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Mr.Lucas J.West <br /> May 5,2025 <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 11 ft <br /> P6 4/30/2025 72.46 DRY N/A <br /> P7 4/30/2025 92.50 DRY N/A <br /> P8 4/30/2025 97.51 96.68 0.83 <br /> P9 4/30/2025 72.30 71.97 0.33 <br /> P10 4/30/2025 58.30 57.48 0.82 <br /> I'll 4/30/2025 41.80 41.4 0.4 <br /> P 12 4/30/2025 41.71 41.64 0.07 <br /> P13 4/30/2025 41.34 41.04 0.3 <br /> P14 4/30/2025 41.24 DRY N/A <br /> P15 4/30/2025 1 41.10 40.46 1 0.64 <br /> The leak detection system at the LTF Collection Pond was inspected April 30, 2025, and 960 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected April 30, <br /> 2025,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 April 2025, the West Pit Waste Water Treatment Plant(WWTP)was operated intermittently (3 <br /> to 4 days per week) under Colorado Department of Public Health and Environment (CDPHE) CDPS Permit No. <br /> C00045675 for discharge into the Rito Seco alluvial aquifer. During the month, 6,576,600 gallons (20.18 acre-feet) <br /> of treated water was discharged to the Rito Seco and 503,800 gallons (1.55 acre-feet) of water was transferred from <br /> the West Pit to the Lined Tailing Facility(LTF). Additionally,no water was reinfiltrated into the West Pit in April. <br /> BMRI performed the monthly visual seepage expression inspections on April 30, 2025, in the historic seepage area <br /> 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 4/30/2025 24.83 <br /> BF-511 4/30/2025 30.78 <br /> BF-6 4/30/2025 30.89 <br /> M-6 4/30/2025 DRY <br /> M-7 4/30/2025 DRY <br /> M-8 4/30/2025 DRY <br /> M-9 4/30/2025 104.99 <br /> M-10 4/30/2025 23.61 <br /> M-11R 4/30/2025 38.51 <br /> M-12 4/30/2025 174.16 <br /> M-13R 4/30/2025 125.57 <br /> M-14 4/30/2025 130.37 <br /> M-16 4/30/2025 22.66 <br /> M-17 4/30/2025 30.12 <br />