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Upper Deep Creek <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Upper Deep Creek <br />Baseline <br />2015 Water Year <br />Description <br />Units <br />Minimum <br />Maximum <br />Mean 4/23/2015 5/27/2015 Q4 8/19/2015 <br />Field Parameters <br />Flow <br />9pm <br />801 <br />2,568 132 <br />Conductivity (Field) <br />µmhos/cm <br />80 <br />310 <br />192 387 <br />272 484 <br />H Field <br />SU <br />8.10 <br />8.80 <br />8.50 7.99 <br />8.55 8.62 <br />Temperature Field <br />°C <br />0.2 <br />18.6 <br />10.0 52 <br />12.5 15.4 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />Lab Reference # <br />L24635-05 <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 />160 <br />103.4 <br />Sum of Anions <br />meq/L <br />1 5 <br />2.6 <br />21 <br />Bicarbonate as CaCO3 <br />m /L <br />53 <br />153 <br />106.3 <br />Calcium, dissolved <br />m /L <br />14 <br />44.4 <br />28.7 <br />Carbonate as CaCO3 <br />m /L <br />9 <br />1.3 <br />Cation - Anion Balance <br />% <br />-3.4 <br />-2 <br />-2.7 <br />Sum of Cations <br />me /L <br />1.4 <br />2.5 <br />2.0 <br />Chloride <br />m /L <br />2 <br />0.2 <br />Conductivity @25C <br />µm os cm <br />139 <br />242 <br />191 <br />250 <br />Hardness as CaCO3 <br />m /L <br />47 <br />138 <br />91 <br />Iron, dissolved <br />m /L <br />0.02 <br />0.04 <br />0 <br />-0.02 U <br />Iron, total <br />m /L <br />0.14 <br />9.43 <br />2.63 <br />14.30 <br />Magnesium, dissolved <br />m /L <br />2.6 <br />6.6 <br />4.6 <br />Manganese, dissolved <br />m /L <br />0.007 <br />0.004 <br />Manganese, total <br />m /L <br />0.005 <br />0 282 <br />0 <br />Nitrate/Nitrite (as N) <br />m /L <br />0.05 <br />0.01 <br />pH <br />SU <br />6.9 <br />8 <br />7.5 <br />8.4 H <br />Phosphate <br />m /L <br />0.12 <br />0.2 <br />0.16 <br />Phosphorus, ortho dissolved <br />m /L <br />0 065 <br />0.013 <br />Potassium, dissolved <br />m /L <br />07 <br />1.2 <br />1 0 <br />Sodium Adsorption Ratio (SAR) <br />calc. <br />0.32 <br />0.77 <br />0.6 <br />Sodium, dissolved <br />m /L <br />7.9 <br />20 <br />13.8 <br />Sulfate <br />m /L <br />30 <br />10.8 <br />Residue, Filterable (TDS) 9180C <br />m /L <br />60 <br />210 <br />133 <br />184 <br />Residue, Non -Filterable (TSS) 105C <br />mg/L <br />480 <br />Baseline and WY 2000 data adapted from WWE (2001). <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 />B - Analyte conc detected at a value between method detection limit (MDL) and practical quantitation limit (PQL) The associated value <br />is an estimated quantity. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-9 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />