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Lower North Fork <br />Surface Water Quality and Field Parameters <br />• <br />• <br />C-2 <br />Mountain Coal West Elk Mine <br />Monitoring Location N. Fork Lower Baseline 2009 Water Year <br />Description Units Minimum Maximum mean 5/7/2009 6/2/2009 Q ° 8/10/2009 Q ° <br />Field Parameters <br />Flow cfs N/A N/A N/A <br />Electrical Conductivity umhos/cm 129 110 181 <br />H SU 8.44 8.29 8.53 <br />Temperature (°C) °C 10.3 15.1 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab R ACZ <br />Lab Reference # L77413-10 <br />Sample Date 6/2/2009 8/10/2009 <br />Lab Test Date 8/11-8/24 <br />Sampled B PH PH <br />Alkalinity Total CaC03 m /I 44 74 <br />Aluminum, dissolved m /I -0.03 U -0.03 U <br />Anions me /1 1.0 1.5 <br />Arsenic, total m /I -0.0005 U -0.0005 U <br />Bicarbonate m /I 41 138 78 44 73 <br />Boron, dissolved m /I -0.01 U -0.01 U <br />Cadmium, dissolved M Q/1 -0.005 U -0.005 U <br />Calcium, dissolved m /I 12.9 18.5 <br />Carbonate m /I -2 U -2 U <br />Cation - Anion Balance % -5.3 -3.4 <br />Cations me /I 0.9 1.4 <br />Chloride m /I 1.6 8 3.8 1 B 1 B <br />Chromium, total m /I -0.01 U -0.01 U <br />Conductivity umhos/cm 95 150 <br />Copper, dissolved m /I -0.01 U -0.01 U <br />Cyanide, total m /I -0.003 U 0.005 B <br />Hardness m /I 39.3 109 68.7 41 59 <br />Hydroxide m /I -2 u -2 U <br />Iron, dissolved m /l 0.126 0.065 0.02 B -0.02 U <br />Iron, total m /I 0.09 3.8 0.92 1.34 0.63 <br />Lead, dissolved m /I -0.04 U -0.04 U <br />Magnesium, dissolved m /l 2.0 3.1 <br />Manganese, dissolved m /I 0.0002 0.05 0.01 -0.005 U -0.005 U <br />Manganese, total m /I 0.024 B 0.014 B <br />Mercury, total m /I -0.0002 U -0.0002 U <br />Molybdenum, dissolved m /I -0.01 U -0.01 U <br />Nickel, Total m /I -0.01 u -0.01 U <br />Nitrate/Nitrite as N m /l 0.08 B -0.02 U <br />H lab SU 7 8.8 8.1 8.1 H 8.4 H <br />Phosphate m /I -0.03 U 0.06 B <br />Phosphorus OrthO , dissolved m /I 2.74 0.25 -0.01 UH 0.02 B <br />Potassium, dissolved m /I 0.6 B 0.7 B <br />Selenium, total m /I 0.0002 B 0.0002 B <br />Silver, total m /I -0.00005 U -0.00005 U <br />Sodium Absorption Ratio SAR Cale. 0.23 0.34 <br />Sodium, dissolved m /I 3.4 6.0 <br />Sulfate m /I 4 25 12 5 B 5 B <br />TDS Ratio Cale. 1.37 1.28 <br />TDS Calc. m /I 51 78 <br />TDS m /I 36 180 101 70 100 <br />TSS m /I 6.4 107 36 7 8 6 B <br />Zinc, dissolved mg/I 0.11 0.04 B <br />' Baseline and WY 2000 data adapted from WWE (2001). <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels. <br />e 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 cone detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />2009 Annual Hydrology Report HydroGeo, Inc.