ <br />reference cited. <br />b. Please present additional data that will allow more adequate characterization of the <br />overburden material in the Collom pit; pursuant to rule 2.04.6(2)(b)(ii) the Division <br />suggests an initial spacing of one hole per 80 acres. <br />c. Please revise Exhibit 6, Item 9; tables 2.04.6-6 and -7; and the text of Volume 15, Rule <br />2, Pages 15-18 accordingly. <br />d. In the process of addressing items b. and c., please be specific about which horizons <br />will be handled selectively and how that will be accomplished. <br />Rule 2.04.7 — Hydrology Description <br />8. In volume 1, some of the footer information gives the permitting action revising those pages as <br />PR -06. <br />Please change the footer to refer to PR -04 throughout. <br />9. In Volume 15, Rule 2, Page 14, it is stated that "The stratigraphic thickness of the Williams Fork <br />Formation in the Colowyo revised permit area is about 1,700 feet." Later, on Page 19, it is stated <br />that "The overlying Williams Fork Formation consists of up to about 1,200 ft of alternating beds <br />of sandstone, sandy shale, mudstone, and coal." <br />Please resolve the apparent inconsistency concerning the thickness of the Williams Fork <br />Formation, (see also Rule 2, Page 21). <br />10. Two faults are described in Volume 15, Rule 2, Page 21, but are not shown on Map 7A (or Map <br />1013). <br />Please draw the faults on Maps 7A and 1013. Please also update the text of section 2.04.6 to <br />include a description of these faults. <br />11. Under the subheading "Groundwater Occurrence", in Volume 15, Rule 2, Page 21, the text refers <br />to bedrock and valley fill monitoring wells relevant to PR -4 presented in Table 2.04.7-38. This <br />table contains 34 wells, whose locations are mapped on Map 1013. Several questions relate to <br />the table: <br />a. The MWC-04-05 wells are marked on the map as MWC-04-05FS and MWC-04-05FG. <br />The table also has a MWC-04-05H, but this is not shown on the map. Please clarify and <br />update either the map or the table accordingly. <br />b. The map shows a well marked C-04-16. The table shows a well named C -04-16B. <br />Please clarify. <br />