Laserfiche WebLink
dt <br /> TRAPPER MINING INC. <br /> P.O.Box 187 Craig,Colorado 81626 (970)824-4401 <br /> July 22, 2019 <br /> RECEIVED <br /> Colorado Department of Public Health and Environment Auppg2019 <br /> Water Quality Control Division OF RECLWATiON <br /> WQCD-P-132 DIN WD SAF <br /> 4300 Cherry Creek Dr. South <br /> Denver, CO 80246-1530 <br /> Subject: Second Quarter 2019 Colorado Wastewater Discharge Monitoring Reports <br /> Permit No. CO-0032115 <br /> To Whom It May Concern: <br /> Enclosed are Trapper Mine's Second Quarter 2018 Colorado Wastewater Discharge Monitoring Reports for the <br /> period 04/1/19-06/30/19. During this quarter, four NPDES outfalls were active. Outfalls 001, 002 and 011 <br /> discharged routinely throughout the quarter. Outfall 020 discharged in response to spring snowmelt occurring in <br /> early April. Outfalls 008, 009, 017, 018, 019, 021, 022, 023 and 024 did not discharge during the quarter. <br /> Values reported on the enclosed DMRs represent the maximum (or minimum as applicable)monthly/daily values <br /> generated at each outfall during the quarter. <br /> The TDS is reportable on a quarterly basis per our permit. The TDS values are as follows for each active outfall: <br /> 001 002 011 020 <br /> 2590 mg/L 716 mg/L 832 mg/L 750 mg/L <br /> Also enclosed are monthly NOAA weather summaries for the reporting period. The enclosed NOAA weather <br /> summary reports show the temperatures and precipitation measurements for the period mentioned. Daily <br /> precipitation measurements are recorded at 7:00 a.m. as well as daily maximum and minimum temperatures from <br /> the previous 24 hours. <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 melting snowpack on the site. Samples taken April <br /> 9, 2019 showed an exceedance of TSS and total iron at outfalls 011 and 020 due to warming weather and <br /> significant lingering snowpack melt. Temperatures steadily increased over the first week of April. Prior to this <br /> period the area had been unseasonably cool and still receiving snowfall events. Lingering significant snowpack <br /> covered a great deal of the area and began to rapidly melt during early April with high temperatures in the 50's <br /> and 60's. Attached photos of the mine site show the decrease in snow coverage for the site as melting was <br /> occurring. 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. <br />