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X Colowyo Coal Company <br />P-d• 5731 State Highway 13 <br />O Meeker, CO 81641 <br /> T:970-824-1500 <br />M?• <br /> <br /> 19 June 2009 <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 />RECEIVED <br />JUN 2 2 2009 <br />oivision or Kedamation, <br />Mining and Safety <br />RE: Technical Revision No. 73, Hydrologic Curve Numbers Second Round of <br />Responses to the Division's Second Adequacy Letter, Colowyo Coal Mine, Permit No. <br />C-1981-019. <br />Dear Mr. Stark, <br />Enclosed please find two copies of materials provided for Colowyo's third round of <br />responses to the Division's Second Adequacy Review of Technical Revision No. 73 - <br />Hydrologic Curve Numbers. A minor edit has been made to text in Section 1.9. Text in <br />Section 2.2 has changed, and Table 2 has been revised. All of these edits were in <br />response to review comments, and no other changes have been made. The entire text <br />submittal has been repaginated with updated footers, and these materials supersede all <br />previous versions. Given the minor nature of the changes, no comment/response document <br />is provided. <br />Colowyo has included, with the revision package, two copies of replacement pages and a <br />change of index sheet outlining said changes to this revision. Please feel free to contact me <br />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