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Table 2-Monthly Piezometer Elevations <br /> Monitioring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date ft ft ft <br /> P6 02/28/2023 72.46 DRY N/A <br /> P7 02/28/2023 92.50 DRY N/A <br /> P8 02/28/2023 97.51 96.67 0.84 <br /> P9 02/28/2023 72.30 71.95 0.35 <br /> 1310 02/28/2023 58.30 57.47 0.83 <br /> I'll 02/28/2023 41.80 41.40 0.40 <br /> P12 02/28/2023 41.71 41.64 0.07 <br /> P13 02/28/2023 41.34 41.00 0.34 <br /> P14 1 02/28/2023 1 41.24 1 DRY N/A <br /> P15 1 02/28/2023 1 41.10 1 40.80 1 0.30 <br /> The leak detection system at the LTF Collection Pond was inspected February 28, 2023 and 880 gallons <br /> were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was <br /> visually inspected February 28,2023 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 February 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, 6,404,200 gallons (19.7 acre-feet) of treated water was discharged to the Rito Seco and 249,200 <br /> gallons (0.76 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 February. <br /> BMRl performed the monthly visual seepage expression inspections on February 28, 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 /> 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 /> BF4 02/28/2023 24.90 <br /> BF-511 02/28/2023 30.85 <br /> BF-6 02/28/2023 30.94 <br /> M-6 02/28/2023 DRY <br /> M-7 02/28/2023 DRY <br /> M-8 02/28/2023 DRY <br /> M-9 02/28/2023 141.09 <br /> M-10 02/28/2023 24.37 <br /> M-11 R 02/28/2023 39.62 <br /> M-12 02/28/2023 174.18 <br /> M-13R 02/28/2023 125.40 <br /> M-14 02/28/2023 130.28 <br /> M-16 02/28/2023 23.20 <br /> M-17 02/28/2023 30.17 <br />