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Tony Tennyson, Environmental Engineer <br />April 23, 2012 <br />Mr. Rob Zuber <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Technical Revision No. 95, Hydrologic Methods Revision, Permit No. C 1981 - 019. <br />Dear Mr. Zuber, <br />Enclosed please find two copies of Technical Revision (TR) 95. TR -95 revises Volume 2D, and <br />Volume 13, Exhibit 7 Hydrology, which address the basis for the selection of the hydrologic <br />Curve Numbers (CN) used in estimating runoff volumes and flow rates resulting from rainfall on <br />reclaimed mined lands. <br />Also included with this technical revision is a revision application, proposed public notice and a <br />change of index sheet to ease incorporation into the permit document. If you have any questions <br />or require additional information, please feel free to contact me at your convenience at (970) <br />824 -1532. <br />Sincerely, <br />Encl. 2 copies <br />Cc: file CF 1.1.2.84 <br />Tony Tennyson <br />Environmental Engineer <br />5731 Highway 13 <br />Meeker, Colorado 81641 <br />970 - 824 -1500 <br />970 - 824 -1532 <br />