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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 10/29/2020 72.46 DRY N/A <br /> P7 10/29/2020 92.50 92.29 0.21 <br /> P8 10/29/2020 97.51 96.68 0.83 <br /> P9 10/29/2020 72.30 71.89 0.41 <br /> P10 10/29/2020 58.30 57.59 0.71 <br /> P11 10/29/2020 41.80 41.39 0.41 <br /> P12 10/29/2020 41.71 41.68 0.03 <br /> P13 10/29/2020 41.34 41.04 0.30 <br /> P14 10/29/2020 41.24 DRY N/A <br /> P15 10/29/2020 41.10 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected October 29, 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 October 29, 2020 and the flow rate was measured to be approximately 29.0 gallons per <br /> minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of October 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, 6,460,100 gallons (19.8 acre-feet) of treated water was discharged to the Rito Seco and 430,400 <br /> gallons (1.32 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 October 29, 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 /> BMRl 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 10/29/2020 24.93 <br /> BF-511 10/29/2020 30.81 <br /> BF-6 10/29/2020 30.97 <br /> M-6 10/29/2020 DRY <br /> M-7 10/29/2020 DRY <br /> M-8 10/29/2020 DRY <br /> M-9 10/29/2020 141.62 <br /> M-10 10/29/2020 24.60 <br /> M-1111 10/29/2020 37.62 <br /> M-12 10/29/2020 174.78 <br /> M-13R 10/29/2020 125.16 <br /> M-14 10/29/2020 131.08 <br /> M-16 10/29/2020 22.78 <br /> M-17 10/29/2020 30.60 <br />