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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 11 <br /> P6 08/31/2020 72.46 DRY N/A <br /> P7 08/31/2020 92.50 92.29 0.21 <br /> P8 08/31/2020 97.51 96.69 0.82 <br /> P9 08/31/2020 72.30 71.89 0.41 <br /> 1310 08/31/2020 58.30 57.57 0.73 <br /> PH 08/31/2020 41.80 41.39 0.41 <br /> P 12 08/31/2020 41.71 41.68 0.03 <br /> P13 08/31/2020 41.34 41.04 0.30 <br /> P14 1 08/31/2020 1 41.24 1 DRY N/A <br /> P 15 1 08/31/2020 1 41.10 1 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected August 31,2020 and 900 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected August 31, 2020 and the flow rate was measured to be approximately 30.0 gallons per minute <br /> (gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of August 2020, 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, 6,477,600 gallons (19.9 acre-feet) of treated water was discharged to the Rito Seco and 191,900 <br /> gallons (0.59 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 and there was no sludge transferred from the <br /> WWTP drying pad to the LTF. <br /> BMRI performed the monthly visual seepage expression inspections on August 31, 2020 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 08/31/2020 24.92 <br /> BF-511 08/31/2020 30.81 <br /> BF-6 08/31/2020 30.95 <br /> M-6 08/31/2020 DRY <br /> M-7 08/31/2020 DRY <br /> M-8 08/31/2020 DRY <br /> M-9 08/31/2020 141.46 <br /> M-10 08/31/2020 25.02 <br /> M-11R 08/31/2020 38.20 <br /> M-12 08/31/2020 174.61 <br /> M-13R 08/31/2020 124.87 <br /> M-14 08/31/2020 130.82 <br /> M-16 08/31/2020 22.98 <br /> M-17 08/31/2020 30.54 <br />