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Mr.Lucas J.West <br /> May 2,2024 <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) (ft) <br /> P6 4/30/2024 72.46 DRY N/A <br /> P7 4/30/2024 92.50 DRY N/A <br /> P8 4/30/2024 97.51 96.66 0.85 <br /> P9 4/30/2024 72.30 71.97 0.33 <br /> P10 4/30/2024 58.30 57.48 0.82 <br /> P11 4/30/2024 41.80 41.41 0.39 <br /> P12 4/30/2024 41.71 41.65 0.06 <br /> P13 4/30/2024 41.34 41.02 0.32 <br /> P14 4/30/2024 41.24 DRY N/A <br /> P15 4/30/2024 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected April 30, 2024, and 850 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected April 30, <br /> 2024,and the flow rate was measured to be approximately 25.7 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of April 2024, 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, 7,429,500 gallons (22.8 acre-feet) <br /> of treated water was discharged to the Rito Seco and 961,400 gallons (2.95 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 April. <br /> BMRI performed the monthly visual seepage expression inspections on April 30, 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 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 4/30/2024 24.89 <br /> BF-5R 4/30/2024 30.83 <br /> BF-6 4/30/2024 30.93 <br /> M-6 4/30/2024 DRY <br /> M-7 4/30/2024 DRY <br /> M-8 4/30/2024 DRY <br /> M-9 4/30/2024 141.16 <br /> M-10 4/30/2024 23.91 <br /> M-11R 4/30/2024 39.98 <br /> M-12 4/30/2024 174.27 <br /> M-13R 4/30/2024 125.58 <br /> M-14 4/30/2024 130.42 <br /> M-16 4/30/2024 22.51 <br /> M-17 4/30/2024 30.32 <br />