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Mr.Lucas J.West <br /> October 3,2023 <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 9/28/2023 72.46 DRY N/A <br /> P7 9/28/2023 92.50 DRY N/A <br /> P8 9/28/2023 97.51 96.64 0.87 <br /> P9 9/28/2023 72.30 71.94 0.36 <br /> P10 9/28/2023 58.30 57.48 0.82 <br /> I'll 9/28/2023 41.80 41.39 0.41 <br /> P12 9/28/2023 41.71 41.63 0.08 <br /> P13 9/28/2023 41.34 41.02 0.32 <br /> P14 9/28/2023 41.24 DRY N/A <br /> P15 1 9/28/2023 1 41.10 1 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected September 28, 2023, and 860 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected <br /> September 28,2023,and the flow rate was measured to be approximately 25.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of September 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, 6,430,800 gallons <br /> (19.74 acre-feet) of treated water was discharged to the Rito Seco and 460,800 gallons (1.41 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 September. <br /> BMRI performed the monthly visual seepage expression inspections on September 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 9/28/2023 24.92 <br /> BF-511 9/28/2023 30.82 <br /> BF-6 9/28/2023 30.92 <br /> M-6 9/28/2023 DRY <br /> M-7 9/28/2023 DRY <br /> M-8 9/28/2023 DRY <br /> M-9 9/28/2023 141.18 <br /> M-10 9/28/2023 24.35 <br /> M-1111 9/28/2023 40.01 <br /> M-12 9/28/2023 174.25 <br /> M-13R 9/28/2023 125.58 <br /> M-14 9/28/2023 130.18 <br /> M-16 9/28/2023 22.93 <br /> M-17 9/28/2023 30.25 <br />