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Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date ft R R <br /> P6 04/27/2023 72.46 DRY N/A <br /> P7 04/27/2023 92.50 DRY N/A <br /> P8 04/27/2023 97.51 96.65 0.86 <br /> P9 04/27/2023 72.30 71.95 0.35 <br /> 1310 04/27/2023 58.30 57.48 0.82 <br /> I'll 04/27/2023 41.80 41.39 0.41 <br /> P12 04/27/2023 41.71 41.63 0.08 <br /> P13 04/27/2023 41.34 41.03 0.31 <br /> P14 1 04/27/2023 41.24 DRY N/A <br /> PIS 1 04/27/2023 41.10 40.86 1 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected April 27, 2023 and 880 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected April 27, 2023 and the flow rate was measured to be approximately 31.0 gallons per minute <br /> (gpm)• <br /> West Pit Waste Water Treatment Plant <br /> During the month of April 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 <br /> (CDPHE) CDPS Permit No. C00045675 for discharge into the Rito Seco alluvial aquifer. During the <br /> month, 6,823,600 gallons (20.9 acre-feet) of treated water was discharged to the Rito Seco and 241,300 <br /> gallons (0.74 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 April. <br /> BMRl performed the monthly visual seepage expression inspections on April 27, 2023 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 /> BF-4 04/27/2023 24.81 <br /> BF-5R 04/27/2023 30.78 <br /> BF-6 04/27/2023 30.86 <br /> M-6 04/27/2023 DRY <br /> M-7 04/27/2023 DRY <br /> M-8 04/27/2023 DRY <br /> M-9 04/27/2023 141.21 <br /> M-10 04/27/2023 24.20 <br /> M-11R 04/27/2023 39.84 <br /> M-12 04/27/2023 174.39 <br /> M-13R 04/27/2023 125.69 <br /> M-14 04/27/2023 130.51 <br /> M-16 04/27/2023 22.56 <br /> M-17 04/27/2023 29.89 <br />