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D <br />rNR <br />O ow <br />September 9, 2018 <br />COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Tony Tennyson <br />Colowyo Coal Company L.P. <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br />Technical Revision No. 123 (TR -123) <br />Adequacy Review <br />Dear Mr. Tennyson: <br />After reviewing TR -123 from Colowyo Coal Company L.P. (Colowyo), the Division has the following <br />comments: <br />1. Colowyo's comparison of Danforth Hills Aspen Study Area cover data and Collom Aspen <br />Reference Area cover data was acceptable, but the "Reference Area Statistical Comparison <br />Table" needs to reflect that 15 transects were collected in 1984 not 13. Likewise on this table, the <br />comparison of Danforth Hills Aspen Study Area production data and Collom Aspen Reference <br />Area production data was acceptable, but the table needs to reflect that 13 transects were <br />collected in 1984 not 15. Please update the "Reference Area Statistical Comparison Table" with <br />the correct number of transects. <br />2. On the Exhibit 10 -Item 6, "Reference Area Statistical Comparison table", Colowyo used a <br />vegetative cover value of 74.3% for the 1984 Danforth Hills Aspen Reference Area value in its <br />comparison with the 2005 Collom Aspen Reference Area. The Division was unable to locate <br />where Colowyo found the 74.3% cover value. All of the 1984 Danforth Hills data show that the <br />Aspen Reference Area cover was 78.1%. CCC also submitted a new Table 5 that reiterates the <br />"Danforth Project Vegetation Cover -1984 Aspen Reference Area" with yet a different value for <br />the 1984 Aspen Reference Area vegetative cover of 94.27%. Exhibit 10 -Item 5, Tables 3.3, 3.6, <br />and the tabulated data sheet for the 1984 Aspen Reference Area all report 78.1% vegetative <br />cover. Please correct the value for the 1984 Aspen Reference Area cover, re -run the comparison, <br />and resubmit the table. <br />If you have any questions, feel free to contact me at any time. <br />Sincerely, <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director <br />