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Mr.Lucas J. West <br /> June 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 5/30/2024 72.46 DRY N/A <br /> P7 5/30/2024 92.50 DRY N/A <br /> P8 5/30/2024 97.51 96.67 0.84 <br /> P9 5/30/2024 72.30 71.96 0.34 <br /> P10 5/30/2024 58.30 57.48 0.82 <br /> P11 5/30/2024 41.80 41.41 0.39 <br /> P12 5/30/2024 41.71 41.64 0.07 <br /> P13 5/30/2024 41.34 41.02 0.32 <br /> P14 5/30/2024 41.24 DRY N/A <br /> P15 5/30/2024 41.10 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected May 30, 2024, and 880 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected May 30, <br /> 2024,and the flow rate was measured to be approximately 28.3 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of May 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, 8,168,600 gallons (25.07 acre-feet) <br /> of treated water was discharged to the Rito Seco and 637,400 gallons (1.96acre-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 May. <br /> BMRI performed the monthly visual seepage expression inspections on May 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 5/31/2024 24.82 <br /> BF-5R 5/31/2024 30.82 <br /> BF-6 5/31/2024 30.90 <br /> M-6 5/31/2024 DRY <br /> M-7 5/31/2024 DRY <br /> M-8 5/31/2024 DRY <br /> M-9 5/31/2024 141.25 <br /> M-10 5/31/2024 23.87 <br /> M-11R 5/31/2024 39.64 <br /> M-12 5/31/2024 174.28 <br /> M-13R 5/31/2024 125.62 <br /> M-14 5/31/2024 130.45 <br /> M-16 5/31/2024 21.59 <br /> M-17 5/31/2024 29.55 <br />