2016-12-01_PERMIT FILE - C1980007 (6)

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Deep Creek Ditch WY 2015 Surface Water Quality and Field Parameters Mountain Coal West Elk Mine Monitoring Location: Deep Creek Ditch Baseline 2015 Water Year Description Units Minimum Maximum Mean 5 4/23/2015 5/27/2015 Q4 8/19/2015 Field Parameters Flow gpm / staff 6977 152727 56269 0 18' 0 46' 0 29' Conductivity (Field) µmhos/cm 759 928 316 81 1 709 497 H (Field) SU 632 820 727 810 857 825 Temperature Field °C 50 119 96 48 101 1 127 Comment Laboratory Parameters Name of Certified Lab 3 ACZ Lab Reference # L24636-02 Sample Date 5/27/2015 Lab Test Date 6/2-6/11 Sampled By PH Alkalinity (Total CaCO3) m /L 25 60 45 Aluminum, dissolved m /L 005 015 010 Sum of Anions meq/L 05 14 09 Arsenic, total recoverable m /L -00005 00006 00003 Bicarbonate as CaCO3 m /L 25 60 45 Boron, dissolved m /L -001 -001 -001 Cadmium, dissolved m /L -0005 -0005 -0005 Calcium, dissolved m /L 46 137 101 Carbonate as CaCO3 m /L -2 -2 -2 Cation -Anion Balance % -11 1 67 -30 Sum of Cations me /L 04 1 1 2 09 Chloride m /L 1 9 3 Conductivity @25C µmhos/cm 50 113 88 732 Copper, dissolved m /L -001 -001 -001 Hardness as CaCO3 m /L 16 47 35 Hydroxide as CaCO3 m /L -2 -2 -2 Iron, dissolved m /L 004 014 009 005 Iron, total m /L 1 19 259 1 83 270 Lead, dissolved m /L -004 -004 -004 Magnesium, dissolved m /L 1 1 3 1 23 Manganese, dissolved m /L -0005 0 013 0 005 Manganese, total m /L 0 032 0 090 0 064 Mercury, total m /L -00002 -00002 -00002 Molybdenum, dissolved m /L -001 -001 -001 Nitrate/Nitrite as N) m /L -002 339 090 H SU 78 81 80 81 H Phosphate m /L 006 009 008 Phosphorus, ortho dissolved m /L 002 003 003 Potassium, dissolved m /L -03 07 05 Selenium, total recoverable m /L -0.001 -0001 -0001 Sodium Adsorption Ratio (SAR) calc. 019 033 028 Sodium, dissolved m /L 1 8 52 39 Sulfate m /L -10 -10 -10 TDS ratio - measured/calculated m /L 138 205 164 TDS (calculated) calc 24 68 47 Residue, Filterable (TDS 180C m /L 40 100 75 54 Residue, Non -Filterable TSS 105C m /L 8 76 32 71 Zinc, dissolved mg/L -001 003 002 Baseline 2006 2 Negative values denote readings below lab detection levels 3 ACZ Laboratory, Steamboat Springs, CO ° ACZ Lab Qualifiers U - Analyte was analyzed for but not detected at the indicated MDL Sulfate B - Analyte conc detected at a value between method detection limit (MDL) and practical quantitation limit (PQL) The associated value is an estimated quantity 5 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value West Elk Mine B-1 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc.