2009-07-01_REPORT - C1980007 (8)

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Spring WCC-24 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location: Spring WCC-24 Baseline' 2008 Water Year Descri tion Units Minimum Maximum Mean" 5/5/2008 6/8/2008 Enviro- Chem MDL 8/23/2008 Field Parameters Flow m 6.12 40.85 23.36 3 1.5 69 Electrical Conductivity µmhos/cm 1778 3240 2319 1737 1683 1925 H SU 7.3 8.64 8.05 7.95 8.44 8.32 Temperature °C 11.4 19.0 13.10 13.6 8.9 14.7 Comment Laboratory Parameters 3 Name of Certified Lab Enviro-Chem Lab Reference # 08/949 Sample Date 6/8/2008 Lab Test Date 6/9-7/31 Sampled B P. Holder Alkalinity (Total CaC03) mg/I 323 406 368 248.66 2.000 Aluminum, dissolved m /I -0.03 0.04 0.02 0.277 0.01 Aluminum, total m /l Anions me /l 22.5 25.3 24.2 20.058 calc Arsenic, dissolved m /I Arsenic, total m /I 0.00079 0.0086 0.0070 0.127 0.001 Bicarbonate m /1 321 406 364 Boron, dissolved m /I 0.74 0.86 0.79 1.76 0.01 Cadmium, dissolved nigh -0.005 -0.005 -0.005 0.013 0.001 Calcium, total m /I Calcium, dissolved m /I 165 197 180 146.2 0.1 Carbonate m /I -2 16 4 Cation - Anion Balance % -2 2 -0.2 11.46 calc Cations me /1 23.2 25.8 24.2 22.655 calc Chloride m /l 2 4 3 1.76 0.1 Conductivity µmhos/cm 1710 2070 1925 1424.5 1 Copper, dissolved m /I -0.01 -0.01 -0.01 0.046 0.002 Hardness m /l 856 969 905 893.8126 talc Hydroxide m /I -2 -2 -2 Iron, dissolved m /I -0.02 0.07 0.03 0.01 0.01 Iron, total m /l -0.02 0.53 0.20 0.59 0.01 Lead, dissolved m /l -0.04 -0.04 -0.04 0.011 0.005 Magnesium, dissolved m /I 106 116 111 128.4 0.1 Manganese, dissolved m /I -0.005 0.009 0.003 0.007 0.005 Manganese, total m /I -0.005 0.053 0.012 0.02 0.005 Mercury, total m /I -0.0002 -0.0002 -0.0002 0.00004 0.000025 Molybdenum, dissolved m /I -0.01 0.02 0.01 0.0017 0.001 Nitrate as N m /I 4.94 0.13 Nitrate/Nitrite as N m /I 2.39 2.97 2.62 4.97 0.13 Nitrite as N m /I 0.03 0.01 H SU 8.1 8.4 8.2 8.27 0.1 Phosphate m /I 0.12 0.34 0.24 0 0.01 Phosphorus Ortho , dissolved m /l 0.04 0.11 0.08 Potassium, dissolved m /I 22.9 26.9 25.0 25.1 0.1 Selenium, dissolved m /I Selenium, total recoverable m /I 0.014 0.019 0.016 0.008 0.001 Sodium Absorption Ratio SAR Cale. 1.71 1.85 1.81 1.379 calc Sodium, dissolved m /I 116 131 123 94.8 0.1 Sulfate m /l 760 820 800 562.66 2 TDS Ratio calc. 1.04 1.11 1.07 10.23 talc TDS Calc. m /I 1380 1530 1465 1215.42 2 TDS m /I 1460 1630 1561 1354 2 TSS m /I -5 48 12 30 2 Zinc, dissolved m /I -0.01 0.03 0.02 0 0.005 Zinc, total mg/I ' Baseline 2006 2 Enviro-Chem Analytical, Grand Junction, CO 'Zero values denote readings below lab detection levels (MDL). Avers a mean value talc using 1/2 of detection limit for readings below lab detection limits unless all readin s are below lab detection limit s Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)]' 100 West Elk Mine E-31 2008 Annual Hydrology Report HydroGeo, Inc.