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Table 2-Monthly Piezometer Elevations <br /> Monitoring We(1 Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date ft ft ft <br /> P6 03/31/2022 72.46 DRY N/A <br /> P7 03/31/2022 92.50 92.29 0.21 <br /> P8 03/31/2022 97.51 96.58 0.93 <br /> P9 03/31/2022 72.30 71.92 0.38 <br /> P10 03/31/2022 58.30 57.48 0.82 <br /> Pl l 03/31/2022 41.80 41.41 0.39 <br /> P12 03/31/2022 41.7] 41.65 0.06 <br /> P13 03/31/2022 41.34 41.01 0.33 <br /> P14 03/31/2022 41.24 DRY N/A <br /> P15 03/31/2022 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected March 31,2022 and 830 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected March 31, 2022 and the flow rate was measured to be approximately 31.0 gallons per minute <br /> �gPm)• <br /> West Pit Waste Water Treatment Plant <br /> During the month of March 2022, 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, 7,218,800 gallons (22.2 acre-feet) of treated water was discharged to the Rito Seco and 287,000 <br /> gallons (0.88 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 March. <br /> BMRI performed the monthly visual seepage expression inspections on March 31, 2022 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 03/31/2022 24.88 <br /> BF-5R 03/31/2022 30.82 <br /> BF-6 03/31/2022 30.95 <br /> M-6 03/31/2022 DRY <br /> M-7 03/31/2022 DRY <br /> M-8 03/31/2022 DRY <br /> M-9 03/31/2022 141.07 <br /> M-10 03/31/2022 24.49 <br /> M-11 R 03/31/2022 39.46 <br /> M-12 03/31/2022 174.11 <br /> M-13R 03/31/2022 125.32 <br /> M-14 03/31/2022 130.20 <br /> M-16 03/31/2022 23.60 <br /> M-17 03/31/2022 30.33 <br />