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West Elk Mine 2004 Annual Hydrology Report 32 <br />. Inflows (water entering the mine) include: <br />• Raw water intake (North Fork diversion, 469 ac-ft) <br />• Mine Inflows (faults, coal outcrops, and drips, 166 ac-ft) <br />• Total Inflow = 635 ac-ft <br />Outflows (water exiting the mine) include: <br />• Water in produced coal and GOB (150 ac-ft) <br />• Mine sump discharge and drilling water (324 ac-ft) <br />• Mine ventilation moisture (50 ac-ft) <br />• Miscellaneous mine seepage and evaporation (20 ac-ft) <br />• Pond evaporation (22 ac-ft) <br />• Runoff from surface operations\pond discharge (84 ac-ft) <br />• Total Outflow = 650 ac-ft <br />The total volume of water entering the mine during WY2003 was 635 ac-ft versus a total outflow <br />of 650 ac-ft, a net difference of +15 ac-ft (surface operations discharge). <br />5.0 ASSESSMENT OF MINE-INDUCED HYDROLOGIC IMPACTS AND <br />ANTICIPATED IMPACT IN WY 2005 <br />• 5.1 Surface Water <br />MCC maintains a network of 17 stream flow gaging stations throughout the permit and lease areas <br />(Table 2). The locations of the stations are shown on Map 2. Daily mean flow summary tables aze <br />presented in Appendix A. Stream hydrographs are presented in Appendix B and water quality <br />hydrographs are presented in Appendix C. <br />5.1.1 Impacts to Area Stream Water Quantity and Quality <br />Mining activity has approached only two perennial streams in the Project area, Minnesota Creek <br />and Deep Creek. Long wall mining operations in the Minnesota Creek drainage area took place <br />from July 1998 to February 2001. There has been longwall mining in the Deep Creek drainage <br />since Mazch 2001. Based on water quality and flow monitoring data (see Appendices A, B, and C), <br />there have been no apparent mining induced impacts to the water quality or quantity of these <br />streams. <br />It is important to note that the flow data from the Upper and Lower Deep Creek (Appendix A) <br />stations are suspect, due to the lack of flumes and channel variations. In addition, it appears that <br />the Deep Creek monitoring sites were vandalized on June I1, 2004. The Lower Deep Creek data <br />• logger was not damaged and the monitoring data was not interrupted. However, the Upper Deep <br />August 2005 HydroGeo, Inc. <br />