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Impoundment Name <br />Erosion, Instability, <br />Structural Weakness, <br />Hazardous Conditions <br />4.05.9 (15)(a) <br />Monitoring procedures <br />and Instrumentation <br />4.05.9 (15)(b) <br />Depth of <br />Impounded Waters <br />4.05.9 (15)(c) <br />Elevation of <br />Impounded Waters <br />4.05.9 (15)(c) <br />Existing Storage <br />Capacity <br />4.05.9 (15)(d) <br />Other Structural <br />Instability or Main <br />Required <br />4.05.9 (15)(e) <br />Experienced <br />Impoundment <br />Inspector 4.05.9(14) <br />Date <br />Of <br />Inspection <br />Stock Pond A <br />None <br />Annual Inspections <br />Dry <br />7259.5 ft. <br />0.041 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond B <br />None <br />Annual Inspections <br />Dry <br />7220.0 ft. <br />0.068 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond C <br />None <br />Annual Inspections <br />Dry <br />7206.5 ft. <br />0.060 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond D <br />None <br />Annual Inspections <br />Dry <br />7222.0 ft. <br />0.042 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond E <br />None <br />Annual Inspections <br />Dry <br />7302.5 ft. <br />0.036 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond F <br />None <br />Annual Inspections <br />Dry <br />7342.0 ft. <br />0.072 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond G <br />None <br />Annual Inspections <br />Dry <br />7789.5 ft. <br />0.283 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond H <br />None <br />Annual Inspections <br />Dry <br />7870.0 ft. <br />0.219 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond 1 <br />None <br />Annual Inspections <br />Dry <br />7821.5 ft. <br />0.036 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond J <br />None <br />Annual Inspections <br />Temporarily covered by topsoil stockpile <br />C. Brown <br />8/16/2011 <br />Stock Pond K <br />None <br />Annual Inspections <br />Dry <br />7889.0 ft. <br />0.990 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond L <br />None <br />Annual Inspections <br />Dry <br />7288.5 ft. <br />0.112 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />Stock Pond M <br />None <br />Annual Inspections <br />6 inches <br />7298.0 ft <br />0.038 ac -ft. <br />None <br />C. Brown <br />8/16/2011 <br />O <br />Colowyo Coal Company <br />5731 State Highway 13 <br />:vteaker, CO 81641 <br />T: 970- 824 -1500 <br />I am a Professional Engineer in the State of Colorado and a representative of Environmental Solutions, Inc. The <br />information contained in this document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation and <br />the coal permitting process in Colorado, the information contained herein is reasonable and correct to the best of my <br />experience. <br />Certified By: <br />Date: "h0/7( <br />O /I/ <br />Thomas C. eterson <br />ANNUAL IMPOUNDMENT INSPECTION <br />SMALL IMPOUNDMENTS / STOCK PONDS <br />DATE:8/16/11 <br />CF 21.1.2 Note: (d) impoundment volumes are estimated from existing as -built surveys and estimates of accumulated sediment <br />CF 17.18 2009 Revised 9/24/2009 <br />RIO TINTO <br />COLOWYO COAL COMPANY L.P. <br />T O A C ERSON <br />P.E. No. 32257 <br />