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Table 2 - Monthly Piezometer Elevations <br />Monitoring WellPiezometer <br />Identification <br />Observation'Date <br />Depth <br />.R <br />Depth -to Water <br />ft <br />Depth of Water <br />ft <br />P6 <br />04/29/2018 <br />72.46 <br />DRY <br />0.00 <br />P7 <br />04/29/2018 <br />92.50 <br />92.29 <br />0.21 <br />P8 <br />04/29/2018 <br />97.51 <br />96.53 <br />0.98 <br />P9 <br />04:29..'2018 <br />72.30 <br />71.96 <br />0.34 <br />P10 <br />04/29.2018 <br />58.30 <br />57.56 <br />0.74 <br />PH <br />04129/2018 <br />41.80 <br />41.39 <br />0.41 <br />P12 <br />0412912018 <br />41.71 <br />41.69 <br />0.02 <br />P13 <br />04/29/2018 <br />41.34 <br />41.03 <br />0.31 <br />P14 1 <br />04129/2018 <br />1 41.24 <br />41.22 <br />1 0.02 <br />P15 1 <br />04/29/2018 <br />1 41.10 <br />40.85 <br />1 0.25 <br />The leak detection system at the TSF Collection Pond was inspected April 29, 2018. A total of 850 gallons <br />(25.8 GPD) were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain <br />system flow was measured to be approximately 39.0 gallons per minute (gpm). <br />West Pit Waste Water Treatment Plant <br />During the month of April 2018, the West Pit Water Treatment Plant was operated under Colorado <br />Department of Public Health and Environment (CDPHE) CDPS Permit No. C00045675 for discharge into <br />the Rito Seco alluvial aquifer. During the month of April, 7,059,900 gallons (21.7 acre-feet) of treated <br />water was discharged to the Rito Seco. There was no water transferred from the West Pit to the LTF in <br />April 2018. There was no sludge transferred from the water treatment plant drying pad to the LTF. <br />BMRI performed the monthly visual seepage expression inspections on April 29, 2018 in the historic <br />seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic <br />seepage area during April 2018. <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 <br />Observation Date <br />Depth to Water <br />(ft) <br />BF -4 <br />04/29/2018 <br />24.93 <br />BF -5R <br />04/29/2018 <br />30.85 <br />BF -6 <br />04/29/2018 <br />30.85 <br />M-6 <br />04/29/2018 <br />DRY <br />M-7 <br />04/29/2018 <br />DRY <br />M-8 <br />04/29/2018 <br />DRY <br />M-9 <br />04/29/2018 <br />141.52 <br />M-10 <br />04/29/2018 <br />25.42 <br />M-1 l R <br />04/29/2018 <br />39.56 <br />M-12 <br />04/29/2018 <br />175.08 <br />M -13R <br />04/29/2018 <br />126.05 <br />M-14 <br />04/29/2018 <br />130.95 <br />M-15 <br />04/29/201 8 <br />92.10 <br />M-16 <br />0412912018 <br />22.99 <br />M-17 <br />04/2912018 <br />30.57 <br />M-18 <br />04;'29,x2018 <br />26.27 <br />M-19 <br />04.-29.-'2018 <br />23.16 <br />