2010-06-30_REPORT - C1980007 (6)

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Horse Gulch Surface Water Quality and Field Parameters • • C-13 Mountain Coal West Elk Mine Monitoring Location Horse Gulch Baseline 2009 Water Year Description Units Minimum Maximum Mean 5/8/2009 612/2009 8/11/2009 Field Parameters Flow m D D Dry Electrical Conductivity umhos/cm 240 740 542 H SU 8.2 8.5 8.3 Temperature °C) °C 5.1 14.7 10.0 Comment Laboratory Parameters 3 Name of Certified Lab 2 Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity Total CaC03 m /I 128 332 270 Aluminum, dissolved m /I 0.04 0.04 0.04 Anions me /I 6.5 6.5 6.5 Arsenic, Dissolved m /I Arsenic, total m /I 0.001 0.001 0.001 Bicarbonate m /I 128 331 268 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 0.004 0.000 Carbonate m /I 9 2 Cation - Anion Balance % -4.8 -4.8 -4.8 Cations me /I 5.9 5.9 5.9 Chloride m /I 1 5 3 Conductivity umhos/cm 780 780 780 Copper, dissolved m /I Hardness m /I 89 324 255 Hydroxide m /I Iron, dissolved m /I 0.05 0.05 0.05 Iron, total mg/1 0.1 3.09 0.83 Lead, dissolved m /I Lead, total m /I Magnesium, dissolved m /I 7 29.4 22.7 Manganese, dissolved m /I 0.007 0.007 0.007 Manganese, total m /I 0.34 0.04 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I 0.36 0.12 Nitrite as N), dissolved m /I H lab SU 8.3 8.3 8.30 Phosphate m /I 0.11 0.11 0.11 Phosphorus Ortho , dissolved m /I 0.037 0.011 Potassium, dissolved m /I 3.6 3.6 3.6 Selenium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. 0.72 1.35 1.2 Sodium, dissolved m /I 15.5 54 41.1 Sulfate m /I 10 90 66 TDS Ratio calc. TDS Calc. m /I TDS m /I 170 440 354 TSS m /I Zinc, dissolved mg/I Baseline and WY 2000 data adapted from WWE (2001). West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.