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Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Pie"Ineter Depth Depth to Water Depth of Water <br /> Identirkatfon Observation Date tt fi 11 <br /> P6 05/31/2022 72.46 DRY N/A <br /> P7 05/31/2022 92.50 92.28 0.22 <br /> P8 05/31/2022 97.51 96.64 0.87 <br /> P9 05/31/2022 72.30 71.94 0.36 <br /> P10 05/31/2022 58.30 57.49 0.81 <br /> Pl 1 05/31/2022 41.80 41.39 0.41 <br /> P12 05/31/2022 41.71 41.65 0.06 <br /> P13 05/31/2022 41.34 41.01 0.33 <br /> P14 05/31/2022 41.24 DRY N/A <br /> P15 1 05/31/2022 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected May 31,2022 and 870 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected May 31,2022 and the flow rate was measured to be approximately 32.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of May 2022, 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 <br /> (CDPHE) CDPS Permit No. C00045675 for discharge into the Rito Seco alluvial aquifer. During the <br /> month, 7,167,700 gallons (22.0 acre-feet) of treated water was discharged to the Rito Seco and 390,500 <br /> gallons (1.20 acre-feet) of water was transferred from the West Pit to the Lined Tailing Facility (LTF). <br /> Additionally,no water was reinfiltrated into the West Pit in May. <br /> BMRI performed the monthly visual seepage expression inspections on May 31, 2022 in the historic <br /> seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic <br /> seepage area. <br /> BMRI measured the monthly West Pit backfill, alluvial and monitoring wells as required under in the <br /> QA/QC Plan. 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 05/31/2022 24.90 <br /> BF-5R 05/31/2022 30.79 <br /> BF-6 05/31/2022 30.92 <br /> M-6 05/31/2022 DRY <br /> M-7 05/31/2022 DRY <br /> M-8 05/31/2022 DRY <br /> M-9 05/31/2022 141.43 <br /> M-10 05/31/2022 24.54 <br /> M-11R 05/31/2022 39.18 <br /> M-12 05/31/2022 174.58 <br /> M-13R 05/31/2022 125.85 <br /> M-14 05/31/2022 130.91 <br /> M-16 05/31/2022 22.78 <br /> M-17 05/31/2022 29.95 <br />