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TRAPPER MINING INC. July Z5, 2002 CERTIFIED 117099 3220 0003 0832 0646 RECEIVED Ms. Carla Lenkey 1JUL 31 2002 Colorado Deparunent of Public Health and Environment WQCD-PE-B2 1)IVision of Minerals & Geology 4300 Cherry Creek Dr. South Denver, CO 80222-1530 'Subject: Secoud Quarter 2002 Colorado Wastewater Discharge Monitoring Reports, Permit No, Cl)-0032115 - _ ,__ _ _ _ ._ . Deaz Ms. Lenkey: Enclosed are Trapper Mine's Second Quarter 2002 Colorado Wastewater Dischazge Monitoring Reports for the period 04/01/02 - 06/30/02. During this quarter, five NPDES outfalls were active. Outfall 001 discharged routinely through May and outfa11002 discharged routinely throughout the quarter. Outfalls 011 and 020 dischazged briefly early in the quarter in response to snowmel[ runofi". Outfa11021 discharged during May and June as a result of manual dewatering activities. Outfalls 003, 005, 006, 008, 009, 010, 012, 013, 014, 015, 016, 017, 018, 019, and 023 did not discharge during the quarter. Outfalls 022 and 024 are associated with sediment ponds that have not yet been constructed. No discharges are reported for these outfalls. Values reported on the enclosed DMRs represent the maximum (or tninimum as applicable) monthly/daily values generated at each outfall during the quarter. Also enclosed is monthly NOAA weather suaunaries for the reporting period, seep volume data for site 011, and WET test report forms as applicable. Four outfalls were sampled for WET analyses during the quarter. Two species acute tests were completed at outfalls 001, 011 and 021 doting the second quarter. A single species acute test (P. promelas) was completed at outfall 002 during the fast quarter. Results for the outfa11002 WET are formally reported with this quarter's DMR submittal as the applicable reporting period for this test at this outfall continues through June. No exceedences of WET test ]imitations were observed at any tested outfalls during the applicable reporting periods. Two exceedences of primary effluent limitation occurred daring the quarter, however, the alternate limitations were applicable in these cases as the exceedences were solely attributable to runoff stemming from a precipitation/snowmelt event and the sediment ponds discharging to the outfall were being properly maintained and operated. At outfall 01 I, the primary thirty-day average limitations for TSS and Total Iron were exceeded by a sample collected at 9:20 a.m on 04/02/02 (46 mg/1 TSS and 3.14 mg/1 TOTFE). The alternate daily maximum limitation for settleable solids, applicable in the event of dischazge caused by precipitation (or snowtnelt) less than or equal to the 10-year, 24-hour precipitation event, was met. As indicated by the temperature record on the enclosed monthly NOAA weather summary for April, during this time period, snowmelt was occurring. The last week of Mazch was the beginning of a warming trend that culminated with a high of 67 degees recorded on 04/02/02. Daily weather observations are recorded at 7:00 a.m The sample from outfa11011 was collected at 920 a,m. on 04/02/02. The previous days high had been b7 degrees and as [toted in the NOAA weather summaries the temperature was dipping well below freezing each night. No precipitation was recorded during this period. This demonstrates that [he severe temperature differential occurring and the resulting snowmeh event experienced during sampling were the sole cause of the exceedences. This information also demonstrates this dischazge was sampled within 48 hours of the snowmelt event. P.O. Box 187 Craig, Colorado 81626 (970) 824-4401