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COLORADO <br /> . _/ Division of Reclamation, <br /> ® Mining and Safety <br /> Department of Natural Resources <br /> Interoffice Memorandum <br /> Date: December 1, 2021 <br /> From: Rob Zuber RDZ <br /> To: Zach Trujillo and Jason Musick <br /> Subject: Colowyo Coal Mine(Permit No. C-1981-019) <br /> Second adequacy review of TR-150 <br /> I have one more adequacy item regarding the Cedar Creek assessment: <br /> The report by Cedar Creek(Exhibit 7, Item 16)needs to be revised to provide readers with more <br /> clarification. In particular, in the text related to Table 4 (page 6), further explanation should be <br /> given regarding the sources for the values in the columns "Field Salinity Threshold" and "Field <br /> Irrigation Water Quality Threshold." Also, the text related to Tables 7 and 8 (page 9) requires an <br /> explanation of the source of the values in the column "Percent Yield Decrease per Unit Increase in <br /> Conductivity of Irrigation Water, by Species." <br /> pF COl0 <br /> o <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I * <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * 1 * <br />