2009-07-01_REPORT - C1980007 (8)

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Spring G-25 Water Quality and Field Parameters n • • Mountain Coal West Elk Mine Monitoring Location Spring G-25 Baseline 2008; Water Year Description Units Minimum Maximum Mean 5/7/2008 6/9/2008 8/24/2008 Field Parameters Flow m 181 42 3.2 Electrical Conductivity µmhos/cm 1658 1598 1687 H SU 6.77 7.46 7.61 Temperature (°C) °C 7.7 7.6 8.2 Comment Laboratory Parameters Name of Certified Lab Enviro-Chem Lab Reference # 08/966 Sample Date 6/9/2008 Lab Test Date 6/9-6/13 Sampled B P. Holder Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 224 828 573 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 2 20 6 Conductivity µmhos/cm 777 1320 1134 1213.6 Copper, dissolved m /I Hardness m /I 219 1379 514 Hydroxide m /I Iron, dissolved m /I 0.135 0.022 0.04 Iron, total m /I 0.99 0.09 0.48 Lead, dissolved m /I 0.02 0.02 0.02 Magnesium, dissolved m /I 70.9 70.9 70.9 Manganese, dissolved m /I Manganese, total m /I 0.01 0.002 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N m /I Nitrate/Nitrite as N m /I 0.19 1.22 0.4 Nitrite as N m /I H SU 6.85 8.5 7.44 7.5 Phosphate m /I Phosphorus Ortho , dissolved m /I 1.55 0.09 Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. 0.49 3.8 2.2 Sodium, dissolved m /I Sulfate m /I 88 325 242 TDS Ratio calc. TDS Calc. m /I TDS m /I 336 1170 843 1064 TSS m /I 26 7 2 Zinc, dissolved m /I Zinc, total mg/I Baseline pre -2000 data, adapted from WWE (2001) z Enviro-Chem Analytical, Grand Junction, CO West Elk Mine E-25 2008 Annual Hydrology Report HydroGeo, Inc.