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Deer Creek <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Deer Creek <br />Baseline <br />2015 Water Year <br />Description <br />Units <br />Minimum <br />Maximum <br />Mean 5 4/24/2015 5/25/2015 8/19/2015 <br />Field Parameters <br />Flow <br />9pm <br />0.72 <br />114 <br />44.7 dry dry dry <br />Conductivity (Field) <br />µmhos/cm <br />537 <br />796 <br />659 <br />H Field <br />SU <br />8.3 <br />8.4 <br />84 <br />Temperature Field <br />°C <br />11.2 <br />169 <br />131 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity Total CaCO3 <br />m /L <br />247 <br />274 <br />263 <br />Aluminum, dissolved <br />m /L <br />-003 <br />-0.03 <br />-0.03 <br />Sum of Anions <br />me /L <br />5.6 <br />6.2 <br />5.9 <br />Arsenic, dissolved <br />m /L <br />-00005 <br />-0.0005 <br />-0.0005 <br />Arsenic, total recoverable <br />m /L <br />-0.0005 <br />00009 <br />0.0006 <br />Bicarbonate as CaCO3 <br />m /L <br />218 <br />249 <br />235 <br />Boron, dissolved <br />m /L <br />0.03 <br />0.03 <br />0.03 <br />Cadmium, dissolved <br />m /L <br />-0.005 <br />-0.005 <br />-0.005 <br />Calcium, dissolved <br />m /L <br />47.0 <br />645 <br />565 <br />Carbonate as CaCO3 <br />m /L <br />25 <br />30 <br />28 <br />Cation - Anion Balance <br />% <br />-5.7 <br />4.6 <br />3.7 <br />Sum of Cations <br />me /L <br />5.0 <br />6.8 <br />5.9 <br />Chloride <br />m /L <br />3 <br />3 <br />3 <br />Conductivity @25C <br />µmhos/cm <br />487 <br />547 <br />517 <br />Copper, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Hardness as CaCO3 <br />m /L <br />176 <br />245 <br />211 <br />Hydroxide as CaCO3 <br />m /L <br />-2 <br />-2 <br />-2 <br />Iron, dissolved <br />m /L <br />0.09 <br />Oil <br />010 <br />Iron, total <br />m /L <br />036 <br />292 <br />164 <br />Lead, dissolved <br />m /L <br />-0.04 <br />-004 <br />-0.04 <br />Magnesium, dissolved <br />m /L <br />143 <br />20.4 <br />18.3 <br />Manganese, dissolved <br />m /L <br />-0.005 <br />0 009 <br />0.005 <br />Manganese, total <br />m /L <br />-0.005 <br />0.049 <br />0.026 <br />Mercury, total <br />m /L <br />-0.0002 <br />-0.0002 <br />-0.0002 <br />Molybdenum, dissolved <br />m /L <br />-0.01 <br />-0.01 <br />-0.01 <br />Nitrate/Nitrite as N <br />m /L <br />0.88 <br />2.07 <br />150 <br />H <br />SU <br />8.5 <br />8.6 <br />8.6 <br />Phosphate <br />m /L <br />0.03 <br />0.12 <br />0.08 <br />Phosphorus, ortho dissolved <br />m /L <br />0.01 <br />0.04 <br />0.03 <br />Potassium, dissolved <br />m /L <br />3.2 <br />3.6 <br />3.4 <br />Selenium, total recoverable <br />m /L <br />-0.001 <br />-0.001 <br />-0001 <br />Sodium Adsorption Ratio(SART <br />calc. <br />1.09 <br />121 <br />1 15 <br />Sodium, dissolved <br />m /L <br />32.8 <br />43.9 <br />39.9 <br />Sulfate <br />m /L <br />30 <br />50 <br />40 <br />TDS ratio - measured/calculated <br />m /L <br />0.92 <br />0.96 <br />0.94 <br />TDS calculated <br />calc. <br />292 <br />346 <br />319 <br />Residue, Filterable TDS 180C <br />m /L <br />280 <br />330 <br />310 <br />Residue, Non -Filterable TSS 105C <br />m /L <br />16 <br />68 <br />42 <br />Zinc, dissolved <br />m /L <br />-0.01 <br />0.02 <br />0.01 <br />Baseline 2005. <br />z Negative values denote readings below lab detection levels. <br />West Elk Mine <br />B-2 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />