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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 10/27/2021 72.46 DRY N/A <br /> P7 10/27/2021 92.50 92.27 0.23 <br /> P8 10/27/2021 97.51 96.56 0.95 <br /> P9 10/27/2021 72.30 71.91 0.39 <br /> P10 10/27/2021 58.30 57.61 0.69 <br /> Pl l 10/27/2021 41.80 41.40 0.40 <br /> P12 10/27/2021 41.71 41.67 0.04 <br /> P13 10/27/2021 41.34 41.02 0.32 <br /> P14 10/27/2021 41.24 DRY N/A <br /> P15 10/27/2021 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected October 27, 2021 and 860 gallons <br /> were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was <br /> visually inspected October 27,2021 and the flow rate was measured to be approximately 31.9 gallons per <br /> minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of October 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, 7,179,200 gallons (22.0 acre-feet) of treated water was discharged to the Rito Seco and 453,200 <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 in October. <br /> BMRI performed the monthly visual seepage expression inspections on October 27, 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 /> BF4 10/29/2021 24.85 <br /> BF-5R 10/29/2021 30.78 <br /> BF-6 10/29/2021 30.93 <br /> M-6 10/29/2021 DRY <br /> M-7 10/29/2021 DRY <br /> M-8 10/29/2021 DRY <br /> M-9 10/29/2021 141.47 <br /> M-10 10/29/2021 24.29 <br /> M-11R 10/29/2021 38.02 <br /> M-12 10/29/2021 174.64 <br /> M-13R 10/29/2021 125.83 <br /> M-14 10/29/2021 130.66 <br /> M-16 10/29/2021 23.33 <br /> M-17 10/29/2021 29.81 <br />