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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 09/30/2021 72.46 DRY N/A <br /> P7 09/30/2021 92.50 92.27 0.23 <br /> P8 09/30/2021 97.51 96.57 0.94 <br /> P9 09/30/2021 72.30 71.91 0.39 <br /> P10 09/30/2021 58.30 57.61 0.69 <br /> I'll 09/30/2021 41.80 41.41 0.39 <br /> P12 09/30/2021 41.71 41.67 0.04 <br /> P13 09/30/2021 41.34 41.02 0.32 <br /> P14 09/30/2021 41.24 DRY N/A <br /> P15 09/30/2021 1 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected September 30,2021 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, 2021 and the flow rate was measured to be approximately 31.0 gallons <br /> per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of September 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, 6,664,700 gallons (20.5 acre-feet) of treated water was discharged to the Rito Seco and 364,200 <br /> gallons (1.12 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 September. <br /> BMRI performed the monthly visual seepage expression inspections on September 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 09/30/2021 24.91 <br /> BF-5R 09/30/2021 30.81 <br /> BF-6 09/30/2021 30.94 <br /> M-6 09/30/2021 DRY <br /> M-7 09/30/2021 DRY <br /> M-8 09/30/2021 DRY <br /> M-9 09/30/2021 141.33 <br /> M-10 09/30/2021 24.50 <br /> M-11R 09/30/2021 38.14 <br /> M-12 09/30/2021 174.53 <br /> M-13R 09/30/2021 125.72 <br /> M-14 09/30/2021 130.58 <br /> M-16 09/30/2021 23.51 <br /> M-17 09/30/2021 30.14 <br />