2009-07-01_REPORT - C1980007 (8)

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Spring G-31 Water Quality and Field Parameters LJ L? Mountain Coal West Elk Mine Monitoring Location Spring G-31 Baseline' 2008 Water Year Description Units Minimum Maximum Mean 5/7/2008 619/2008 8/24/2008 Field Parameters Flow 910M N/A 6.6 Trickle Electrical Conductivity µmhos/cm 770 917 1093 H SU 7.73 8.18 8.26 Temperature (°C) °C 9.9 12.8 13.8 Comment Flow mixed with runoff from above Laboratory Parameters' Name of Certified Lab Enviro-Chem Lab Reference # 08/969 Sample Date E9/9/2008 Lab Test Date 6/9-6/13 Sampled B P. Holder Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I 0.11 0.11 0.11 Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 46 460 366 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, total m /I Calcium, dissolved m /I Carbonate m /I Cation - Anion Balance m /I Cations me /I Chloride m /I 6.6 3.4 Conductivity µmhos/cm 95 975 632 817.5 Copper, dissolved m /I Hardness m /I 39 427 327.8 Hydroxide m /I Iron, dissolved m /I 0.63 0 0.02 Iron, total m /I 19.8 1.26 3.25 Lead, dissolved m /I Magnesium, dissolved m /I 37.6 37.6 37.6 Manganese, dissolved m /I 0.005 0.015 0.01 Manganese, total m /I 40 2 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N m /I Nitrate/Nitrite as N m /I 0.05 1.06 0.44 Nitrite as N m /I H SU 7.45 8 7.78 7.91 Phosphate m /I Phosphorus Ortho , dissolved m /I 0.206 0.018 Potassium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. 0.22 0.66 0.5 Sodium, dissolved m /I Sulfate m /I 38.9 86 57.6 TDS Ratio calc. TDS Calc. m /I TDS m /I 100 505 421 576 TSS m /I 155 Zinc, dissolved m /I Zinc, total mg/I Baseline pre -2000 data, adapted from VWVE (2001) z Enviro-Chem Analytical, Grand Junction, CO West Elk Mine E-23 2008 Annual Hydrology Report HydroGeo, Inc.