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Mr.Lucas J.West <br /> February 5,2024 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Observation Date Piezometer Depth Depth to Water Depth of Water <br /> Identification (ft) (ft) (ft) <br /> P6 01/31/2024 72.46 DRY N/A <br /> P7 01/31/2024 92.50 DRY N/A <br /> P8 01/31/2024 97.51 96.64 0.87 <br /> P9 01/31/2024 72.30 71.97 0.33 <br /> P10 01/31/2024 58.30 57.48 0.82 <br /> P11 01/31/2024 41.80 41.41 0.39 <br /> P12 01/31/2024 41.71 41.63 0.08 <br /> P13 01/31/2024 41.34 41.02 0.32 <br /> P14 01/31/2024 41.24 DRY N/A <br /> P15 01/31/2024 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected January 31, 2024, and 870 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected January 31, <br /> 2024,and the flow rate was measured to be approximately 25.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of January 2024, 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, 7,289,600 gallons (22.37 acre-feet) <br /> of treated water was discharged to the Rito Seco and 415,300 gallons (1.27 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 /> January. <br /> BMRI performed the monthly visual seepage expression inspections on January 31, 2024, 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 in 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 02/01/2024 24.93 <br /> BF-5R 02/01/2024 30.84 <br /> BF-6 02/01/2024 30.97 <br /> M-6 02/01/2024 DRY <br /> M-7 02/01/2024 DRY <br /> M-8 02/01/2024 DRY <br /> M-9 02/01/2024 141.32 <br /> M-10 02/01/2024 24.34 <br /> M-11R 02/01/2024 39.73 <br /> M-12 02/01/2024 174.32 <br /> M-13R 02/01/2024 125.62 <br /> M-14 02/01/2024 130.46 <br /> M-16 02/01/2024 23.51 <br /> M-17 02/01/2024 30.34 <br />