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c c III IIIIIIIIIIIIIIII ~~~ UU>y~m9ng duel Com~n~ 12055 W. Second Place • P.O. Box 15596 Lakewood. Colorado 80215 Telephone (303) 989-5037 October 30, 1986 ~ ~~~~~~ Colorado Department of Health Water Quality Control Division Permits and Enforcement Section 4210 East 11th Avenue Denver, Colorado 80220 Gentlemen: MAR 2 3 1987 WQCD, PERMIT SECTION Wyoming Fuel Company (WFC) exceeded permit TSS and Iron effluent limits during the third quarter 1986 at discharge point 007A. This discharge point is a sedimentation pond controlling runoff fran the New Elk Mine. Total precipitation was 5.2 inches for the third quarter. The third quarter was highlighted by storm events averaging .75 inches per week. On August 19, 1986 WFC canpleted a survey of Pond 007A. This survey was completed as per Colorado Mined Land Reclamation regulations. This annual survey is completed to determine sediment levels and pond capacity. The pond capacity is within 0.1 acre-foot of approved design capacity. The pond should be handling sediment loading. It is not. WFC will be taking the following measures pending Department approval to correct effluent problems. 1. . Pond 007A will be drained. Draining the pond is necessary to canplete the tasks outlined below. By this correspondence, WFC is notifying the Department of a known bypass situation. To canpletely drain the pond, WFC must divert the present drainage around Pond 007A and pump residual water. The bypass will be in effect for a time period to allow drying of sediment and complete prooosed modifications. WFC understands our discharge permit requires a 10-day notification period prior to beginning a bypass. 2. Since the pond meets current design requirements, !~1cC does not want *_o modify the existing structure. WFC is proposing to install a settling structure at the point of pond influent. This settling structure will decrease flow velocity and increase settling time. Pond 007A capacity will not be reduced, nor will the structure be built to allow short circuiting of runoff during design events. 3. WFC will be installing a series of rock check dams in the ditch draining the disturbed area to further decrease velocity. The ditch will be enlarged, if necessary, to handle peak flows after t)1e check dams are in place. 4. Flocculant logs may be placed at the inlet to Pond 007A to increase settling of suspended solids.