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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 09/30/2020 72.46 DRY N/A <br /> P7 09/30/2020 92.50 92.29 0.21 <br /> P8 09/30/2020 97.51 96.67 0.84 <br /> P9 09/30/2020 72.30 71.89 0.41 <br /> P10 09/30/2020 58.30 57.58 0.72 <br /> PH 09/30/2020 41.80 41.39 0.41 <br /> P12 09/30/2020 41.71 41.68 0.03 <br /> P13 09/30/2020 41.34 41.04 0.30 <br /> P14 1 09/30/2020 41.24 DRY I N/A <br /> P15 1 09/30/2020 1 41.10 1 40.86 1 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected September 30, 2020 and 840 gallons <br /> were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was <br /> visually inspected September 30, 2020 and the flow rate was measured to be approximately 28.0 gallons <br /> per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of September 2020, 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, 7,032,800 gallons (21.6 acre-feet) of treated water was discharged to the Rito Seco and 564,500 <br /> gallons (1.73 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 /> BMRl performed the monthly visual seepage expression inspections on September 30,2020 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 09/30/2020 24.86 <br /> BF-511 09/30/2020 30.77 <br /> BF-6 09/30/2020 30.90 <br /> M-6 09/30/2020 DRY <br /> M-7 09/30/2020 DRY <br /> M-8 09/30/2020 DRY <br /> M-9 09/30/2020 141.55 <br /> M-10 09/30/2020 24.62 <br /> M-11 R 09/30/2020 37.82 <br /> M-12 09/30/2020 174.77 <br /> M-13R 09/30/2020 124.93 <br /> M44 09/30/2020 130.98 <br /> M-16 09/30/2020 22.86 <br /> M-17 09/30/2020 30.57 <br />