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SHANNON 6WILSON, INC. <br />GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS <br />July 30, 2013 <br />Colowyo Coal Company, L.P. <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Attn: Mr. Juan Garcia <br />ALASKA <br />CALIFORNIA <br />COLORADO <br />FLORIDA <br />MINNESOTA <br />MISSOURI <br />OREGON <br />WASHINGTON <br />RE: ADDENDUM NO. 3, REVISED JULY 30, 2013 <br />GEOTECHNICAL STUDY FOR EXCESS SPOIL TEMPORARY SPOIL FILL <br />STABILITY, SOUTH TAYLOR MINE AREA, COLOWYO MINE <br />MOFFAT AND RIO BLANCO COUNTIES, COLORADO <br />We understand the temporary fill portion of the east spoil fill (defined by Section A -A on Figures <br />10 and 11 of Revised Addendum 3) will not be completed to the maximum elevation anticipated <br />in our stability analyses. <br />The top elevation considered in our stability analyses was on the order of 8,275 feet. The revised <br />top elevation is on the order of 8,150 to 8,200 feet. The toe location and fill slope angles will <br />remain essentially the same. <br />The revision'to lower the top elevation does not adversely affect the stability of the fill and <br />additional stability analyses are not required. <br />Our services were provided in accordance with our Master Consulting Contract No. M0024. The <br />opinions and recommendations presented in this report were prepared in accordance with <br />generally accepted professional geotechnical engineering principles and practice in this area at <br />1060 BANNOCK STREET, SUITE 200 <br />DENVER, COLORADO 80204 <br />PHONE 303.825.3800 <br />FAX 3030825.3801 <br />www.shannonWIson.com <br />Exhibit 21, Item 1 <br />Addendum No. 3 -32 <br />23 -1- 01105 -206 <br />Revision Date: 8/5/13 <br />Revision No. TR -99 <br />