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Mr.Lucas J.West <br /> December 6,2023 <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 11/30/2023 72.46 DRY N/A <br /> P7 11/30/2023 92.50 DRY N/A <br /> P8 11/30/2023 97.51 96.63 0.88 <br /> P9 11/30/2023 72.30 71.96 0.34 <br /> Pl o 11/30/2023 58.30 57.48 0.82 <br /> I'll 11/30/2023 41.80 41.41 0.39 <br /> P12 11/30/2023 41.71 41.63 0.08 <br /> P13 11/30/2023 41.34 41.00 0.34 <br /> P14 11/30/2023 41.24 DRY N/A <br /> P15 1 11/30/2023 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected November 29, 2023, and 880 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected <br /> November 30,2023,and the flow rate was measured to be approximately 26.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of November 2023, the West Pit Waste Water Treatment Plant (WWTP) was operated <br /> intermittently(3 to 4 days per week)under Colorado Department of Public Health and Environment(CDPHE) CDPS <br /> Permit No. C00045675 for discharge into the Rito Seco alluvial aquifer. During the month, 7,282,900 gallons <br /> (22.35 acre-feet) of treated water was discharged to the Rito Seco and 578,800 gallons (1.78 acre-feet) of water was <br /> transferred from the West Pit to the Lined Tailing Facility (LTF). Additionally, no water was reinfiltrated into the <br /> West Pit in November. <br /> BMRI performed the monthly visual seepage expression inspections on November 30, 2023, 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 in 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 /> BF4 11/30/2023 24.90 <br /> BF-5R 11/30/2023 30.81 <br /> BF-6 11/30/2023 30.91 <br /> M-6 11/30/2023 DRY <br /> M-7 11/30/2023 DRY <br /> M-8 11/30/2023 DRY <br /> M-9 11/30/2023 140.89 <br /> M-10 11/30/2023 24.24 <br /> M-11R 11/30/2023 40.13 <br /> M-12 11/30/2023 173.94 <br /> M-13R 11/30/2023 125.23 <br /> M-14 11/30/2023 130.09 <br /> M-16 11/30/2023 22.78 <br /> M-17 11/30/2023 30.22 <br />