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Upper Dry Fork Flume <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Upper Dry Fork Flume <br />Baseline <br />2015 Water Year <br />Description <br />Units <br />Minimum <br />Maximum <br />Means 4/23/2015 <br />5/27/2015 Q4 <br />8/19/2015 <br />Field Parameters <br />Flow <br />staff gage <br />0.08' <br />0.58' <br />0 28' <br />0.25' <br />0.87' <br />0.44' <br />Conductivity (Field) <br />µmhos/cm <br />114 <br />699 <br />310 <br />93.4 <br />80.6 <br />56.8 <br />H Field <br />SU <br />7.01 <br />8.42 <br />7.76 <br />8.33 <br />8.26 <br />7.95 <br />Temperature Field <br />°C <br />11.9 <br />160 <br />135 <br />5.7 <br />11.5 <br />14.2 <br />'Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />Lab Reference # <br />L24636-04 <br />Sample Date <br />5/27/2015 <br />Lab Test Date <br />6/2-6/11 <br />Sampled By <br />PH <br />Alkalinity Total CaCO3 <br />m /L <br />24 <br />100 <br />57 <br />Aluminum, dissolved <br />m /L <br />0.04 <br />0.34 <br />0.13 <br />Sum of Anions <br />me /L <br />0.5 <br />2.2 <br />1.4 <br />Arsenic, total recoverable <br />m /L <br />0.0005 <br />0.0012 <br />0.0008 <br />Bicarbonate as CaCO3 <br />m /L <br />24 <br />100 <br />57 <br />Boron, dissolved <br />m /L <br />-001 <br />-0.01 <br />-0.01 <br />Cadmium, dissolved <br />m /L <br />-0.005 <br />-0.005 <br />-0.005 <br />Calcium, dissolved <br />m /L <br />4.6 <br />20.1 <br />11.5 <br />Carbonate as CaCO3 <br />m /L <br />-2 <br />-2 <br />-2 <br />Cation - Anion Balance <br />% <br />-11.1 <br />4.3 <br />-5.2 <br />Sum of Cations <br />me /L <br />0.4 <br />2.4 <br />1.3 <br />Chloride <br />m /L <br />1 <br />8 <br />3 <br />Conductivity @25C <br />µm os Cm <br />47 <br />246 <br />135 <br />83.2 <br />'Copper, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Hardness as CaCO3 <br />m /L <br />16 <br />67 <br />39 <br />Hydroxide as CaCO3 <br />m /L <br />-2 <br />-2 <br />-2 <br />Iron, dissolved <br />m /L <br />0.06 <br />0.32 <br />0.20 <br />003 B <br />Iron, total <br />m /L <br />1.70 <br />3.64 <br />2.75 <br />4.53 <br />Lead, dissolved <br />m /L <br />-0.04 <br />-0.04 <br />-004 <br />Magnesium, dissolved <br />m /L <br />1.1 <br />4.0 <br />2.4 <br />Manganese, dissolved <br />m /L <br />0.007 <br />0.035 <br />0.017 <br />Manganese, total <br />m /L <br />0.047 <br />0.103 <br />0.078 <br />Mercury, total <br />m /L <br />-0.0002 <br />-0.0002 <br />-00002 <br />Molybdenum, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Nitrate/Nitrite as N <br />m /L <br />-0.02 <br />0.15 <br />0.04 <br />H <br />SU <br />7.8 <br />8.2 <br />8.0 <br />8.1 H <br />Phosphate <br />m /L <br />0.06 <br />0.12 <br />0.08 <br />Phosphorus, ortho dissolved <br />m /L <br />002 <br />0.04 <br />0.03 <br />Potassium, dissolved <br />m /L <br />-03 <br />1.1 <br />06 <br />Selenium, total recoverable <br />m /L <br />-0.001 <br />-0.001 <br />-0001 <br />Sodium Adsorption Ratio (SAR) <br />calc. <br />0.20 <br />1.36 <br />0.80 <br />Sodium, dissolved <br />m /L <br />1.9 <br />25.2 <br />12.5 <br />Sulfate <br />m /L <br />-10 <br />20 <br />3 <br />TDS ratio - measured/calculated <br />m /L <br />1.22 <br />1.74 <br />1.52 <br />TDS calculated <br />calc. <br />23 <br />123 <br />73 <br />Residue, Filterable TDS 180C <br />m /L <br />40 <br />160 <br />105 <br />70 <br />Residue, Non -Filterable TSS 105C <br />m /L <br />24 <br />88 <br />42 <br />127 <br />inc, dissolved <br />mg/L <br />0.01 <br />0.02 <br />0.02 <br />Baseline 2006. <br />Negative values denote readings below lab detection levels. <br />3 ACZ Laboratory, Steamboat Springs, CO. <br />ACZ Lab Qualifiers: U - Anatyte was analyzed for but not detected at the indicated MDL. <br />Sulfate <br />B -Analyte conc detected ata value between method detection limit (MDL) and practical quantitation limit (PQL) The associated value is an estimated <br />quantity. <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 limit. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-10 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />