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Table 2-Monthly Piezometer Elevations <br /> M om ,. Piezcl der Depth Depth to Water <br /> 4beirva#aa bate <br /> P6 05/31/2023 72.46 DRY N/A <br /> P7 05/31/2023 92.50 DRY N/A <br /> P8 05/31/2023 97.51 96.67 0.84 <br /> P9 05/31/2023 72.30 71.95 0.35 <br /> P10 05/31/2023 58.30 57.47 0.83 <br /> PH 05/31/2023 41.80 41.40 0.40 <br /> P12 05/31/2023 41.71 41.62 0.09 <br /> P13 05/31/2023 41.34 41.02 0.32 <br /> P14 05/31/2023 41.24 DRY N/A <br /> P151 05/31/2023 1 41.10 1 40.85 1 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected May 31, 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 May 31,2023 and the flow rate was measured to be approximately 29.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of May 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. CO0045675 for discharge into the Rito Seco alluvial aquifer. During the <br /> month, 8,850,800 gallons (27.2 acre-feet) of treated water was discharged to the Rito Seco and 579,000 <br /> gallons (1.78 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, 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 /> n` ` �, e11 Identi #on Observation Date Depth to W er <br /> ft <br /> BF-4 05/31/2023 24.84 <br /> BF-5R 05/31/2023 30.76 <br /> BF-6 05/31/2023 30.82 <br /> M-6 05/31/2023 DRY <br /> M-7 05/31/2023 DRY <br /> M-8 05/31/2023 DRY <br /> M-9 05/31/2023 141.09 <br /> M-10 05/31/2023 23.96 <br /> M-11R 05/31/2023 39.25 <br /> M-12 05/31/2023 174.23 <br /> M-13R 05/31/2023 125.47 <br /> M-14 05/31/2023 130.34 <br /> M-16 05/31/2023 21.21 <br /> M-17 05/31/2023 28.49 <br />