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Lick Creek Flume <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />'9onitoring Location: Lick Creek Flume <br />Baseline <br />2015 Water Year <br />Description Units <br />Minimum <br />Maximum <br />Mean 4/24/2015 <br />5/28/2015 <br />5/28/2015 <br />Q4 (duplicate) Q° <br />8/19/2015 <br />Field Parameters <br />Flow staff gage <br />0.05' <br />0.45' <br />0.005' <br />Conductivity (Field) µmhos/cm <br />244 <br />140.1 <br />459 <br />H Field SU <br />1 <br />8.39 1 <br />8.15 <br />1 1 <br />8.49 <br />Temperature Field °C <br />6.3 <br />6.5 <br />17.6 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />ACZ <br />Lab Reference # <br />L24635-06 <br />L24635-03 <br />Sample Date <br />5/28/2015 <br />5/28/2015 <br />Lab Test Date <br />6/2-6/11 <br />6/2-6/11 <br />Sampled By <br />PH <br />PH <br />Aluminum, dissolved m /L <br />0.12 <br />0.12 <br />012 <br />Arsenic, dissolved m /L <br />0.001 <br />0.001 <br />0 001 <br />Bicarbonate as CaCO3 m /L <br />56 <br />229 <br />111 <br />Calcium, dissolved m /L <br />25.5 <br />25.5 <br />25.5 <br />Chloride m /L <br />8 <br />4 <br />Conductivity @25C µm os cm <br />118 <br />481 <br />238 <br />141 <br />142 <br />Hardness as CaCO3 m /L <br />45 <br />169 <br />87 <br />Iron, dissolved m /L <br />1 <br />0.56 <br />0.13 1 <br />003 <br />B 0.2 <br />Iron, total m /L <br />0.49 <br />11.3 <br />4.06 <br />2.93 <br />2.80 <br />Magnesium, dissolved m /L <br />5.3 <br />6.9 <br />6.1 <br />Manganese, dissolved m /L <br />0 007 <br />0.015 <br />0.012 <br />,Manganese, total m /L <br />0 003 <br />0.39 <br />Oil <br />Mol bdenum, dissolved m /L <br />0.01 <br />0.005 <br />' litrate/Nitrite as N m /L <br />0.13 <br />0.04 <br />i SU <br />7.1 <br />8.75 <br />785 <br />8.3 <br />H 8.3 H <br />Phosphorus, ortho dissolved m /L <br />1.67 <br />019 <br />Sodium Adsorption Ratio (SAR) calc. <br />0.59 <br />1.08 <br />086 <br />Sodium, dissolved m /L <br />23.6 <br />23.6 <br />23.6 <br />Sulfate m /L <br />8.5 1 <br />47.2 <br />21.03 <br />Residue, Filterable TDS 180C m /L <br />90 <br />552 <br />169 <br />94 <br />78 <br />Residue, Non -Filterable (TSS) 105 mg/L 1 <br />4 1 <br />614 <br />157 1 1 <br />72 <br />89 <br />Baseline and WY 2000 data adapted from WWE (2001) <br />2 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 is an estimated <br />quantity. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-3 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />