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Mr. Lucas J.West <br /> January 6,2025 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date 11 ft ft <br /> P6 1/31/2025 72.46 DRY N/A <br /> P 7 1/31/2025 92.50 DRY N/A <br /> 118 1/31/2025 97.51 96.68 0.83 <br /> 119 1/31/2025 72.30 71.97 0.33 <br /> P 10 1/31/2025 58.30 57.45 0.85 <br /> P I 1 1/31/2025 41.80 41.41 0.39 <br /> 1112 1/31/2025 41.71 41.64 0.07 <br /> 1113 1/31/2025 41.34 41 0.34 <br /> P 14 1/31/2025 41.24 DRY N/A <br /> P 15 1 1/31/2025 1 41.10 40.89 1 0.21 <br /> The leak detection system at the LTF Collection Pond was inspected January 31, 2025, and 950 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected January 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 January 2025, the West Pit Waste Water Treatment Plant(W WTP)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, 6,609,600 gallons (20.28 acre-feet) <br /> of treated water was discharged to the Rito Seco and 0 gallons (0 acre-feet) of water was transferred from the West <br /> Pit to the Lined Tailing Facility(LTF). Additionally, no water was reinfiltrated into the West Pit in January. <br /> BMRI performed the monthly visual seepage expression inspections on January 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 /> 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 1/31/2025 24.81 <br /> BF-5R 1/31/2025 30.83 <br /> BF-6 1/31/2025 30.92 <br /> M-6 1/31/2025 DRY <br /> M-7 1/31/2025 DRY <br /> M-8 1/31/2025 DRY <br /> M-9 1/31/2025 141.21 <br /> M-10 1/31/2025 23.97 <br /> M-11 R 1/31/2025 39.08 <br /> M-12 1/31/2025 174.36 <br /> M-13 R 1/31/2025 125.63 <br /> M-14 1/31/2025 130.48 <br /> M-16 1/31/2025 22.99 <br /> M-17 1/31/2025 30.21 <br />