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TRAPPER MININD INC. <br />July 21, 2008 <br />CERTIFIED <br />WCMW <br />Ms. Carla Lenkey JUL 2'8 2008 <br />Colorado Department of Public Health and Environment Uftbn Of R.W.M <br />WQCD-PE-132 ?d ti011, <br />4300 Cherry Creek Dr. South <br />Denver, CO 80222-1530 <br />Subject: Second Quarter 2008 Colorado Wastewater Discharge Monitoring Reports <br />Permit No. CO-0032115 <br />Dear Ms. Lenkey: <br />Enclosed are Trapper Mine's Second Quarter 2008 Colorado Wastewater Discharge Monitoring Reports for the <br />period 04/1/08-06/30/08. During this quarter, seven NPDES outfalls were active. Outfalls 001, 002 and 011 <br />discharged throughout the quarter. Outfall 013 discharged part of April and again in May due to precipitation <br />events in the form of snow and subsequent melting. Outfall 014 was recorded as flowing once due to snowmelt <br />in late winter. Outfall 020 discharged routinely through the quarter in response to rainfall, snowmelt, and <br />dewatering activities. Outfall 021 discharged due to snowmelt and pit pumping. Outfalls 005, 008, 009, 012, <br />015, 016, 017, 018, 019, 022, 023 and 024 did not discharge during the quarter. Values reported on the <br />enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each <br />outfall during the quarter. <br />Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as <br />applicable. Three outfalls were sampled for WET analyses during the quarter. Two species acute tests were <br />completed at outfalls 011, 020 and 021. No exceedances of WET test limitations were observed at any tested <br />outfalls. <br />Primary effluent limitations were exceeded at two outfalls during the quarter. These exceedances were in direct <br />response to snowmelt and or precipitation events resulting in snowfall on the site. Due to the nature of melting <br />snow, the runoff can vary quite a bit from one watershed to the next. Samples taken April 15, 2008 showed an <br />exceedance of TSS at outfall 014 due to winter snow pack melting. Samples taken May 6, 2008 showed an <br />exceedance of TSS at outfall 002. This exceedance followed a warm weekend and an intense spring snowstorm <br />on May V and 2'. The alternate limitations for Settleable Solids, applicable in the event of discharge caused by <br />precipitation (or snowmelt) less than or equal to the 10-year, 24-hour precipitation event, was met at all outfalls. <br />No exceedances of primary effluent limitations for pH occurred during the quarter. <br />Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. All outfalls have <br />been properly maintained and no ponds exceeded the 60% threshold for sediment accumulation. All structures <br />operated properly and were not compromised in any way. The exceedances occurred solely in response to <br />discharge caused by precipitation and/or snowmelt, therefore the alternative limitations are applicable for this <br />event. All other operations were properly conducted concerning the sediment control structures at Trapper <br />Mine. <br />P.O. Box 187 <br />Craig. Colorado 81626 <br />(970) 824-4401