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//~, Kennecott <br />~ ,~ Energy <br />Colowyo Coal Mine <br />5731 State Highway 73 <br />Meeker, Colorado 81641 <br />Telephone: (970j &24-1579 <br />Fax'. (970) 824-1598 <br />Tay Tonoul <br />Sr. Environmental Engineer <br />Mazch 21, 2006 <br />Mr. Jim Stark <br />Environmental Protection Specialist <br />Colorado Division of Minerals & Geology <br />1313 Sherman Street-Room 215 <br />Denver, Colorado 80203 <br />RECEIV~~J <br />MAR 2 3 2006 <br />DIYInDn of Minerals and G~rofc7Y <br />RE: Technical Revision No. 62, Change in Topsoil Replacement Depth Colowyo Coal <br />Mine, Permit No. C-81-019. <br />Deaz Mr. Stark, <br />As we have discussed, enclosed please find three copies each of materia]s prepared in response to <br />your Technical Adequacy Comments for the above referenced change. <br />During the preparation of these materials, we noted an error in the prior submittal of Table 2.05-1. <br />This has been corrected with this submittal, with the resulting average replacement depth <br />recalculated at just over 9 inches. Because this value is expected to vary slightly, the text for the <br />average replacement depth has been left at 8 inches. <br />Also included is a revised page from the 2004 Annual Reclamation Report. The 2005 Annual <br />Reclamation Report, to be submitted later next week, will contain a "Section 12" which describes <br />the topsoil volumes in stockpile and provides topsoil replacement depths and estimated quantities <br />for each reclamation polygon. These annual data will facilitate any updates to Table 2.05-1 in the <br />future. <br />Also note that this package includes aledger-sized Figure 1 "Topsoil Mapping" diagram that is <br />provided for informational purposes only and is not part of the formal submittal. If you have any <br />questions or just require additional information, please don't hesitate in contacting me at the <br />phone number above. <br />Sincerely, <br />aT y'1'onL <br />Sr. Environmental ~ er <br />Encl. 3 copies <br />Cc: file CF 1.1.2.51 2006 w\encl <br />Public Permit wiencl <br />Antelope Mine • Colowyo Mine • Cordero Rojo Mine • Jacobs Ranch Mine • Spring Creek Mine <br />member of the Rio Tinto Gxoup <br />