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Colowyo Coal Company <br /> 2o107Annual Reclamation and Hydrology Report <br />i~ <br /> Figure 11-4 - Topsoil Schedule for Mining Area <br /> Topsoil Balance As of December, 2007 <br /> 1 Disturbed Lands 4,230 acres <br /> (See Annual Report Information) <br /> 2 Lands with Redistributed Topsoil 1,647 acres <br /> (from Exhibit 11A of Annual Report) <br /> 3 Lands Yet to be Retopsoiled (Line 1 Minus 2) 2,582 acres <br /> 4 Lands Yet to be Retopsoiled 112,490,000 sq. feet <br /> 5 Volume of Topsoil in Stockpiles 3,832,035 cu. yards* <br /> (from F,xhibit 11B of Annual Report) <br /> 6 Line 5 times 27 103,465,000 cu. ft <br /> 7 Average Replacement Depth Available 0.92 feet <br /> (Line 6 divided by 4) <br />• <br /> 8 Average Replacement Depth Available 11.04 inches <br /> Note: Values presented above represent an estimate of areas and volumes as of December, 2007, <br /> a particular point in time. Stockpile inventories change frequently as mining plans vary. <br />* a portion of topsoil stockpile quantity is estimated for 2007 activities based on load count. <br /> <br />Page 11-6 <br />