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u TRAPPER 1CINING INC. I~ • III IIIIIIIIIIIII III RECEIVE® March 4, 1991 MAR 0 6 1991 CEIZTIFIED #PSG8141675 Ms. Sandi Marek Water Quality Control Division Colorado Dept. of Health 4210 East 11th Ave. Denver, CO 80220 Dear Sandi: Mined Land Reclamation Division Subject: NPDES Discharge Point 002 (No Name Drainage) Trapper Mine NPDES Fermit No. CO-0032115 As reported to you by telephone on March 1, 1991, Trapper Mine is submitting a non-compliance notification for TSS exceedance at NPDES discharge point 002 on ]/15/91. A TSS value of 96 mg/I was measured by ACZ Laboratories Inc. The high value was associated with an early snow melt and was caused primarily from the snow melting on pond sideslopes immediately adjacent to the principal spillway outlet and NPDES measuring device. Due to the premature nature of 1991's runoff, no settleable solids analysis was performed. I assure you all future TSS analysis taken during snow runoff periods that may be suspect will be accompanied by appropriate settleable solids measurements. Additional parameters measured during this runoff period (1115/91) included: flow: 220 gpm, pH: 8.0, SPCC: 2140, TSS: 1070, and Oil and Grease: no visible sheen. Altliorcgh the daily maximum concentration. for TSS was exceeded on 1/15/91, the 30- day average for the month of January, 1991, was not exceeded. The 30-day average was 33.0 mg/I (based on four samples). Laboratory results were received from A<:Z on 2/28/9] and due to my absence were not reviewed and reported until 3/1/91. As mentioned in our telephone conversation, I will continue to work with ACZ Laboratories and with Trapper personnel to ensure timely reporting of all water samples. Additionally Trapper will re-seed (broadcast) the sideslopes of No Name sedimentation pond SA immediately adjacent to the principal spillway and NPDES discharge point in an attempt to reduce the potential for excessive erosion within this area. P.0. Box 187 Craig, Colorado 81626 (303) 824-4401