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Technical Revision (TROT -10) Adequacy Responses <br />Page 6 <br />2.05.3-E2.E-1 and 2.05.3-E2.E-2 as the modeling demonstrations for the 10 year and 25- <br />year, 24-hour design storm events. Please provide updated 10 year, 24-hour and 25 yr, <br />24-hour SEDCAD demonstrations for the Revised Upper Sump and the Revised Lower <br />Sump proposed in the TR-01 application in accordance with Rules 4.05.6(3), 4.05.6(4), <br />4.05.6(5), 4.05.6(6), 4.05.9(1), 4.05.9(2)(6), and 4.05.9(2)(c)(ii). <br />Response: Updated 10-year, 24-hour and 25-yr, 24-hour SEDCAD demonstrations for the <br />Revised Upper Sump and the Revised Lower Sump are attached. <br />If there are further questions, please don't hesitate to contact me. <br />Best regards <br />B. Scott Cowman <br />Senior Environmental Specialist <br />Sage Creek Coal Company <br />Peabody Sage Creek Mine <br />cc: Jennifer Maiolo (BLM) <br />Carl Johnston (OSMRE) <br />Routt County Clerk and Recorder <br />Mike Ludlow (PSCM)