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West Elk Mine 2008 Annual Hydrology Report 51 <br />• 4.5.6 Mine Water Polishing Pond <br />Water pumped from the mine through the mine water pumping facility (MWPF) is directed to the <br />mine water polishing pond for settling prior to discharge. Once treated, the water flows to <br />Sylvester Gulch through Outfall 017A. <br />4.5.7 WWTP Polishing Pond <br />Effluent from MCC's wastewater treatment plant (WWTP) discharges to the WWTP polishing <br />pond prior to discharge. After retention in the polishing pond, the water is discharged through <br />Outfall 007A and flows to sediment pond MB-2R. <br />4.6 Mine Water Inflows <br />In WY 2008, there were no significant groundwater inflows. Minor inflows totaling 58.4 ac-ft <br />occurred in the F Seam (10 ac-ft), faults (32.26 ac-ft), and other miscellaneous groundwater <br />inflows (16.13 ac-ft) (Map IA and Map 1B, Figure 9) (MCC, 2009). Section 3.4 summarizes the <br />mine sampling protocols. <br />4.6.1 NW Panels Sealed Sump <br />• During WY 2008, MCC water from the NW Panels Sealed Sump was drained through a borehole <br />to the NE Panels Sealed Sump. There will be no further discharge from the NW Panels sealed <br />sump to the Lone Pine Pipeline, as the pipeline was removed when the Lone Pine Gulch facilities <br />area was reclaimed in 2004 (MCC, 2009). <br />4.6.2 NE Panels Sealed Sump <br />During WY 2008, water collected in the NE Panels Sealed Sump was pumped out of the sump <br />using the mine water pumping facility (MWPF), up the vertical well and discharged to Sylvester <br />Gulch. The discharge from MWPF to Sylvester Gulch was 444.61 ac-ft (Figure 9) (MCC, 2009). <br />A clarifying pond and energy dissipater system is located at this discharge point. <br />5.0 ASSESSMENT OF MINE-INDUCED HYDROLOGIC IMPACTS AND <br />ANTICIPATED IMPACTS IN WY 2009 <br />5.1 Surface Water <br />MCC maintains a network of 23 stream flow gauging stations and 8 temperature monitoring <br />stations throughout the permit and lease areas (Table 2). The locations of the surface water <br />• monitoring stations are shown on Map 2. Daily mean flow summary tables are presented in <br />Appendix A. Surface water flow hydrographs are presented in Appendix B and the field and <br />June 2009 HydroGeo, Inc.