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RECEIVED <br />March 2, 2009 <br />MAN U 4 2009 <br />Division or Reclamation, <br />Mining and Safety <br />Mr. James R. Stark <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. 73, Hydrologic Curve Numbers Preliminary Adequacy Review <br />Response, Colowyo Coal Mine, Permit No. C-81-019. <br />Dear Mr. Stark, <br />Enclosed please find two copies of materials provided for Colowyo's response to the Division's <br />Preliminary Adequacy Review of Technical Revision No. 73 Hydrologic Curve Numbers. Please <br />note that Colowyo is not making any changes to the previously presented curve number values, only <br />providing additional support and explanation for their use. Colowyo has included, with the revision <br />package, replacement pages and a change of index sheet outlining this revision. Please feel free to <br />contact me at (970) 824-1578 if you have any questions. <br />Sincerely, <br />Ryan Pawlowski <br />Environmental Engineer <br />Encl. 2 copies <br />Cc: file CF 1.1.2.62 <br />Ryan Pawlowski <br />Environmental Engineer <br />(970) 824-1578