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<br /> <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />Jared S. Polis, Governor | Dan Gibbs, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br /> Technical Revision No. 131 (TR-131) <br /> Adequacy Review <br /> <br />Dear Mr. Tennyson: <br /> <br />After reviewing TR-131 from Colowyo Coal Company L.P. (Colowyo), the Division has the following <br />comments: <br /> <br />1. When reviewing Table 1 – SCS Curve Numbers on Exhibit 7, Page 4, it is observed that Note 5 has <br />been removed from the table. However, the superscript still exists attached to “Reclaimed” cover for <br />a cover type of “3+ Year Growth”. Please provide the Division a reason for Note 5 removal and please <br />send a corrected proposed Table 1 – SCS Curve Numbers either removing the superscript or including <br />Note 5. <br /> <br />2. It appears to the Division that there are some acreage discrepancies between the currently approved <br />watershed area associated with the Section 28 Pond, the proposed acreage adjustments included with <br />the proposed Exhibit 7, and what has been stated under the Colowyo Mine TR-131 Application for <br />Revision. As requested under the TR-131 application, Colowyo noted an 8.1 acre reduction in <br />disturbance. However, when comparing the proposed Exhibit 7 changes provided with TR-131 to the <br />currently approved Exhibit 7, there is a 0.4 disturbed acre increase within the hydrology model as well <br />as a 20.9 acre reduction to the total watershed boundary associated with the Section 28 Pond. Please <br />provide the Division more information for these acreage discrepancies. <br /> <br />If you have any questions, feel free to contact me. <br /> <br />Sincerely, <br /> <br /> <br /> <br /> <br /> <br />Zach Trujillo <br />March 6, 2019 <br /> <br />Tony Tennyson <br />Colowyo Coal Company L.P. <br />5731 State Highway 13 <br />Meeker, CO 81641 <br /> <br /> <br /> <br /> <br />