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CHANGE SHEET FOR PERMIT REVISIONS, TECHNICAL REVISION, AND MINOR REVISIONS <br />Mine Company Name: Colowyo Coal Company <br />Page 2 of 3 <br />June 1, 2010 <br />Permit Number: C-1981-019 <br />Revision Description: TR-81 South Taylor Fill Revision <br />and PMT change <br />Volume Page, Map or other Permit Page, Map or other Permit Description of Change <br />Number Entry to be Entry to be <br />REMOVED ADDED <br />13 Exhibit 7-20-ii Exhibit 7-20-ii Update Table of Contents of Exhibit 7 Item 20 for revised West <br /> Taylor and SEDCAD modeling <br />13 Exhibit 7-20-7 Exhibit 7-20-7 - Update Table 4 with results of revised monitoring based on <br /> review comment. <br />13 Exhibit 7-20C-1 Exhibit 7-20C-1 Updated text on Introductory page of West Taylor Pond design <br />13 N/A Exhibit 7-20C-83 thru 111 New SEDCAD model for West Taylor pond <br />13 Exhibit 7, Item 20, Part E <br />i Exhibit 7, Item 20, Part E Revise permanent channel design and associated SEDCAD <br /> Pages 7-20E-1 through 10 Pages 7-20E-1 through 52 modeling <br />13 Exhibit 7, Item 20, Part G <br />I Exhibit 7, Item 20, Part G Revise terrace ditch design text and SEDCAD modeling <br /> Pages 7-20G-1 through 14 Pages 7-20G-1 through 8 <br />13 N/A Exh. 21 - Item 1 Revised geotechnical report based on review comments <br /> Third Introductory Letter <br /> Pages 1 through 31 <br />14 Map 19B Map 19B New PMT contours within the South Taylor area. Added cross <br /> section tick marks. <br />14 Map 206 Map 206 Numerous revisions to sections due to PMT change. Postmining <br /> Topography change (PMT TR81 0510). "South Taylor Fill <br /> Design" text and line has been added to the legend. Zones of <br /> Highwall mining were put on the cross sections STA-A', STC-C' <br /> & STD-D'. Added Postmining Topo prior to TR81 to all cross <br /> sections. Edited the permanent valley fill hatch, permanent fill <br /> within the pit limits hatch,and the temporary fill hatch to all <br /> sections. Revised the Pit Floor on all cross sections <br />14 Map 23A Map 23A Revised permanent fill limits, updated topography, HWM limits <br />Page 2