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Colowyo Coal Company <br />2011 Annual Reclamation and Hydrology Report <br />Figure 11 -4 - Topsoil Schedule for Mining Area <br />Topsoil Balance As of December, 2011 <br />1 Disturbed Lands 4,800.06 acres <br />(See Annual Report Information) <br />2 Lands with Redistributed Topsoil 1,966.65 acres <br />(See Annual Report Information) <br />3 Lands Yet to be Retopsoiled (Line 1 Minus 2) 2,833 acres <br />4 Lands Yet to be Retopsoiled 123,423,000 sq. feet <br />5 Volume of Topsoil in Stockpiles 4,276,315 cu. yards` <br />(from Exhibit 11B of Annual Report) <br />6 Line 5 times 27 115,461,000 cu. ft <br />7 Average Replacement Depth Available 0.94 feet <br />(Line 6 divided by Line 4) <br />6 Average Replacement Depth Available 11.23 inches <br />Note: Values presented above represent an estimate of areas and volumes as of the date shown above. <br />Stockpile inventories change frequently as mining plans vary. <br />Page 11 -6 <br />