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COLORADO <br /> ® � 0 Division of Reclamation, <br /> mil- Mining and Safety <br /> Department of Natural Resources <br /> June 14,2021 <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. 148(TR-148) <br /> Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing TR-148 from Colowyo Coal Company L.P.(Colowyo),the Division has the following <br /> comments: <br /> 1. Please submit a copy of the historical monitoring data used to derive the UTLs for Manganese, <br /> Sulfate and Total Dissolved Solids that are proposed as estimates of existing ambient quality to be <br /> used as alternatives to the Reg.41 table values.Please include a description of any other assumptions <br /> that were made during their analysis.This data should be included as an appendix to Exhibit 7,Item <br /> 19. <br /> 2. Please propose revised text, <br /> a. making explicit that the applicable standard at the POCs is the Interim Narrative Standard; <br /> b. describing how the standard has been interpreted; <br /> c. stating what the agreed parameter values are. <br /> (This could be by referenced to the Exhibit. <br /> If you have any questions,feel free to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Trujillogstate.co.us <br /> OF COlO <br /> n O <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us * <br /> * <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director 1876 <br />