2009-07-01_REPORT - C1980007 (8)

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Spring 15-1 Water Quality and Field Parameters C • Mountain Coal West Elk Mine Monitoring Location Spring 15-1 Baseline' 2008 Water Year Description Units Minimum Maximum Mean 5/9/2008 6/6/2008 8/23/2008 Field Parameters Flow m Seep Seep Dry Electrical Conductivity pmhos/cm 1060 1240 1137 1476 1396 H SU 7.4 8.6 8.2 7.62 8.41 Temperature (°C) °C 1.1 12.8 8 14.9 28.2 Comment Laboratory Parameters' Name of Certified Labe Enviro-Chem Lab Reference # 08/918 Sample Date 6/6/2008 Lab Test Date 6/9-7/3 Sampled B P. Holder Alkalinity (Total CaC03) mg/I 375 520 480 Aluminum, dissolved m /I Anions me /I 0.5 0.09 Arsenic, dissolved m /l Arsenic, total m /I 0.001 0.001 Bicarbonate m /I 364 520 477 Boron, dissolved m /I Cadmium, dissolved m /I 0.004 0.0005 Calcium, total m /I 0.004 0.0005 Calcium, dissolved m /I 44.9 67.8 58.3 Carbonate m /I 12 2.2 Cation - Anion Balance m /I -5.8 3.8 -1 Cations me /I 12.1 14.4 13.3 Chloride m /I 4 9 6.3 Conductivity pmhos/cm 1080 1120 1100 1302 Copper, dissolved m /I 0.01 0.01 Hardness m /I 222 307 271 Hydroxide m /I Iron, dissolved m /I 0.01 0.01 0.03 Iron, total m /I 0.01 0.73 0.12 0.64 Lead, dissolved m /I Magnesium, dissolved m /I 25.8 33.4 30 Manganese, dissolved m /I Manganese, total m /I 0.022 0.001 Mercury, total m /I Molybdenum, dissolved m /I 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 8.51 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 calc. 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 660 730 701 996 TSS m /I 26 s 2 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 Enviro-Chem Analytical, Grand Junction, CO West Elk Mine E-17 2008 Annual Hydrology Report HydroGeo, Inc.