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tl~oming Fudi Compon~ 12055 W. Second Place • P.O.Box 15596 • Lakewood.Coloratl~ /215 • Tele~h~ne (3~3)D~D-537 June 6, 1988 Ms. Sandy Marek Engineering Technician Colorado Department of Health 4210 East 11th Avenue Denver, Colorado 80220 ~~~ ~~-~ JUN y 1988 IvlfNcp LAf~',^, Re: Notification of Potential Upset Co nditi'~'n~L~+MHT101~1 Dlvfg(~N 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 condition 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 observed on the surface of Pond 802. WFC suspects this sh een could have resulted from the drilling fluids used in completing the above referenced wells. Drilling fluids may have entered the mine workings where they were subsequently pumped to Pond 002. WFC was and is not treating the mine water in anv capacity. In consequence of these observations, 47FC initiated a biomonitcring study on May 17, 1988. The results of this study were report e3 to :7.'C on or about Pray 20, 1968. Pond 002 effluent exhibited a 458 mortality at the 100£ concentration level for Ceriodaphn'_a. WFC was notified by the consulting laboratory that the Mav 17, 1988 study was not conducted according to current Colorado Depa~~ment of Health Standards. P.s such, the laboratory requested S~*FC resample so another biomonitoring study could be conducted. WFC r e-sampled Pond 002 effluent, Pond 002 influent and PRS-3 (PRS-3 is downstream from the mine water cischarge in th e Purgatoire River). The results of this stud}~ shoa•e3 mortality of Path ead minnows and Ceriodaphnia at the 1003 concentration level at the inlet and outlet of Pond 002. There was no significant 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.