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:~ iiiiiiiiiiiniaiii STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1 } 13 Sherman St., Room 215 Denver, Colorado 80203 Vhone: 1303)866-3567 rA%: (303) 832-8106 December 20, 1994 Mr. Mark Kerr, President Landmark Reclamation, Inc. 4901 South Windermere Street Littleton, CO 80120 I~~~ DEPARTMEM OF NATURAL RESOURCES Roy Romer Governor lames 5. lochhead Executive Dveaor Michael B. long Drvrswn Direcmr RE: Sediment Pond, Rimrock Coal Company, Rimrock Strip Mine, Permit No. C-89-074. Dear Mr. Kerr: The purpose of this letter is to discuss three compliance issues for the sediment pond at the Rimrock Strip Mine. 1. Rules 4.05.6(11)(8) and 4.05.9(8) require that pond embankments be vegetated or stabilized by other means. I reviewed the DMG inspection reports for 1994, and found comments documenting the lack of vegetation on the pond embankment for reports dated 1/11/94, 2/9/94,5/25/94,7/19/94, 9/29/94, 10/25/94, and 12/7/94. In the 9/29/94 report, the Division requested that the embankment be reseeded with mulch and net applied during the 1994 fall seeding season. Please submit by January 20, 1995 written statement describing revegetation efforts taken for the embankment and also state how Landmark Reclamation intends to comply with 4.05.6(11)(8) and 4.05.9(8). 4.05.9(8) Faces of embankments and the surrounding areas shall be vegetated or stabilized by other means. Where water will be impounded, the active, upstream face of the embattkntent shall be riprapped or otherwise stabilized, in accordance with accepted design practices if necessary to protect against erosion from water or wind action or sudden drawdown. Adequa[e freeboard shall be designed and maintained to prevent overtopping by waves or by sudden increases in volume. /f the chosen stabilization method is vegetation, seeding will occur in accordance with the approved seeding plan. 4.05.6(11)(8) Faces of embankments including the surrounding areas disturbed by construction shall be vegetated or stabilized by other means. The active upstream face of tl:e embankment I+~here water is being impounded may be riprapped or otherwise stabilized in accordance with accepted design practices If the chosen stabilized in accordance with accepted design practices. /f the chosen stabilization method is vegetation, seeding will occur per the approved seeding schedule.