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Table 2-Monthly Piezometer Elevations <br /> Mo itoring Well Piezometer Depth Depth to Water Depth of Water <br /> I ntification Observation Date ft ft ft <br /> P6 01/31/2023 72.46 DRY N/A <br /> P7 01/31/2023 92.50 DRY N/A <br /> P8 01/31/2023 97.51 96.66 0.85 <br /> P9 01/31/2023 72.30 71.95 0.35 <br /> 1,10 01/31/2023 58.30 57.48 0.82 <br /> Pll 01/31/2023 41.80 41.41 0.39 <br /> P12 01/31/2023 41.71 41.63 0.08 <br /> P13 01/31/2023 41.34 41.03 0.31 <br /> P14 01/31/2023 41.24 DRY N/A <br /> P15 01/31/2023 1 41.10 40.84 1 0.26 <br /> The leak detection system at the LTF Collection Pond was inspected January 31, 2023 and 870 gallons <br /> were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was <br /> visually inspected January 31, 2023 and the flow rate was measured to be approximately 31.5 gallons per <br /> minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of January 2023, 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, 7,614,700 gallons (23.4 acre-feet) of treated water was discharged to the Rito Seco and 629,500 <br /> gallons (1.93 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 January. <br /> BMRI performed the monthly visual seepage expression inspections on January 31, 2023 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 /> Mobitoring Well Identification Observation Date Depth to Water <br /> ft <br /> BF4 01/31/2023 24.91 <br /> BF-51Z 01/31/2023 30.84 <br /> BF-6 01/31/2023 30.95 <br /> M-6 01/31/2023 DRY <br /> M-7 01/31/2023 DRY <br /> M-8 01/31/2023 DRY <br /> M-9 01/31/2023 141.17 <br /> M-10 01/31/2023 24.30 <br /> M-11 R 01/31/2023 39.03 <br /> M-12 01/31/2023 174.28 <br /> M-13R 01/31/2023 125.50 <br /> M-14 01/31/2023 130.38 <br /> M-16 01/31/2023 22.99 <br /> M-17 01/31/2023 30.06 <br />