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(TRAP MINE <br />61 <br />CERTIFIED <br />Colorado Department of Public Health and Environment <br />WQCD -PE -B2 <br />4300 Cherry Creek Dr. South <br />Denver, CO 80222 -1530 <br />To whom it may concern: <br />Sincerely, <br />/ d / L__ <br />Graham Roberts <br />EHS Specialist <br />GCR [ W ATER/DMR'Quarterly Letter /2nd Quarter 2012] <br />Enclosure <br />c Jared Ebert, CDRMS <br />File 109.2.7 <br />P.O. Box 187 <br />TRAPPER MINING INC. <br />July 23, 2012 <br />Subject: Second Quarter 2012 Colorado Wastewater Discharge Monitoring Reports <br />Permit No. CO- 0032115 <br />Craig, Colorado 81626 (970) 824 -4401 <br />RECEIVip <br />JUL 3 0 ?112 <br />Divisio o f,eciamation, <br />Mining and Safety <br />Enclosed are Trapper Mine's Second Quarter 2012 Colorado Wastewater Discharge Monitoring Reports for the <br />period 04/1/12 - 06/30/12. During this quarter, four NPDES outfalls were active. Outfalls 001, 002, 011 and 020 <br />discharged throughout the quarter. Outfalls 005, 008, 009, 012, 013, 014, 015, 016, 017, 018, 019, 021, 022, 023 <br />and 024 did not discharge during the quarter. Trapper Mine and Northwest Colorado in general experienced an <br />extremely dry winter. Primary spring runoff had already occurred on the site during first quarter this year. Values <br />reported on the enclosed DMRs represent the maximum (or minimum as applicable) monthly /daily values generated <br />at each outfall during the quarter. <br />Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as <br />applicable. Two outfalls were sampled for WET analyses during the quarter. Two species acute tests were <br />completed at outfall 011 and 020. No exceedances of WET test limitations were observed at any tested outfalls. <br />No exceedances of primary effluent limitations occurred during this quarter. <br />Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. Outfalls 001, <br />structures #7R, #8, #10; 002, structure #5; 013, structure #1 and 017, structure #1 has exceeded 60% sediment <br />levels. These structures will be cleaned by the end of the calendar year. All other outfalls have been properly <br />maintained and did not exceed the 60% threshold for sediment accumulation. All structures operated properly and <br />were not compromised in any way. All other operations were properly conducted concerning the sediment control <br />structures at Trapper Mine. <br />Thank you for your cooperation in this matter. Please contact me if you have any further questions or comments <br />concerning the enclosed information. <br />