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iii iiiiiiiiiiiii iii 999 DEPARTMENT OF NATURAL RESOURCES David H. Getches, Executive Director MINED LAND RECLAMATION DIVISION DAVID C. SNELTO N, Director Richartl D. Lamm Governor April 2, 1986 Mr. Jim Stover Blue Ribbon Coal Company P.O. Box 1352 Palisade, Colorado 81526 Re: Blue Ribbon Mine Annual Hydrologic Report, File No. C-81-047 Dear Mr. Stover: We have completed our review of your 1985 Annual Hydrologic Report. The report was well organized and did a good job of interpreting the results of your monitoring data. We would like your interpretation of the problem of discharge of total iron. It appears to us that the iron is coming from the springs in the north end of the pond. What are the trends for iron concentration in discharge water for the past three years? What do you anticipate future trends to be. The pH of water discharging from the three underdrains installed in the mine bench was found to be acceptable. The average conductivity for the north and middle drains was slightly above suspect levels for irrigation use. The average conductivity of the south drain discharge was in excess of irrigation water suspect levels. In future reports we would like you to conduct a simple dilution analysis assuming a ten year low flow in Hubbard Creek of 1,6 cfs. This analysis should use average and worst case conductivity as well as quantity of discharge directly into Hubbard Creek. This type of an analysis would demonstrate post-miing conditions after removal of the sediment pond. It would also verify that no water quality standards are or will be violated. Please feel free to call if you have any questions. Sincerely, ~~~~ti ~~ t1'Y1ct~~~ ~,~ Susan Mowry Reclamation Specialist SM/pjh cc: Tom Schreiner 8971E 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567