2013-07-02_REPORT - C1980007 (3)

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West Elk Mine 2012 Annual Hydrology Report iv 4.5 Colorado Department of Public Health and Environment, Colorado Discharge Permit System (CDPS) Summary ................ .............................42 4.5.1 CDPS Permit CO- 0038776 ............................... .............................42 4.5.1.1 Outfall 007 Amendments ................ .............................42 4.5.1.2 Outfal1 01 7 Amendments ................ .............................42 4.5.1.3 Bio- Monitoring Testing for Toxicity ...........................42 4.5.2 Sanitary Wastewater ......................................... .............................43 4.5.3 Sedimentation Ponds ......................................... .............................43 4.6 Permit Compliance ........................................................ .............................44 4.6.1 Outfall 007 (Waste Water Treatment Pond (WWTP) ....................47 4.6.2 Outfalls 005, 008, and 009 ................................ .............................47 4.6.3 Outfall 014 ........................................................ .............................48 4.6.4 Outfall 015 ........................................................ .............................48 4.6.5 Outfall 004 ........................................................ .............................48 4.6.6 Outfalls 011, 012, 013, 016, 017,018 and 019 .. .............................48 5.0 ASSESSMENT OF MINE - INDUCED HYDROLOGIC IMPACTS AND ANTICIPATED IMPACTS IN WY 2013 ................................ .............................49 5.1 Surface Water ................................................................ .............................49 5.1.1 Impacts to Area Stream Water Quality ............. .............................49 5.1.2 Impacts to Area Stream Water Quantity ........... .............................51 5.1.3 Impacts to the North Fork of the Gunnison River .........................51 5.1.3.1 Salinity ............................................ .............................52 5.2 Springs and Seeps ......................................................... .............................53 5.2.1 Impacts to Spring and Seep Water Quality ....... .............................53 5.2.2 Impacts to Spring and Seep Water Quantity ..... .............................54 5.3 Stock Ponds and USFS Water Resources ..................... .............................55 5.4 Groundwater ................................................................. .............................55 5.4.1 Impacts to Groundwater Quality ....................... .............................56 5.4.2 Impacts to Groundwater Quantity ..................... .............................57 6.0 ADEQUACY OF THE MONITORING PROGRAM .............. .............................60 6.1 Mining Related Hydrologic Impacts ............................. .............................60 7.0 SUMMARY .............................................................................. .............................61 8.0 REFERENCES ......................................................................... .............................63 LIST OF MAPS Map 1 E -Seam Mine Water Inflows Water Year 2012 ....... .............................In Folder Map 2 Locations of Hydrologic Monitoring Stations ......... .............................In Folder June 2013 HVdroGeo, Inc.