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Mr. Lucas J. West <br /> July 6,2024 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well t Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Dae ft ft ft <br /> P6 627/2024 72.46 DRY N/A <br /> P7 6/27/2024 92.50 DRY N/A <br /> P8 627/2024 97.51 96.66 0.85 <br /> P9 6/27/2024 7230 71.96 0.34 <br /> 1310 6/27i2024 58.30 57.47 0.83 <br /> 1311 6/27/2024 41.80 41.40 0.4 <br /> P12 6/27/2024 41.71 41.63 0.08 <br /> P13 6/27/2024 41.34 41.03 0.31 <br /> P14 6/27/2024 41.24 DRY N/A <br /> P15 6/27/2024 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected June 27, 2024, and 830 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected June 27, <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 June 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, 7,255,400 gallons (22.27 acre-feet) <br /> of treated water was discharged to the Rito Seco and 491,300 gallons (1.51 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 June. <br /> BMRI performed the monthly visual seepage expression inspections on June 27, 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-4 627/2024 24.84 <br /> BF-511 6/27/2024 30.79 <br /> BF-6 6/27/2024 30.88 <br /> M-6 6,127/2024 DRY <br /> M-7 6,27/2024 DRY <br /> M-8 6/27/2024 DRY <br /> M-9 627/2024 141.26 <br /> M-10 6 27/2024 23.97 <br /> M-1111 6/27/2024 39.43 <br /> M-12 627/2024 174.34 <br /> M-13R 627/2024 125.68 <br /> M-14 6/27/2024 130.50 <br /> NI-16 6127/2024 21.58 <br /> M-17 6,27/2024 29.59 <br />