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• • iii iuiiiiiiiiu iii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Govei <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SNELTON, Director <br />July 13, 1987 <br />Mr. Rick Mills <br />Colorado Yampa Coal Company <br />29588 Routt County Road 27 <br />Oak Creek, Colorado 80467 <br />Dear Mr. Mills: <br />The Division has completed its review of the Annual Hydrologic Report <br />submitted for Mine No. 3. A copy of the review is enclosed. Analysis of <br />information presented in the report has resulted in the Division requesting <br />that the following changes in the monitoring program be implemented: <br />1) The detection limits for cadmium (ground water) and mercury (surface <br />water) are greater than the respective material damage criteria used by <br />the Division. CYCC is requested to improve its detection limit <br />capabilities for cadmium and mercury to concentrations equal to or less <br />than the appropriate material damage concentration. <br />2) CYCC is requested to generate a discharge rating curve that accurately <br />represents the flow at site 29. The current rating curve under-estimates <br />the discharge at this point. The new rating curve must be capable of <br />determining peak spring flows. CYCC is requested to submit the new <br />discharge rating curve and previous discharge rating curves to the <br />Division. <br />Feel free to contact me if you have any questions. <br />Sincerely, <br />'a~~ <br />~/ •~~ <br />Brent Anderson <br />Reclamation Specialist <br />BA/1 al <br />1005E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />