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i~„ ~• r TRIAPP~RI NININGr INC. Apri124, 2006 CERTIFIED Ms. Cazla Lenkey Colorado Department of Public Health and Environment WQCD-PE-B2 4300 Cherry Creek Dr. South Denver, CO 80222-1530 FiECEG~/ED APR 21 2006 Division ~f Miaersls end Geola~y 'Subject; First Quarter 2006 Colorado Wastewater Discharge •Monitoring Reports , Permib No.. CO-0032115 Deaz Ms. Lenkey: Enclosed are Trapper Mine's First Quaver 2006 Colorado Wastewater Dischazge Monitoring Reports for the period Ol/1/06-03/31/06. During this quarter, ten NPDES outfalls were active. Outfalls 001, 002 and 020 discharged routinely throughout [he quarter. Ou[falls 005, 011, 013, 014, 015, 017, 021 discharged in response to spring snowmelt surges occurring is early March. Outfalls 008, 009, 012, 016, 018, 019, 023 and 024 did not discharge during [he quarter. Outfall 022 is associated with a sediment pond that has not yet been constructed. Values reported on the enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each ou[fall during the quarter. Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as applicable. Two outfalls were sampled for WET analyses during the quarter. Two species acute tests were completed a[ outfalls 020 and 021. No exceedances of WET test limitations were observed at any tested outfalls. No mine water was discharged through outfall 011 and 017; therefore no WET tests were conducted on these outfalls. All active outfalls experienced an intense spring runoff event starting February 26 and continuing until Mazch 7, 2006. During this period the site experienced continued daytime temperatures in excess of 40 degrees for several days. This wazm period combined with fair snow pack on the site and frozen soil conditions resulted in an intense snowmelt event. Also, 0.46 inches of precipitation fell the night of February 28, 2006 resulting in increased runoff. The enclosed NOAA weather summary reports show the temperatures and snow depth measurements for [he period mentioned. Daily precipitation measurements are recorded a[ 730 a.m. as well as daily maximum and minimum temperatures from the previous 24 hours. Primary effluent limitations were exceeded on seven outfalls, (001, 002, 005, 011, 014, 017, and 021,) for TSS and five, (001, 002, 005, 011, 017,) for Total Iron parameters. Outfall 020 remained in compliance throughout the quarter. The alternate limitations will be applied to outfalls 001, 002, 005, 011, 014, 017, and 021 due to the nature of the snowmelt event. For outfalls 013 and 015, only Settleable Solids standards must be met as TSS and Total Iron are waived; -Both of these outfalls remained in compliance. Samples were taken a[ each ou[fall on March 1, 2006 during routine weekly monitoring. The alternate limitations for Settleable Solids, applicable in the event of discharge caused by precipitation (or snowmelt) less than or equal to the 10-year, 24-hour precipitation even[, was met at all outfalls. No exceedances of primary effluent limitations for pH occurred during the quarter. P.O. Box 187- Craig, Colorado 81626 (970) 824-4401