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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 05/28/2020 72.46 DRY N/A <br /> P7 05/28/2020 92.50 92.29 0.21 <br /> P8 05/28/2020 97.51 96.66 0.85 <br /> P9 05/28/2020 72.30 71.88 0.42 <br /> P10 05/28/2020 58.30 57.55 0.75 <br /> PH 05/28/2020 41.80 41.39 0.41 <br /> P12 05/28/2020 41.71 41.68 0.03 <br /> P13 05/28/2020 41.34 41.04 0.30 <br /> P14 05/28/2020 41.24 DRY N/A <br /> P15 05/28/2020 41.10 40.86 0.24 <br /> The leak detection system at the LTF Collection Pond was inspected May 28, 2020 and 880 gallons were <br /> evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually <br /> inspected May 28,2020 and the flow rate was measured to be approximately 36.0 gallons per minute(gpm). <br /> West Pit Waste Water Treatment Plant <br /> During the month of May 2020, the West Pit Waste Water Treatment Plant(WWTP) was operated under <br /> Colorado Department of Public Health and Environment (CDPHE) CDPS Permit No. C00045675 and <br /> discharged 6,444,600 gallons (19.8 acre-feet) of treated water into the Rito Seco alluvial aquifer. <br /> Additionally,423,200 gallons(1.30 acre-feet)of water was transferred from the West Pit to the LTF. There <br /> was 321 cubic yards of sludge transferred from the WWTP drying pad to the LTF during the period of May <br /> 30 to June 1,2020. <br /> BMRI performed the monthly visual seepage expression inspections on May 28, 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 05/28/2020 24.93 <br /> BF-511 05/28/2020 30.83 <br /> BF-6 05/28/2020 30.94 <br /> M-6 05/28/2020 DRY <br /> M-7 05/28/2020 DRY <br /> M-8 05/28/2020 DRY <br /> M-9 05/28/2020 141.72 <br /> M-10 05/28/2020 25.06 <br /> M-1111 05/28/2020 37.88 <br /> M-12 05/28/2020 174.93 <br /> M-13R 05/28/2020 125.98 <br /> M-14 05/28/2020 131.08 <br /> M-16 05/28/2020 22.23 <br /> M-17 05/28/2020 29.78 <br /> M-18 05/28/2020 26.65 <br />