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c~RUs Orchard Valley Cyprus Orchard Valley Mine P. O. Box 1299 Paonia, CO 81428 P hone: 303-527-4135 Fax: 303-527-223a October 31, 1990 Ms. Susan McCannon, Reclamation Specialist Colorado Mined Land Reclamation Division 215 Centennial Building 1313 Sherman Street Denver, Colorado 80203 RE: NOTICE OF DISCHARGE EXCEEDING N.P.D.E.S. PARAMETERS (DISCHARGE POINTS 001. 0051 Dear Ms. McCannon, Attached, please find the discharge monitoring reports (DNB's) for point 001 through 006 for the period of July 1, 1990 through September 30, 1990. The DMR's indicate that an exceedance occurred at point 001 during this period. The specifics of the exceedance will be discussed below. POINT 001 - the monthly average for fecal coliforms is reported at 6,250/100 ml, and the permit requires 2,000/100 ml. This number is reflective of the number of coliforms reported during the July sampling. The reported results for this quarter are as follows: July - 18,750/100 ml, August and September - 0/100 ml. This resulted from the break down of the chlorinator injector unit. Thus, not enough chlorine was being metered into the effluent water. ACTION TAKEN Chlorine was hand fed into the effluent water, until replacement parts could be obtained to correct the feed problem of the chlorinator. The chlorinator has been repaired and is functioning properly. ADDITIONAL INFORMATION The effluent discharge from the plant goes directly to a holding pond, and no discharge occurred from the pond which would enter State waters. POINT 005 - On September 18, 1990, a severe rain storm occurred in the are, and as a result of the storm, the dam embankment breached. It was planned to obtain a sample of the effluent resulting from this storm but the breached embankment did not allow for this.