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r <br />TRAPPER MINING INC. <br />P.O. Box 187 Craig, Colorado 81626 <br />January 12, 2018 <br />Colorado Department of Public Health and Environment <br />WQCD-PE-B2 <br />4300 Cherry Creek Dr. South <br />Denver, CO 80222-1530 <br />Subject: Fourth Quarter 2017 Colorado Wastewater Discharge Monitoring Reports <br />Permit No. CO -0032115 <br />To whom it may concern: <br />(970)824-4401 <br />Enclosed are Trapper Mine's Fourth Quarter 2017 Colorado Wastewater Discharge Monitoring Reports for the <br />period 10/1/17-12/31/17. During this quarter, five NPDES outfalls were active. Outfalls 001, 002, 011 and 020 <br />discharged routinely throughout the quarter. Outfall 022 discharged in early October in response to heavy rainfall <br />events. Outfalls 008, 009, 017, 018, 019, 021, 023 and 024 did not discharge during the quarter. Values reported on <br />the enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each <br />outfall during the quarter. <br />The TDS is reportable on a quarterly basis per the permit. The TDS values are as follows for each active outfall: <br />001 <br />002 <br />011 <br />020 <br />022 <br />3110 mg/L <br />1580 mg/L <br />1720 mg/L <br />1250 mg/L <br />332 mg/L <br />Primary effluent limitations were exceeded at two outfalls during the quarter. These exceedances were in direct <br />response to precipitation events occurring at the site. Samples taken October 3, 2017 showed an exceedance of TSS <br />and Total Iron at outfall 020 due to rainfall runoff. The values were 271 mg/L and 3790 ug/L respectively. An <br />exceedance of the flow limits was recorded at outfall 022. An intense, short duration thunderstorm event occurred <br />Thursday, September 28th, followed by further heavy rains throughout the following weekend. Precipitation totals for <br />the thunderstorm event were recorded at 1.16 inches and further precipitation was recorded for the weekend at 1.88 <br />inches with an additional 0.38 inches falling Monday, October 2nd immediately prior to sampling. Outfall 020 lies <br />below the most active mining area on the site and receives runoff from numerous acres of disturbed land and roadways. <br />No mine water was discharged with this event, only surface runoff. The alternate limitations for Settleable Solids, <br />applicable in the event of discharge caused by precipitation (or snowmelt) less than or equal to the 10 -year, 24-hour <br />precipitation event, was met at all outfalls. No exceedances of primary effluent limitations for pH occurred during <br />the quarter. <br />Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as <br />applicable. <br />Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. All outfalls have been <br />properly maintained and no ponds exceeded the 60% threshold for sediment accumulation. All structures operated <br />properly and were not compromised in any way. All other operations were properly conducted concerning the <br />sediment control structures at Trapper Mine. <br />Please contact me if you have any questions regarding the enclosed information, 970-826-6143 <br />Sincerely, <br />ELECTRONICALLY SUBMITTED AND SIGNED THROUGH NetDMR <br />RECEIVED <br />FEB 08 2018 <br />DIVISION OF RECLAMATION, <br />MINING AND SAFETY <br />