2010-06-30_REPORT - C1980007 (7)

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Spring WCC-24 Water Quality and Field Parameters is • Mountain Coal West Elk Mine Monitoring Location: Spring WCC-24 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5 5/8/2009 6/3/2009 Q 4 8/11/2009 Field Parameters Flow m 6.12 40.85 23.36 19.2 26.4 42.86 Electrical Conductivity mhos/cm 1778 3240 2319 1895 1951 1869 H SU 7.3 8.64 8.05 8.37 8.36 8.23 Temperature °C 11.4 19.0 13.10 11.8 12.2 10.9 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-02 Sample Date 6/3/2009 Lab Test Date 6/4-6/16 Sam led B PH a ml y o u a 3 mg/ 323 406 368 335 Aluminum, dissolved m /I -0.03 0.04 0.02 -0.03 U Aluminum, total m /l Anions me /I 22.5 25.3 24.2 22.3 Arsenic, dissolved m /I Arsenic, total m /I 0.00079 0.0086 0.0070 0.0079 Bicarbonate m /I 321 406 364 300 Boron, dissolved m /l 0.74 0.86 0.79 0.86 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, total m /l Calcium, dissolved m /I 165 197 180 185 Carbonate m /I -2 16 4 35 Cation - Anion Balance % -2 2 -0.2 4.9 Cations me /I 23.2 25.8 24.2 24.6 Chloride m /I 2 4 3 2 B Conductivity mhos/Cm 1710 2070 1925 1940 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 856 969 905 931 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I -0.02 0.07 0.03 -0.02 U Iron, total m /I -0.02 0.53 0.20 -0.02 U Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 106 116 111 114 Manganese, dissolved m /I -0.005 0.009 0.003 -0.005 U Manganese, total m /I -0.005 0.053 0.012 -0.005 U Mercury, total m /l -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 0.02 0.01 -0.01 U Nitrate as N m /I Nitrate/Nitrite as N m /I 2.39 2.97 2.62 2.45 Nitrite as N m /I H SU 8.1 8.4 8.2 8.5 H Phosphate m /I 0.12 0.34 0.24 0.21 Phosphorus Orth0 , dissolved m /I 0.04 0.11 0.08 0.07 Potassium, dissolved m /I 22.9 26.9 25.0 24.7 Selenium, dissolved m /I Selenium, total recoverable m /I 0.014 0.019 0.016 0.0200 Sodium Absorption Ratio. SAR calc. 1.71 1.85 1.81 1.76 Sodium, dissolved m /I 116 131 123 122 Sulfate m /I 760 820 800 740 TDS Ratio calc. 1.04 1.11 1.07 1.14 TDS Calc. m /I 1380 1530 1465 1400 TDS m /I 1460 1630 1561 16001 1 TSS m /1 -5 48 12 5 B Zinc, dissolved m /I -0.01 0.03 0.02 0.01 B Zinc, total mg/I 1 Baseline 2006 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). 5 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine E-31 2009 Annual Hydrology Report HydroGeo, Inc.