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♦1 0 <br />Mr. Zach Trujillo <br />January 27, 2016 <br />Page 3 <br />Response: Please see response to comment Item 70(a). Volume 15, Rule 2, pages 17-18 have been <br />revised in an attempt to clarify the drill hole data that is summarized in Exhibit 6, Item 9. <br />d. In the process of addressing items b. and c., please be specific about which horizons will be handled <br />selectively and how that will be accomplished. <br />Response: A new data analysis that has been presented in Section 2.04.6, Exploration Test Boring <br />Results Summary indicates (based on Colowyo's overburden monitoring program) that selective handling <br />for overburden is not necessary. Data presented and approved under PR -03 in Section 2.05.6(3) also <br />provides additional documentation indicating that overburden present at the Collom Mine does not <br />require selective handling. Finally, Colowyo did not propose any changes to Sections 2.04.6 or 2.05.3(6) <br />under PR -04, and the overall plan for the Collom Pit is virtually the same as was permitted and approved <br />under PR -03. That being said, the Division has already concurred and approved under PR -03, that <br />selective handling for the Collom Pit is not necessary based upon the same exact data set (Exhibit 6, Item <br />9). For further information on the Division's prior decision, please refer to Section B.III.E in the <br />Division's "Proposed Decision and Findings of Compliance for the Colowyo Coal Mine C-1981-019 <br />Permit Revision No. 3", dated April 10, 2013. No updates were made in regards to this comment. <br />Also included with this adequacy response package are revised materials and a change of index <br />sheet to ease incorporation of revised materials into the permit document. If you should have any <br />additional questions or concerns, please feel free to contact Tony Tennyson at (970) 824-1232. <br />Sincerely, <br />Al <br />Barbara A. Walz ' <br />Senior Vice President <br />Policy & Compliance <br />Chief Compliance Officer <br />BAW:TT:dbr <br />Enclosure <br />cc: Dan Casiraro (via email) <br />Juan Garcia (via email) <br />Chris Gilbreath (via email) <br />Tony Tennyson (via email) <br />File: Colowyo CF 1.1.4.4 <br />G471 -11.3(21)a <br />AN EOUAL OPPORTUNITY/AFFIRMATIVE ACTIOINI EMPLOYER <br />A Touchstone Energy* Cooperative ; <br />