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T iii iiuiiiiiiiii iii 1~~~ 5731 State Highway 13 +OAL ~ Q Meeker, Colorado 81641 COMPANY o (303) 824-4451 September 14, 1993 Ms. Janet Binns RFCF_!~'EG Reclamation Specialist Colorado Division of Minerals and Geology SEP 1?1993 215 Centennial Building 1313 Sherman Street Denver, Colorado 80203 ~i!~i~:c.^. c~ !.~ ~~~:r~~: ~ iaeciogy RE: Permit C-81-019 Colowyo Coal Company Technical Revision No. 23, Interim Topography Response to DMG letter dated September 3, 1993 Dear Ms. Binns: The purpose of this letter is to provide a response to the Division's concerns raised in your September 3, 1993 correspondence. At the Division's recommendation, Colowyo will blend the "ridgeline" by a combination of the following. 1) The upper reaches of the Swale contours (7775.0, 7750.0 elevation) will be shifted to the northeast to reduce the extent of the Swale. 2) The lower Swale contours (7725.0, 7700.0 and 7675.0 elevation) will be changed to widen the Swale and make it less pronounced and 3) the top of the "ridgeline" will be flattened to make it less pronounced. Effectively, the "ridgeline" will now be eliminated above the 7750' contour elevation. It is not our intention that these interim contours be approved as final postmininq topography. Should it become necessary to leave all or a portion of these interim contours as final topography due to an unforeseen change in the final east pit configuration, this issue will be addressed at some future date as part of an overall Technical Revision for the East Pit. At this time we do not anticipate this scenario, but the possibility exists. Should a Technical Revision be necessary, it will, of course, also involve a reconfiguration of the East Pit Ditch, etc. To address possible changes to the East Pit Ditch now and its relationship to the interim topography would be a pointless exercise.