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provide rationale for each HSG and SCS /NRCS curve number used for the TR -55 <br />analysis. Please keep in mind the vegetation and origin of the material when selecting <br />curve numbers, especially for unvegetated waste rock, topsoil, and ore piles. <br />Once these issues are addressed the Technical Revision can be approved. However at this time <br />staff is advising Rimrock to request an extension of the decision date of September 30, 2011 to <br />allow adequate time for an operator response and review by the Division. <br />If you need additional information please contact me at the Division of Reclamation, Mining and <br />Safety, Grand Junction Field Office, 101 S. 3rd St., Suite 301, Grand Junction, Colorado 81501, or <br />by telephone no. 970.241.1117. <br />G. Russell Means <br />Environmental Protection Specialist II <br />Ec: Tim Cazier, DRMS Engineer, Denver <br />