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Mr.Lucas J.West <br /> January 3,2023 <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 12/28/2023 72.46 DRY N/A <br /> P7 12/28/2023 92.50 DRY N/A <br /> P8 12/28/2023 97.51 96.65 0.86 <br /> P9 12/28/2023 72.30 71.96 0.34 <br /> P10 12/28/2023 58.30 57.46 0.84 <br /> I'll 12/28/2023 41.80 41.42 0.38 <br /> P12 12/28/2023 41.71 41.64 0.07 <br /> P13 12/28/2023 41.34 41.01 0.33 <br /> P14 12/28/2023 41.24 DRY N/A <br /> P15 12/28/2023 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected December 28, 2023, and 810 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected <br /> December 28,2023,and the flow rate was measured to be approximately 25.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of December 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, 5,847,500 gallons <br /> (17.95 acre-feet) of treated water was discharged to the Rito Seco and 0 gallons (0 acre-feet)of water was transferred <br /> from the West Pit to the Lined Tailing Facility (LTF). Additionally, no water was reinfiltrated into the West Pit in <br /> December. <br /> BMRI performed the monthly visual seepage expression inspections on December 28, 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 /> BF-4 12/28/2023 24.93 <br /> BF-511 12/28/2023 30.82 <br /> BF-6 12/28/2023 30.96 <br /> M-6 12/28/2023 DRY <br /> M-7 12/28/2023 DRY <br /> M-8 12/28/2023 DRY <br /> M-9 12/28/2023 141.23 <br /> M-10 12/28/2023 24.33 <br /> M-11R 12/28/2023 39.98 <br /> M-12 12/28/2023 174.39 <br /> M-13R 12/28/2023 125.68 <br /> M-14 12/28/2023 130.52 <br /> M-16 12/28/2023 23.18 <br /> M-17 12/28/2023 30.29 <br />