2009-07-01_REPORT - C1980007 (8)

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Spring G-24 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location Spring G-24 Baseline' 2008 Water Year Descri tion Units Minimum Maximum Mean 5/9/2008 6/6/2008 Enviro- Chem MDL 8/23/2008 Field Parameters Flow m N/A 33 6.7 Electrical Conductivity pmhos/cm N/A 894 824 H SU N/A 7.35 7.45 Temerature (°C) °C N/A 8.3 8.4 Comment Engulfed by Syl. Gulch Laboratory Parameters3 Name of Certified Lab Enviro-Chem Lab Reference # 08/916 Sample Date 6/6/2008 Lab Test Date 6/9-7/3 Sampled B P. Holder Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I 0.08 0.04 Anions me /I Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 0.001 Bicarbonate m /I 267 376 307 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 4 56.4 56.4 Carbonate m /I Cation - Anion Balance m /I Cations me /I Chloride m /I 1.2 10 4.4 Conductivity mhos/cm 550 564 557 760.91 1 Copper, dissolved m /I Hardness m /I 176 233 203 Hydroxide m /I Iron, dissolved m /I 0.1 0.03 0.02 0.01 Iron, total m /I 2.28 0.45 1.0900 0.01 Lead, dissolved m /I Magnesium, dissolved m /I 15.9 16.5 16.2 Manganese, dissolved m /I 0.006 0.002 Manganese, total m /I 0.048 0.005 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I 0.05 0.1 0.08 Nitrite as N), dissolved m /I H SU 7.2 8.3 7.9 7.38 0.1 Phosphate m /I Phosphorus Ortho , dissolved m /I 0.105 0.027 Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. 2 1.8 1.8 Sodium, dissolved m /I 58.9 58.9 58.9 Sulfate m /I 21.2 70 30.5 TDS Ratio talc. TDS Calc. m /I TDS m /I 214 520 362 506 2 TSS m /I 102 21 0 2 Zinc, dissolved mg/I Baseline pre -2000 data, adapted from VVVVE (2001) 2 Enviro-Chem Analytical, Grand Junction, CO 'Zero values denote readings below lab detection levels (MDL). e Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)]' 100 West Elk Mine E-11 2008 Annual Hydrology Report HydroGeo, Inc.