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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 ft <br /> P6 12/31/2019 72.46 DRY N/A <br /> P7 12/31/2019 92.50 92.28 0.22 <br /> P8 12/31/2019 97.51 96.67 0.84 <br /> P9 12/31/2019 72.30 71.89 0.41 <br /> 1110 12/31/2019 58.30 57.55 0.75 <br /> PH 12/31/2019 41.80 41.38 0.42 <br /> P12 12/31/2019 41.71 41.68 0.03 <br /> P13 12/31/2019 41.34 41.02 0.32 <br /> P14 1 12/31/2019 1 41.24 1 DRY N/A <br /> P15 1 12/31/2019 1 41.10 1 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected December 31, 2019. A total of 890 <br /> gallons (27.0 GPD) were evacuated from the leak detection system and pumped to the LTF. The LTF <br /> underdrain system was visually inspected December 31, 2019 and the flow rate was measured to be <br /> approximately 33.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of December 2019, the West Pit Waste Water Treatment Plant (WWTP) was operated <br /> under Colorado Department of Public Health and Environment(CDPHE) CDPS Permit No. C00045675 <br /> and discharged 7,017,500 gallons (21.5 acre-feet) of treated water into the Rito Seco alluvial aquifer. <br /> Additionally, 851,200 gallons(2.6 acre-feet)of water was transferred from the West Pit to the LTF. There <br /> was no sludge transferred from the WWTP drying pad to the LTF. <br /> BMRl performed the monthly visual seepage expression inspections on December 31, 2019 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. On December 4, 2019, monitoring well M-15 was abandoned as approved in Technical <br /> Revision JR)35 and can no longer be sampled. Measurements obtained for the monthly wells are shown <br /> 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 12/31/2019 24.89 <br /> BF-5R 12/31/2019 30.77 <br /> BF-6 12/31/2019 30.91 <br /> M-6 12/31/2019 DRY <br /> M-7 12/31/2019 DRY <br /> M-8 12/31/2019 DRY <br /> M-9 12/31/2019 141.58 <br /> M-10 12/31/2019 25.33 <br /> M-11 R 12/31/2019 38.25 <br /> M-12 12/31/2019 174.95 <br /> M-13R 12/31/2019 125.96 <br /> M-14 12/31/2019 131.07 <br />