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Richard D. Lamm Governor iiiiin~~iin~uiii DEPARTMENT OF NATURAL RESOURCES David H. Getches. Executive Director MINED LAND RECLAMATION D11 DAVID C. SHELTO N, Director DATE: May 15, 1986 T0: Jeff Deckler FROM: Jim Pendl~t6 RE: -' ~~.-. HAUL ROAD SLOPE STABILITY (PERMIT N0. C-81-029) Following up on the recent request by Sun Coal Company for bond release for their haul road at the Meadows Mine, I visited the mine site on Friday, May 9th. I joined you, Mike Long and Brian Archer at the mine sight. Mr. Archer, mine manager for Sun Coal Company, presented me with a map and cover letter report prepared by the operator's consultant, Mr. Ray Platt of Intrasearch, Inc. Intrasearch, Inc., completed an aerial photogrammetric analysis of slope stability at the Meadows Mine and adjoining area. Mr. Platt, whose work I atr familiar with, produced a map delineating several significant areas of pre-1938 ("historic") landsliding, modern landslide areas, and potentially unstable slope areas at the mine site. While his letter report is very brief his analysis portrays that no significant areas of active landsliding currently threaten the road. The areas which were previously potentially unstable have not been exacerbated by the road construction and mining activity at the Meadows Mine during the past eight years. Mr. Platt also indicated areas of minor active landsliding. Our visit to the mine site and inspection of the areas adjoining the haul road disturbance determined that one small slide had occurred since the latest photography utilized by Mr. Platt, which was obtained October 16, 1985. According to my examination of the mine site during our May 9, 1986 inspection tour, seven small areas of surficial slope instability exist within the permanent area adjoining the haul road. These areas will require remedial treatment prior to bond release. The new small embankment failure is located above the road, in the vicinity Culvert No. 2. Several surficial slump areas exist in the cut slope above the road and one slump area in the embankment below the road in the vicinity of Culvert No. 7. Similarly, near Culvert 10, several small slumps exist within the cut slope above the road and one area of slope instability below the road. These areas of cut slope and fill embankment instability will require stabilization prior to bond release. The operator should prepare and submit specific engineered plans for remedial treatment of these slumps. The operator should also submit a proposed schedule for affecting these required repairs. /dlm cc: Mike Long 0211 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567