Laserfiche WebLink
Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date 11 11 ft <br /> P6 12/31/2020 72.46 DRY N/A <br /> P7 12/31/2020 92.50 92.29 0.21 <br /> P8 12/31/2020 97.51 96.65 0.86 <br /> P9 12/31/2020 72.30 71.90 0.40 <br /> P10 12/31/2020 58.30 57.61 0.69 <br /> I'll 12/31/2020 41.80 41.40 0.40 <br /> P12 12/31/2020 41.71 41.68 0.03 <br /> P13 12/31/2020 41.34 41.00 0.34 <br /> P14 12/31/2020 41.24 DRY N/A <br /> P 15 12/31/2020 41.10 40.87 0.23 <br /> The leak detection system at the LTF Collection Pond was inspected December 31, 2020 and 890 gallons <br /> were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was <br /> visually inspected December 30, 2020 and the flow rate was measured to be approximately 29.5 gallons <br /> per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of December 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, 7,923,300 gallons (24.3 acre-feet) of treated water was discharged to the Rito Seco and 400,800 <br /> gallons (1.23 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 December 30, 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 12/31/2020 24.97 <br /> BF-5R 12/31/2020 30.83 <br /> BF-6 12/31/2020 30.98 <br /> M-6 12/31/2020 DRY <br /> M-7 12/31/2020 DRY <br /> M-8 12/31/2020 DRY <br /> M-9 12/31/2020 141.14 <br /> M-10 12/31/2020 24.26 <br /> M-11 R 12/31/2020 38.04 <br /> M-12 12/31/2020 174.38 <br /> M-13R 12/31/2020 125.48 <br /> M-14 12/31/2020 130.74 <br /> M-16 12/31/2020 23.98 <br /> M-17 12/31/2020 29.85 <br />