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P_y PEABODY C01L COMPANY Roeky Mountain Dhlslon October 7, 1985 Ms. Anne Baldrige Geologist/Hydrologist Mined Land Reclamation Division (MLRD) 423 Centennial Building 1313 Sherman Street Denver, CO 80203 Dear Anne: RE: SENECA II MINE - NOV NO. C-85-081 10375 East Harvard Avenue su~ie aoo Denver. Colorado B023t (303) 337-5903 In reference to the above NOV, a number of abatement procedures have been prescribed. The first step necessary to abate this viola- tion is "to establish and implement a method for periodic monitoring of sediment levels". The deadline for implementation of this first step is October 10, 1985. At the present time a sediment pond survey is being conducted on Ponds 003 (shop area pond) and 004 (southern mining area) to determine present sediment levels in these two ponds. Pond 002 (Wadge impoundment), with its 300 acre-feet capacity, is currently bein evaluated to determine if storage volume is adequate to st°` the 10-year 24-hour storm event as well as necessary sediment storage. Based on the information for Pond 002, and in consultation with MLRD, a determination will be made as to whether the 002 pond will have to be surveyed for sediment volume. The pond surveys will be completed by October 10, 1985. The sediment volume calculations will be submitted as soon as possible thereafter. The information from the surveys and the sediment volume calculations will provide the basis for addressing abatement steps 2, 3 and 4 by the November 15, 1985 deadline. The sampling methodologies (which will provide the basis for the ongoing periodic monitoring) will be detailed in the submittal containing the sediment volume calculations. Additionally, the sediment volume calculations will be compared to the age of the sediment ponds to determine the rate of sedimentation. This will allow for development of realistic sediment pond clean-out schedules. REt:E1~V~~ OCT• 919b~ Y~~ III IIIIIIIIIIIII III F~ ~. MINED IANp RECLAMATION DIVISION