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iiininiiiniuiii 999 Wyoming Fudl Compon~ 12055 W. Second Place • P.O. Box 15596 • Lakewood, Golorad~ t/215 • Tele~n~ne (3/3) Dt9-s/37 June 6, 1988 Ms. Sandy Marek Engineering Technician Colorado Department of Health 4210 East 11th Avenue Denver, Colorado 80220 JUiJ 91988 _ IYIINc'p Lt,P~~ Re: Notification of Potential Upset Condit~n~L'4MHTIOh~ DIVIS1pN Wyoming Fuel Company (WFC), Golden Eagle Mine, Permit No. CO-0033367 Dear Ms. Marek: Per our telephone conversation of June 6, 1988 this letter serves as notification of a potential upset cenditicn at the Golden Eagle Mine near Weston, Colorado. WFC has been installing test wells to further characterize the water inflow int• mine workings and reduce methane gas levels. Four wells were completed between April 5, 1988 and May 5, 1988. On May 12, 1988, a visible sheen was obse_~ved on the surface of Pond 002. WFC suspects this sheen could have resulted from the drilling fluids used in completing the above re>ferenced wells. Drilling fluids may have entered the mine workings wh ere th ey were subsequently pumped to Pond 002. WFC was and is not treating the mine water in any capacity- In consecuence of these observations, Y7FC initiated a biomonitcring study on May 17, 1988. The results of this study were report e3 to :,rC on or about Play 20, 1988. Pond 002 effluent eahibit~ a 45~ mortality at the 103% concentration .level for Ceriodaphnia. WFC was notified by the consulting laboratory that the May 17, 1988 study was not conducted accordinc Lp current Colorado Department of Health Standards. As such, the laboratory requested k*FC resample so another biomonitoring study could be conducted. WFC re-sampled Pond 002 effluent, Pond 002 influent and PRS-3 (PRS-3 is downstream from the mine water cischarcae in the Purgatoire River). The results of this stud}~ showed mortality cf fathead minnows and Ceriodaphnia at the 1000 concentration level at the inlet and outlet of Pond 002. There was no sicnificant mortality at any of the lower concentrations. There was no significant mortality in the river downstream from the mine water discharge at any concentration level. ,.