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Page 1 of 1 <br />CHANGE SHEET FOR PERMIT REVISIONS, TECHNICAL REVISION, AND MINOR REVISIONS Submitted June 18, 2009 <br />Mine Company Name: Colowyo Coal Company <br />Permit Number: C-1981-019 <br />Revision Description: TR-73 Hydrologic Curve Numbers <br />Volume Page, Map or other Permit Entry Page, Map or other Permit Entry Description of Change <br />Number to be to be <br />REMOVED ADDED <br />1 No Change <br />2A No Change <br />2B No Change <br />2C No Change <br />2D Exhibit 7, Page 1 through 7 <br />(behind July 30, 2002 WWC letter), <br />7 pages total Exhibit 7, Page 1 through 16 <br />(behind July 30, 2002 WWC letter) <br />16 pages total Updated discussion in the "Methodologies and Assumptions For <br />Sedimentation Pond Design Evaluations" in regard to acceptable curve <br />numbers to be used for future hydrologic design. Tables 1 and 2 have <br />been revised with this submittal. Added paragraph to Section 1.9 that is <br />similar to the text in the approved document. Note: Table 6 is not <br />changed from previous version except for footer information. <br />2E No Change <br />3 No Change <br />4 No Change <br />5A No Change <br />5B No Change <br />6 No Change <br />7 No Change <br />8 No Change <br />9 No Change <br />10 No Change <br />11 No Change <br />12 No Change <br />13 <br />i No Change <br />14 No Change <br />Page 1