2008-06-27_REPORT - C1980007 (6)

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Spring 15-1 Water Quality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location Spring 15-1 Baseline 2007 Water Year Description Units Minimum Maximum Mean 4/26/2007 5130/2007 8/2212007 Field Parameters Flow m Wet Wet D Electrical Conductivity µmhos/cm 1060 1240 1137 1407 H SU 7.4 .8.6 8.2 8.45 Temperature (°F) OF 58.1 Temperature (°C) °C 1.1 12.8 8 14.5 Comment Laboratory Parameters Name of Certified Lab Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity (Total CaCO3) mg/I 375 520 480 Aluminum, dissolved m /I Anions me /I 0.5 0.09 Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 Bicarbonate m /l 364 520 477 Boron, dissolved m /l Cadmium, dissolved m /l 0.004 0.0005 Calcium, total m /l 0.004 0.0005 Calcium, dissolved m /l 44.9 67.8 58.3 Carbonate m /l 12 2.2 Cation - Anion Balance m /l -5.8 3.8 -1 Cations me /1 12.1 14.4 13.3 Chloride m /I 4 9 6.3 Conductivity µmhos/cm 1080 1120 1100 Copper, dissolved m /I 0.01 0.01 Hardness m /I 222 307 271 Hydroxide m /l Iron, dissolved m /I 0.01 0.01 Iron, total m /I 0.01 0.73 0.12 Lead, dissolved m /I Magnesium, dissolved m /I 25.8 33.4 30 Manganese, dissolved m /I Manganese, total m /l 0.022 0.001 Mercury, total m /l Molybdenum, dissolved m /l Nitrate as N m /I Nitrate/Nitrite as N m /I 0.08 0.18 0.11 Nitrite as N m /I H SU 7.9 8.2 8.1 Phosphate m /I Phosphorus Ortho , dissolved m /I 0.009 0.001 Potassium, dissolved m /I 2.8 3.2 3 Selenium, total m /I 0.002 0.001 Sodium Absorption Ratio SAR talc. 4.61 5.39 4.99 Sodium, dissolved m /I 163 200 185 Sulfate m /I 140 180 151 TDS Ratio calc. TDS Calc. m /I TDS m /I 660 730 701 TSS m /I 26 9 Zinc, dissolved m /I 0.01 0.01 Zinc, total mg/I 0.05 0.02 Baseline pre -2000 data, adapted from WWE (2001) 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels E-17 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.