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Lower Dry Fork Flume <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Lower Dry Fork Flume <br />Baseline <br />2015 Water Year <br />Description Units <br />Minimum <br />Maximum <br />Mean <br />4/25/2015 <br />5/25/2015 Q <br />8/19/2015 <br />Field Parameters <br />Flow staff gage <br />0.06' <br />0.11' <br />0.35' <br />Conductivity (Field) µmhos/cm <br />1,500 <br />984 <br />330 <br />H (Field) SU 1 <br />8.75 <br />1 9.03 <br />8.62 <br />Temperature (Field) UC <br />7.3 <br />10.8 <br />11.7 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />Lab Reference # <br />L24596-05 <br />Sample Date <br />5/25/2015 <br />Lab Test Date <br />5/29-6/6 <br />Sampled By <br />PH <br />Bicarbonate as CaCO3 m /L <br />118 <br />324 <br />220 <br />Calcium, dissolved m /L <br />879 <br />87.9 <br />879 <br />Chloride m /L <br />8.4 <br />42 <br />Conductivity @25C pm os cm <br />207 <br />1,920 <br />755 <br />958 <br />Hardness as CaCO3 m /L <br />125 <br />726 <br />360 <br />Iron, dissolved m /L <br />0.178 <br />0.049 <br />0.04 B <br />Iron, total m /L <br />002 <br />84 <br />5.6 <br />3.0 <br />Magnesium, dissolved m /L <br />9.8 <br />49 <br />29 <br />Manganese, dissolved m /L <br />0.008 <br />0.013 <br />0.011 <br />Manganese, total m /L <br />46.4 <br />1.4 <br />Nitrate/Nitrite as N m /L <br />0.1 <br />0.3 <br />0.2 <br />H SU <br />6.9 <br />9 <br />8.2 <br />8.7 H <br />Phosphorus, ortho dissolved m /L <br />0.763 <br />0.048 <br />Sodium Adsorption Ratio (SAR) calc. <br />0.71 <br />1 48 <br />1.11 <br />Sodium, dissolved m /L <br />69 <br />69 <br />69 <br />Sulfate m /L <br />35 <br />613 <br />249 <br />Residue, Filterable (TDS) 2180C m /L <br />158 <br />1,388 <br />581 <br />666 <br />Residue, Non -Filterable (T S) al05C mg/L <br />12 <br />1,098 <br />144 <br />58 <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 />4 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 <br />an estimated quantity. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-4 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />