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Mr.Lucas J.West <br /> November 4,2024 <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) p If <br /> P6 10/31/2024 72.46 DRY N/A <br /> P7 10/31/2024 92.50 DRY N/A <br /> P8 10/31/2024 97.51 96.70 0.81 <br /> P9 10/31/2024 72.30 71.96 0.34 <br /> P10 10/31/2024 58.30 57.46 0.84 <br /> PH 10/31/2024 41.80 41.41 0.39 <br /> P12 10/31/2024 41.71 41.64 0.07 <br /> P13 10/31/2024 41.34 41.02 0.32 <br /> P14 10/31/2024 41.24 DRY N/A <br /> P15 10/31/2024 41.10 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected October 31, 2024, and 950 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected October 31, <br /> 2024,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 October 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, 9,014,000 gallons (27.66 acre-feet) <br /> of treated water was discharged to the Rito Seco and 937,900 gallons (2.88 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 /> October. <br /> BMRI performed the monthly visual seepage expression inspections on October 31, 2024, in the historic seepage <br /> area 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 10/31/2024 24.68 <br /> BF-5R 10/31/2024 30.72 <br /> BF-6 10/31/2024 30.73 <br /> M-6 10/31/2024 DRY <br /> M-7 10/31/2024 DRY <br /> M-8 10/31/2024 DRY <br /> M-9 10/31/2024 141.04 <br /> M-10 10/31/2024 23.74 <br /> M-11R 10/31/2024 38.69 <br /> M-12 10/31/2024 174.3 <br /> M-13R 10/31/2024 125.32 <br /> M-14 10/31/2024 130.48 <br /> M-16 10/31/2024 22.16 <br /> M-17 10/31/2024 30.04 <br />