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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 ft ft <br /> P6 06/30/2021 72.46 DRY N/A <br /> P7 06/30/2021 92.50 92.27 0.23 <br /> P8 06/30/2021 97.51 96.59 0.92 <br /> P9 06/30/2021 72.30 71.91 0.39 <br /> P10 06/30/2021 58.30 57.61 0.69 <br /> I'll 06/30/2021 41.80 41.40 0.40 <br /> P12 06/30/2021 41.71 41.67 0.04 <br /> P13 06/30/2021 41.34 41.03 0.31 <br /> P14 06/30/2021 41.24 DRY N/A <br /> P15 06/30/2021 1 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected June 30, 2021 and 880 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected June 30,2021 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 June 2021, 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, 9,163,800 gallons (28.1 acre-feet) of treated water was discharged to the Rito Seco and 453,300 <br /> gallons (1.39 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 and there was no sludge transferred from the <br /> WWTP drying pad to the LTF. <br /> BMRI performed the monthly visual seepage expression inspections on June 30, 2021 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 06/30/2021 24.93 <br /> BF-5R 06/30/2021 30.83 <br /> BF-6 06/30/2021 30.95 <br /> M-6 06/30/2021 DRY <br /> M-7 06/30/2021 DRY <br /> M-8 06/30/2021 DRY <br /> M-9 06/30/2021 141.49 <br /> M-10 06/30/2021 24.24 <br /> M-11 R 06/30/2021 37.60 <br /> M-12 06/30/2021 174.63 <br /> M-13R 06/30/2021 125.82 <br /> M-14 06/30/2021 130.67 <br /> M-16 06/30/2021 21.54 <br /> M-17 06/30/2021 29.21 <br />