Laserfiche WebLink
Mr.Lucas J.West <br /> March 5,2024 <br /> Page 2 <br /> Table 2-Monthly Piezometer Elevations <br /> Monitoring Well Piezometer Depth Depth to Water Depth of Water <br /> Identification Observation Date (ft) (ft) (ft) <br /> P6 02/29/2024 72.46 DRY N/A <br /> P7 02/29/2024 92.50 DRY N/A <br /> P8 02/29/2024 97.51 96.65 0.86 <br /> P9 02/29/2024 72.30 71.97 0.33 <br /> P10 02/29/2024 58.30 57.49 0.81 <br /> P11 02/29/2024 41.80 41.42 0.38 <br /> P12 02/29/2024 41.71 41.64 0.07 <br /> P13 02/29/2024 41.34 41.01 0.33 <br /> P14 02/29/2024 41.24 DRY N/A <br /> P15 02/29/2024 41.10 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected February 29,2024,and 840 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected February 29, <br /> 2024,and the flow rate was measured to be approximately 25.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of February 2024,the West Pit Waste Water Treatment Plant(WWTP)was operated intermittently <br /> (3 to 4 days per week) under Colorado Department of Public Health and Environment (CDPHE) CDPS Permit No. <br /> C00045675 for discharge into the Rito Seco alluvial aquifer. During the month, 5,910,400 gallons(18.14 acre-feet) <br /> of treated water was discharged to the Rito Seco and 292,600 gallons (0.90 acre-feet) of water was transferred from <br /> the West Pit to the Lined Tailing Facility (LTF). Additionally, no water was reinfiltrated into the West Pit in <br /> February. <br /> BMRI performed the monthly visual seepage expression inspections on February 29, 2024, in the historic seepage <br /> area identified in Figure 2 of the permit. No seepage expressions were observed in the historic seepage area. <br /> BMRI measured the monthly West Pit backfill, alluvial and monitoring wells as required under the QA/QC Plan. <br /> 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 02/29/2024 24.89 <br /> BF-5R 02/29/2024 30.80 <br /> BF-6 02/29/2024 30.93 <br /> M-6 02/29/2024 DRY <br /> M-7 02/29/2024 DRY <br /> M-8 02/29/2024 DRY <br /> M-9 02/29/2024 141.25 <br /> M-10 02/29/2024 24.39 <br /> M-11R 02/29/2024 36.68 <br /> M-12 02/29/2024 174.45 <br /> M-13R 02/29/2024 125.73 <br /> M-14 02/29/2024 130.62 <br /> M-16 02/29/2024 23.55 <br /> M-17 02/29/2024 30.24 <br />