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Mr.Lucas J.West <br /> August 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 7/31/2024 72.46 DRY N/A <br /> P7 7/31/2024 92.50 DRY N/A <br /> P8 7/31/2024 97.51 96.70 0.81 <br /> P9 7/31/2024 72.30 71.97 0.33 <br /> P10 7/31/2024 58.30 _ 57.47 0.83 <br /> P11 7/31/2024 41.80 41.4 0.4 <br /> P12 7/31/2024 41.71 41.64 0.07 <br /> P13 7/31/2024 41.34 41.02 0.32 <br /> P14 7/31/2024 41.24 DRY N/A <br /> P15 7/31/2024 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected July 31,2024,and 880 gallons were evacuated from <br /> the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected July 31,2024,and <br /> 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 July 2024,the West Pit Waste Water Treatment Plant(WWTP)was operated intermittently(3 to <br /> 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, 8,597,700 gallons (26.39 acre-feet) <br /> of treated water was discharged to the Rito Seco and 572,900 gallons (1.76 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 July. <br /> BMRI performed the monthly visual seepage expression inspections on July 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 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 7/31/2024 24.81 <br /> BF-5R 7/31/2024 30.78 <br /> BF-6 7/31/2024 30.85 <br /> M-6 7/31/2024 DRY <br /> M-7 7/31/2024 DRY <br /> M-8 7/31/2024 DRY <br /> M-9 7/31/2024 141.11 <br /> M-10 7/31/2024 24.08 <br /> M-11R 7/31/2024 39.44 <br /> M-12 7/31/2024 174.29 <br /> M-13R 7/31/2024 125.66 <br /> M-14 7/31/2024 130.49 <br /> M-16 7/31/2024 22.39 <br /> M-17 7/31/2024 29.98 <br />