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-- ~II'I~~I~'I~~~~~~I sss -~~~~~ STATE OF COLORADO Roy Romer, Governor ~ - ~~ DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION DAVID C. SHELTON, Director May 4, 1987 Mr. Rick Mills Colorado Yampa Coal Company 29588 Routt County Road No. 27 Oak Creek, Colorado 80467 RE: Eckman Park Post-Mining Topography and Channel Stabilization Permit Revision (PR-2 ), File No. C-81-071 Dear Mr. Mills: The Division has reviewed CYCC's adeouacy response submittal of April 14, 1987. Overall, the plan represents significant improvement over the existing topography with respect to geomorphic stability and achievement of approximate original contour (AOC). It is apparent that distinct differences still exist between CYCC's and the Division's interpretation of AOC, but it appears that a satisfactory resolution will be achieved, despite those philosophical differences. We do have several remaining technical concerns, which are detailed below. 1. We have a number of concerns with regard to the revised Eckman Park Post-mining Topography Map (Map 48-A). a. Temporary structures such as topsoil piles, roads and diversions should not be depicted on the post-mine map. Roads that will be retained should be depicted in their post-mining condition. b.' Channel 31-3 is not shown as continuing through the newly proposed post-mining topography to its confluence with the Area 7 drainage. A channel in eastern Area 9/10 is also shown as ending abruptly, when in actuality it is tributary to the major drainage in that area. These channel reaches should be depicted. c. In our letter of March 5, 1987, we reouested that the need for stabilization of drainage 9/10-3 be addressed. The response was that "Drainage 9/10-3 does not appear on the new mapping." Indeed, it does not now appear on the map and we request some clarification. Does a channel exist on the ground? If not, why \ 423 Centennial Building, 1313 Sherman Street Denver I r Coo ado 80203-2273 Tel. (303) 866.3567