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Mr.Lucas J.West <br /> September 4,2025 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well t Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Dae ft ft ft <br /> P6 8/28/2025 72.46 DRY N/A <br /> P7 8/28/2025 92.50 DRY N/A <br /> P8 8/28/2025 97.51 96.71 0.80 <br /> P9 8/28/2025 72.30 71.96 0.34 <br /> P10 8/28/2025 58.30 57.48 0.82 <br /> I'll. 8/28/2025 41.80 41.42 0.38 <br /> P12 8/28/2025 41.71 41.66 0.05 <br /> P13 8/28/2025 41.34 41.02 0.32 <br /> P14 8/28/2025 41.24 DRY N/A <br /> P15 1 8/28/2025 1 41.10 1 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected August 28, 2025, and 960 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected August 28, <br /> 2025,and the flow rate was measured to be approximately 25 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of August 2025, the West Pit Waste Water Treatment Plant (WWTP) was operated intermittently <br /> (3 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, 6,182,200 gallons (18.97 acre-feet) <br /> of treated water was discharged to the Rito Seco and 426,000 gallons (1.31 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 August. <br /> BMRI performed the monthly visual seepage expression inspections on August 28, 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 8/28/2025 24.83 <br /> BF-5R 8/28/2025 30.78 <br /> BF-6 8/28/2025 30.89 <br /> M-6 8/28/2025 DRY <br /> M-7 8/28/2025 DRY <br /> M-8 8/28/2025 DRY <br /> M-9 8/28/2025 141.06 <br /> M-10 8/28/2025 24.16 <br /> M-11R 8/28/2025 37.57 <br /> M-12 8/28/2025 174.26 <br /> M-13R 8/28/2025 125.7 <br /> M-14 8/28/2025 130.82 <br /> M-16 8/28/2025 22.28 <br /> M-17 8/28/2025 30.15 <br />