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COAL <br />, �,�¢b <br />�COMPANY <br />♦A�DOLE.PRODo lol�1. <br />5731 State Highway 13 ♦ Meeker, Colorado 81641 • 970- 824 -1500 <br />January 4, 2013 <br />Mr. Rob Zuber <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P., Mine Permit C -81 -019, TR -98 West Taylor <br />Fill Revision <br />Dear Mr. Zuber, <br />On January 3 2013, Colowyo Coal Company L.P. received your email with the <br />following adequacy comment: <br />Do the FS numbers on the diagrams for the slope stability analyses have errors? <br />Figures 3 and 5 do not seem to match the FS numbers in Table 1. In Figure 3 it <br />appears that the FS number is 0.78, but in Table 1 it appears to be 1.4 (Case la). In <br />Figure 5 the FS is 0.85, but on Table 1 it is 1.4 (Case 2a). <br />Response: The errors the Division pointed out in the Shannon Wilson Addendum 4 <br />report are correct. On Figure 3 and Figure 5 the FS number has been revised to <br />1.42 accordingly. With those revisions to the report, Colowyo is resubmitting <br />Addendum 4 in its entirety. <br />Also included with this revision is a change of index to ease incorporation into the <br />permit document. If you should have any additional questions or concerns please <br />feel free to contact me at your convenience at (970) 824 -1532. <br />Sincerely, <br />Tony Tenn son <br />Senior Engineer - Environmental <br />Encl. <br />Cc: file CF 1.1.2.87 <br />Ircaer%, Fuels f,olorallo, LLC % %1131111` proprriy <br />RECEIVED <br />JAN 0 i2013 <br />Division of Reclamation, <br />Mining & Safety <br />