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Mr.Lucas J.West <br /> March 4,2025 <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 t't ft <br /> P6 2/27/2025 72.46 DRY N/A <br /> P7 2/27/2025 92.50 DRY N/A <br /> P8 2/27/2025 97.51 96.69 0.82 <br /> P9 2/27/2025 72.30 71.97 0.33 <br /> 1310 2/27/2025 58.30 57.47 0.83 <br /> P11 2/27/2025 41.80 41.4 0.4 <br /> P12 2/27/2025 41.71 41.64 0.07 <br /> P13 2/27/2025 41.34 41.01 0.33 <br /> P14 1 2/27/2025 1 41.24 1 DRY N/A <br /> P15 1 2/27/2025 1 41.10 1 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected February 27,2025,and 970 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected February 27, <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 February 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, 5,899,100 gallons(18.10 acre-feet) <br /> of treated water was discharged to the Rito Seco and 410,600 gallons (1.26 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 <br /> February. <br /> BMRl performed the monthly visual seepage expression inspections on February 27, 2025, in the historic seepage <br /> area 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 2/27/2025 24.89 <br /> BF-511 2/27/2025 30.81 <br /> BF-6 2/27/2025 30.94 <br /> M-6 2/27/2025 DRY <br /> M-7 2/27/2025 DRY <br /> M-8 2/27/2025 DRY <br /> M-9 2/27/2025 141.38 <br /> M-10 2/27/2025 23.92 <br /> M-11 R 2/27/2025 39.21 <br /> N I-12 2/27/2025 174.53 <br /> M-13R 2/27/2025 125.83 <br /> M-14 2/27/2025 130.69 <br /> M-16 2/27/2025 23.56 <br /> M-17 2/27/2025 30.25 <br />