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August 24, 2010 C-1981-019/Colowyo Coal Mine JRS? <br />The total area requested for Phase I Bond Release for the East Pit was 365.89 acres. Based on the data points <br />taken and the cross-sections (attached) created by the Division from that data, it appears as though Colowyo has <br />achieved their approved post-mining topography for the Phase I areas of the East Pit. <br />West Pit Post-Mining Topography <br />X-Section B Northing Easting GPS Adj Adj Elev Map 19 Diff Date Station <br />74 4460672.101 259238.150 7,141.3 54 7,195.3 7180 15.3 21-Jul-10 0 <br />70 4460744.162 259369.320 7,172.1 54 7,226.1 7215 11.1 21-Jul-10 490 <br />66 4460820.931 259472.058 7,201.7 54 7,255.7 7250 5.7 21-Jul-10 909 <br />64 4460926.122 259626.175 7,234.5 54 7,288.5 7285 3.5 21-Jul-10 1522 <br />60 4460981.229 259789.034 7,216.4 54 7,270.4 7270 0.4 21-Jul-10 2086 <br /> <br />X-Section C Northing Easting GPS Adj Adj Elev Map 19 Diff Date Station <br />78 4460535.981 259263.481 7,185.4 54 7,239.4 7225 14.4 21-Jul-10 0 <br />79 4460633.959 259301.611 7,183.1 54 7,237.1 7225 12.1 21-Jul-10 345 <br />70 4460744.162 259369.320 7,172.1 54 7,226.1 7215 11.1 21-Jul-10 769 <br />68 4460886.356 259410.957 7,119.2 54 7,173.2 7165 8.2 21-Jul-10 1255 <br /> <br /> <br />X-Section D Northing Easting GPS Adj Adj Elev Map 19 Diff Date Station <br />52 4460625.512 260253.614 7,276.1 54 7,330.1 7325 5.1 21-Jul-10 0 <br />56 4460809.934 259885.398 7,201.2 54 7,255.2 7250 5.2 21-Jul-10 1351 <br />62 4460882.104 259667.563 7,288.2 54 7,342.2 7340 2.2 21-Jul-10 1815 <br />64 4460926.122 259626.175 7,234.5 54 7,288.5 7285 3.5 21-Jul-10 2285 <br /> <br />GPS = Elevation measured by Trimble GeoXT <br />Adj = Elevation adjustment based on true elevation at GT-10 <br />Adj Elev = Adjusted elevation <br />Map 19 = Post-mining topography elevation as shown on Map 19 <br />Diff = Adj Elev-Map 19 <br />Date = Date data was collected <br />Station = Station for attached cross-sections <br />The total area requested for Phase I Bond Release for the West Pit was 49.44 acres. Based on the data points taken <br />and the cross-sections (attached) created by the Division from that data, it appears as though Colowyo has <br />achieved their approved post-mining topography for the Phase I areas of the West Pit. <br />Number of Partial Inspection this Fiscal Year: 3 <br />Number of Complete Inspections this Fiscal Year: 0 <br />Page 4 of 39