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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />Figure 6-3 — Overall Topsoil Balance for Report Year <br />Topsoil Balance As of December, 2017 <br />1 Disturbed Lands 3,818.2 acres <br />(See Annual Report Information) <br />2 Lands with Redistributed Topsoil 1,178.2 acres <br />(See Annual Report Information) <br />3 Lands Yet to be Retopsoiled (Line 1 Minus 2) 2,640 0 acres <br />4 Lands Yet to be Retopsoiled 114,998,000.0 sq. feet <br />5 Volume of Topsoil in Stockpiles 4,588,671.1 cu yards* <br />(from Figure 7-1) <br />6 Line 5 times 27 123,894,000.0 cu. ft <br />7 Average Replacement Depth Available 1.1 feet <br />(Line 6 divided by Line 4) <br />8 Average Replacement Depth Available 12.9 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 50 <br />