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Colowyo Coal Company, L.P. <br />Attn.: Mr. Juan Garcia <br />March 10, 2015 <br />Page 7 of 7 <br />SHANNON 6WILSON. INC. <br />Enc: Figure 1 — Revised Spoil Fill Location <br />Figure 2 — Revised Spoil Fill Plan <br />Figure 3 — Generalized Slope Cross -Section A -A' <br />Figure 4 — Revised Stability Analyses, Trial 3 (2 pages) <br />Figure 4 — Stability Analyses - Southern Spoil slope <br />REFERENCES <br />Call & Nicholas, Inc. (CNI), 2005, Collom project, geotechnical study: Report prepared by Call <br />& Nicholas, Inc., for Kennecott Energy Company, August. <br />Colorado Mined Land Reclamation Board (CMLRB), 2005, Colorado Division of Minerals and <br />Geology (now Colorado Division of Reclamation Mining & Safety), "Regulations of the <br />Colorado Mined Land Reclamation Board for Coal Mining": Denver, Colorado <br />Shannon & Wilson, Inc., 2009, Geotechnical Study, Collom Temporary Spoil Fill, KCCC — <br />Colowyo Coal Company: Report prepared by Shannon & Wilson, Inc., Job No. 23-1- <br />01101-400, for KCCC — Colowyo Coal Company, July. <br />23-1-01403-002 <br />