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CHANGE SHEET FOR PERMIT REVISIONS, TECHNICAL REVISION, AND MINOR REVISIONS <br />Mine Company Name: Colowyo Coal Company <br />Permit Number: C-1981-019 <br />Page 2 of 2 <br />August 5, 2010 <br />Revision Description: TR-88 West Taylor Temporary <br />Out of Pit Stockpile <br />Volume Page, Map or other Permit Page, Map or other Permit <br />Number Entry to be Entry to be <br />REMOVED ADDED <br />Description of Change <br />13 N/A Exhibit 7-20C-83 thru 98 New Figures 1 C-4 and 1 C-5 and new SEDCAD model for West <br /> Taylor Pond, active mining case <br />13 N/A Exhibit 7-20C-99 thru 112 Added new SEDCAD model for West Taylor Pond, active <br /> mining case 25 r event <br />13 N/A Exh. 21 - Item 1 Attached geotechnical report dealing with spoil pile stability <br /> Third Introductory Letter <br /> Pages 1 through 31 <br />14 Map 23A Map 23A Added temporary fill limits, updated topography, HWM limits <br />Note: Bold text denotes materials provided with this submittal. <br />Page 2