Laserfiche WebLink
Mr. Lucas J.West <br /> September 3,2024 <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 8/29/2024 72.46 DRY N/A <br /> P7 8/29/2024 92.50 DRY N/A <br /> P8 8/29/2024 97.51 96.71 0.80 <br /> P9 8/29/2024 72.30 71.97 0.33 <br /> P10 8/29/2024 58.30 57.45 0.85 <br /> P11 8/29/2024 41.80 41.41 0.39 <br /> P12 8/29/2024 41.71 41.64 0.07 <br /> P13 8/29/2024 41.34 41.03 0.31 <br /> P14 8/29/2024 41.24 DRY N/A <br /> P15 8/29/2024 41.10 40.85 0.25 <br /> The leak detection system at the LTF Collection Pond was inspected August 29, 2024, and 820 gallons were evacuated <br /> from the leak detection system and pumped to the LTF. The LTF underdrain system was visually inspected August 29, <br /> 2024,and the flow rate was measured to be approximately 28.5 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of August 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, 6,980,000 gallons (21.42 acre-feet) <br /> of treated water was discharged to the Rito Seco and 461,300 gallons (1.42 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 August. <br /> BMRI performed the monthly visual seepage expression inspections on August 29, 2024, in the historic seepage area <br /> 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 8/29/2024 24.85 <br /> BF-5R 8/29/2024 30.85 <br /> BF-6 8/29/2024 30.89 <br /> M-6 8/29/2024 DRY <br /> M-7 8/29/2024 DRY <br /> M-8 8/29/2024 DRY <br /> M-9 8/29/2024 141.11 <br /> M-10 8/29/2024 24.15 <br /> M-11R 8/29/2024 39.4 <br /> M-12 8/29/2024 174.25 <br /> M-13R 8/29/2024 125.56 <br /> M-14 8/29/2024 130.42 <br /> M-16 8/29/2024 23.01 <br /> M-17 8/29/2024 30.29 <br />