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Tonya Hammond <br /> Page 2 of 2 <br /> 3/24/2020 <br /> Data recorded from the discharge outfall 016 recorded a total of 566 tons of Total <br /> Dissolved Solids discharged from 016 in the 2019 water year. The total TDS calculated <br /> for the Colorado River below the mine was 1.39 million tons for 2019. The TDS from <br /> the mine equaled 0.041% of the total TDS in the Colorado River. <br /> The gauge located within Outfall 016 was replaced in mid-2019. The gauge was replaced <br /> during a CDOT project to replace a culvert underneath Interstate 70. The gauge was <br /> reporting incorrect values for flow prior to the reinstallation of the gauge. Flows after the <br /> replacement averaged 117.65 gpm. The average and individual measurements are similar <br /> to that of bucket and stopwatch estimates conducted in the past. <br /> The N-1 Monitoring well is located at the North Decline. The water in the well is <br /> predicted to remain near an elevation of 4,758 feet above sea level. The average <br /> elevation from data recorded in the 2019 water year was 4,757.64 feet above sea level <br /> and the highest elevation for the year was 4,758.09 feet above sea level. The recorded <br /> levels for the year were near the predicted level. <br /> This concludes the Division's review of the 2019 Annual Hydrology Report for the <br /> Roadside Portals Mine. The Division has no further comments or questions. If you have <br /> any questions,please contact me at(303) 866-3567 x8144. <br /> Sincerely, <br /> Nj� <br /> Clayton Wein <br /> Environmental Protection Specialist <br /> clayton.wein@state.co.us <br />