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COLORADO <br /> \/ Division of Reclamation, <br /> ® Mining and Safety <br /> Department of Natural Resources <br /> December 3,2021 <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. 150(TR-150) <br /> Second Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing adequacy responses from Colowyo Coal Company L.P.(Colowyo)regarding the Division's <br /> initial adequacy letter regarding TR-150,the Division has the following comments: <br /> 1. The Division requests additional clarification in regards to Table 4, 7 and 8 of Exhibit 7,Item 16. <br /> For Table 4,please provide further explanation within Exhibit 7,Item 16 regarding the sources <br /> for the values in the columns "Field Salinity Threshold" and"Field Irrigation Water Quality <br /> Threshold".Additionally,please provide additional explanation within Exhibit 7,Item 16 of the <br /> source of the values in the column "Percent Yield Decrease per Unit Increase in Conductivity of <br /> Irrigation Water,by Species"for Tables 7 and 8. <br /> This concludes the Division's adequacy review for the Colowyo TR-150. If you have any questions,feel free <br /> to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Trujillogstate.co.us <br /> flF'�010 <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 I Dan Gibbs, Executive Director I Virginia Brannon, Director * 1876 * <br />