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Poison Gulch <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Poison Gulch <br />Baseline <br />2015 Water Year <br />Description <br />Units <br />Minimum <br />Maximum <br />Mean 4/25/2015 <br />5/28/2015 Q 8/19/2015 <br />Field Parameters <br />Flow <br />9pm <br />seep <br />seep dry <br />Conductivity (Field) <br />µmhos/cm <br />550 <br />463 <br />H Field <br />SU <br />795 <br />8 10 <br />Temperature Field <br />°C <br />3.2 <br />14.7 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />Lab Reference # <br />L24635-01 <br />Sample Date <br />5/28/2015 <br />Lab Test Date <br />6/3-6/11 <br />Sampled By <br />PH <br />Alkalinity Total CaCO3 <br />m /L <br />119 <br />152 <br />136 <br />Aluminum, dissolved <br />m /L <br />-003 <br />-0.03 <br />-0.03 <br />Sum of Anions <br />me /L <br />2.4 <br />3.0 <br />2.7 <br />Arsenic, total recoverable <br />m /L <br />-00005 <br />00007 <br />00005 <br />Bicarbonate as CaCO3 <br />m /L <br />119 <br />152 <br />136 <br />Boron, dissolved <br />m /L <br />0.02 <br />0.03 <br />0.03 <br />Cadmium, dissolved <br />m /L <br />-0.005 <br />-0005 <br />-0005 <br />Calcium, dissolved <br />m /L <br />220 <br />35.5 <br />288 <br />Carbonate as CaCO3 <br />m /L <br />-2 <br />-2 <br />-2 <br />Cation - Anion Balance <br />% <br />-2.1 <br />77 <br />44 <br />Sum of Cations <br />me /L <br />2.3 <br />35 <br />2.9 <br />Chloride <br />m /L <br />1 <br />1 <br />1 <br />Conductivity @25C <br />µmhos/cm <br />240 <br />295 <br />268 <br />423 <br />Copper, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Hardness as CaCO3 <br />m /L <br />78 <br />124 <br />101 <br />Hydroxide as CaCO3 <br />m /L <br />-2 <br />-2 <br />-2 <br />Iron, dissolved <br />m /L <br />0.07 <br />0.11 <br />0.09 <br />002 B <br />Iron, total <br />m /L <br />0.41 <br />0.43 <br />0.42 <br />0.1 <br />Lead, dissolved <br />m /L <br />-0.04 <br />-0.04 <br />-0.04 <br />Magnesium, dissolved <br />m /L <br />5.6 <br />86 <br />7 1 <br />Manganese, dissolved <br />m /L <br />-0005 <br />-0.005 <br />-0.005 <br />Manganese, total <br />m /L <br />-0.005 <br />0.010 <br />0 006 <br />Mercury, total <br />m /L <br />-0.0002 <br />-00002 <br />-00002 <br />Molybdenum, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />H <br />SU <br />7.8 <br />81 <br />80 <br />8.3 H <br />Phosphate <br />m /L <br />0.21 <br />0.21 <br />0.21 <br />Phosphorus, ortho dissolved <br />m /L <br />0.07 <br />0.07 <br />0.07 <br />Potassium, dissolved <br />m /L <br />2.9 <br />2.9 <br />2.9 <br />Selenium, total recoverable <br />m /L <br />-0.001 <br />-0.001 <br />-0.001 <br />Sodium Adsorption Ratio (SAR) <br />calc <br />0.82 <br />0.92 <br />0.87 <br />Sodium, dissolved <br />m /L <br />16.6 <br />23.3 <br />20.0 <br />Sulfate <br />m /L <br />-10 <br />-10 <br />-10 <br />TDS ratio - measured/calculated <br />m /L <br />1.04 <br />1.08 <br />1 06 <br />TDS calculated <br />calc. <br />120 <br />163 <br />1 142 <br />Residue, Filterable TDS 180C <br />m /L <br />130 <br />170 <br />1 150 <br />246 <br />Residue, Non -Filterable TSS 105C <br />m /L <br />-5 <br />28 <br />15 <br />6 B <br />Zinc, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Baseline 2005. <br />Negative values denote readings below lab detection levels. <br />3 ACZ Laboratory, Steamboat Springs, CO <br />ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />Sulfate <br />5 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection <br />limit. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-7 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />