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Mr. Lucas J. West <br /> October 3,2024 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date (ft) (ft) (ft) <br /> P6 9/30/2024 72.46 DRY N/A <br /> P7 9/30/2024 92.50 DRY N/A <br /> P8 9/30/2024 97.51 96.71 0.80 <br /> P9 9/30/2024 72.30 71.98 0.32 <br /> P10 9/30/2024 58.30 57.46 0.84 <br /> P11 9/30/2024 41.80 41.42 0.38 <br /> P12 9/30/2024 41.71 41.65 0.06 <br /> P13 9/30/2024 41.34 41.03 0.31 <br /> P14 9/30/2024 41.24 DRY N/A <br /> P15 9/30/2024 41.10 40.84 0.26 <br /> The leak detection system at the LTF Collection Pond was inspected September 30, 2024, and 850 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected <br /> September 30,2024, and the flow rate was measured to be approximately 28.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of September 2024, the West Pit Waste Water Treatment Plant (WWTP) was operated <br /> intermittently(3 to 4 days per week)under Colorado Department of Public Health and Environment(CDPHE) CDPS <br /> Permit No. C00045675 for discharge into the Rito Seco alluvial aquifer. During the month, 5,861,600 gallons <br /> (17.99 acre-feet) of treated water was discharged to the Rito Seco and 451,800 gallons (1.39 acre-feet) of water was <br /> transferred from the West Pit to the Lined Tailing Facility (LTF). Additionally, no water was reinfiltrated into the <br /> West Pit in September. <br /> BMRI performed the monthly visual seepage expression inspections on September 30, 2024, in the historic seepage <br /> area identified in Figure 2 of the permit. No seepage expressions were observed in the historic seepage area. <br /> BMRI measured the monthly West Pit backfill, alluvial and monitoring wells as required under the QA/QC Plan. <br /> Measurements obtained for the monthly wells are shown in Table 3. <br /> Table 3-Monthly and Quarterly Groundwater Depth to Water <br /> Monitoring Well Identification Observation Date Depth to Water <br /> (ft) <br /> BF-4 9/30/2024 24.75 <br /> • <br /> BF-5R 9/30/2024 30.72 <br /> BF-6 9/30/2024 30.78 <br /> M-6 9/30/2024 DRY <br /> M-7 9/30/2024 DRY <br /> M-8 9/30/2024 DRY <br /> M-9 9/30/2024 141.2 <br /> M-10 9/30/2024 24.11 <br /> M-11R 9/30/2024 39.17 <br /> M-12 9/30/2024 174.29 <br /> M-13R 9/30/2024 125.61 <br /> M-14 9/30/2024 130.45 <br /> M-16 9/30/2024 23.16 <br /> M-17 9/30/2024 30.21 <br />