2009-07-01_REPORT - C1980007 (8)

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Spring G-16 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location Spring G-16 Baseline' 2008 Water Year Descri tion Units Minimum Maximum Mean 5/9/2008 6/6/2008 Enviro- Chem MDL 8123/2008 Field Parameters Flow m 22 9.8 5.6 Electrical Conductivity mhos/cm 457 617 686 H SU 7.63 8.12 8.25 Temerature °C °C 6.7 7.5 6.8 Comment Laboratory Parameters' Name of Certified Labe Enviro-Chem Lab Reference # 08/913 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 Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 241 441 307 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 55.2 55.9 55.6 Carbonate m /I Cation - Anion Balance m /I Cations me /I Chloride m /I 2 12 5 Conductivity mhos/cm 529, 1120 691 498.24 1 Copper, dissolved m /I Hardness m /I 160 453 220 Hydroxide m /I Iron, dissolved m /I 0.08 0.01 0.01 0.01 Iron, total m /I 4.63 0.56 0.15 0.01 Lead, dissolved m /I Magnesium, dissolved m /I 15.1 15.8 15.3 Manganese, dissolved m /I Manganese, total m /I 0.07 0.01 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I 0.07 0.16 Nitrite as N), dissolved m /I H SU 7.1 8.2 d7.7 7.93 0.1 Phos hate m /I Phos horus Ortho , dissolved m /I 0.19 Potassium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. 1.4 2 1.8 Sodium, dissolved m /I 58.1 64.5 61.3 Sulfate m /I 18.2 200 51.6 TDS Ratio calc. TDS Calc. m /I TDS m /I 274 700 349 363 2 TSS m /I 194 21 0 2 Zinc, dissolved mg/I 1 Baseline pre -2000 data, adapted from WWE (2001) 2 Enviro-Chem Analytical, Grand Junction, CO 3 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-10 2008 Annual Hydrology Report HydroGeo, Inc.