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. KCCC — Colowyo Coal Company <br />Colowyo Coal Mine <br />Attn: Mr. Tay Tonozzi <br />April 15, 2010 <br />Page 8 <br />CLOSURE <br />SHANNON 8WILS N, INC. <br />Our services were provided in accordance with our Master Service Agreement, M366. The <br />opinions and recommendations presented in this report were prepared in accordance with <br />generally accepted professional geoteclulical engineering principles and practice in this area at <br />the time we prepared this report. We snake no other warranty, either express or implied. If you <br />have any questions or require further information, please contact me at 303 -825 -3800. <br />Sincerely, <br />SHANNON & WILSON, INC., <br />X00 :REG;S�� <br />• t � '�' s <br />.Yl. <br />Mark G. Gray, P.E/ Reviewed by: <br />Senior Associate Gregory R Fischer, P. E. <br />Senior Vice President <br />MGG:GRF /mgg <br />Enc: Figure 10 — Temporary Spoil Fill Locations <br />Figure 11 — Analysis Section (4 sheets) <br />Figure 12 — Summary of Spoil Strength Test Results <br />Figure 13 — Total and Effective Stress Mohr Envelopes, Clay, Boring C -104 <br />Figure 14 — Summary of Clay Strength Test Results <br />Figure 15 — Summary of Carbonaceous Mudstone Strength Test Results <br />Appendix D — Results of Slope Stability Analysis <br />23 -1- 01105 -206 Revised Addendum No 3.doc <br />23 -1- 01105 -206 <br />Exhibit 21, Item 1 Revision Date: 12/06/10 <br />Addendum No. 3- 8 Rev!-,!On No.-. 'VR -Al <br />