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Mr.Lucas J.West <br /> April 3,2025 <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 ft ft <br /> P6 3/31/2025 72.46 DRY N/A <br /> 117 3/31/2025 92.50 DRY N/A <br /> 1's 3/31/2025 97.51 96.69 0.82 <br /> P9 3/31/2025 72.30 71.98 0.32 <br /> P10 3/31/2025 58.30 57.48 0.82 <br /> P11 3/31/2025 41.80 41.41 0.39 <br /> P12 3/31/2025 41.71 41.65 0.06 <br /> P13 3/31/2025 41.34 41.03 0.31 <br /> P 14 3/31/2025 41.24 1 DRY N/A <br /> P15 3/31/2025 1 41.10 1 40.88 1 0.22 <br /> The leak detection system at the LTF Collection Pond was inspected March 31, 2025, and 960 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected March 31, <br /> 2025,and the flow rate was measured to be approximately 27.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of March 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, 6,318,400 gallons(19.39 acre-feet) <br /> of treated water was discharged to the Rito Seco and 509,800 gallons (1.56 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 March. <br /> BMRI performed the monthly visual seepage expression inspections on March 31, 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 /> BMRl 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 3/31/2025 24.81 <br /> BF-511 3/31/2025 30.78 <br /> BF-6 3/31/2025 30.89 <br /> M-6 3/31/2025 DRY <br /> M-7 3/31/2025 DRY <br /> M-8 3/31/2025 DRY <br /> M-9 3/31/2025 141.09 <br /> M-10 3/31/2025 23.73 <br /> M-11 R 3/31/2025 38.93 <br /> M-12 3/31/2025 174.21 <br /> M-13 R 3/31/2025 125.58 <br /> M-14 3/31/2025 130.47 <br /> M-16 3/31/2025 23.34 <br /> M-17 3/31/2025 30.26 <br />