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• <br />West Elk Mine 2009 Annual Hydrology Report <br />iv <br />4.3.2 Ponds MB-3, MB-4, and MB-5 .............................................................. 38 <br />4.3.3 Pond FW-1 .............................................................................................. 39 <br />4.3.4 RPE Pond and NSSA Pond .................................................................... 39 <br />4.3.5 Pond SG-1 .............................................................................................. 39 <br />4.3.6 Mine Water Polishing Pond .................................................................... 39 <br />4.3.7 WWTP Polishing Pond ........................................................................... 39 <br />4.4 Mine Water Inflows ............................................................................................. 39 <br />4.4.1 NW Panels Sealed Sump ........................................................................ 39 <br />4.4.2 NE Panels Sealed Sump ......................................................................... 39 <br />4.5 Colorado Department of Public Health and Environment, Colorado Discharge <br />Permit System (CDPS) Summary ........................................................................ 40 <br />• <br />4.5.1 CDPS Permit CO-0038776 ..................................................................... 40 <br />4.5.1.1 Outfall 007 Amendments ........................................................... 40 <br />4.5.1.2 Outfall 017 Amendments ........................................................... 40 <br />4.5.1.3 Bio-Monitoring Testing for Toxicity ......................................... 40 <br />4.5.2 Sanitary Wastewater ............................................................................... 41 <br />4.5.3 Sedimentation Ponds .............................................................................. 41 <br />4.6 Permit Compliance .............................................................................................. 43 <br />4.6.1.1 Outfall 007 (Waste Water Treatment Pond (WWTP) ............... 43 <br />4.6.1.2 Outfalls 005, 008, and 009 ......................................................... 43 <br />4.6.1.3 Outfall014 .................................................................................43 <br />4.6.1.4 Outfall015 .................................................................................44 <br />4.6.1.1 Outfalls 016 and 004 .................................................................. 44 <br />4.6.1.2 Outfalls 011, 012, 013, 017,018 and 019 ................................... 44 <br />5.0 ASSESSMENT OF MINE-INDUCED HYDROLOGIC IMPACTS AND ANTICIPATED <br />IMPACTS IN WY 2010 .......................................................................................................... 47 <br />5.1 Surface Water ...................................................................................................... 47 <br />5.1.1 Impacts to Area Stream Water Quality ................................................... 47 <br />5.1.2 Impacts to Area Stream Water Quantity ................................................. 51 <br />5.1.3 Impacts to the North Fork of the Gunnison River .................................. 51 <br />5.1.3.1 Salinity 52 <br />• <br />June 2010 <br />HydroGeo, Inc.