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Page 1 of 1 <br />CHANGE SHEET FOR PERMIT REVISIONS, TECHNICAL REVISION, AND MINOR REVISIONS Submitted May 8, 2008 <br />Mine Company Name: Colowvo 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. Table 1 has been <br />revised with this submittal and the associated curve numbers modified <br />from the prior submittal. Added paragraph to Section 1.9 that is similar <br />to the text in the approved document. Note: Table 6 is not changed <br />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 No Change <br />14 No Change <br />Page 1