2008-06-27_REPORT - C1980007 (7)

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Well SOM-45-H-1 Water Quality and Field Parameters • 11 u Mountain Coal West Elk Mine Monitoring Location Well SOM-45-1-1-1 Baseline' 2007 Water Year Description Units Minimum Maximum Mean Field Parameters Water Level Depth feet Electrical Conductivity µmhos/cm pH SU Temperature Comment OF Obstructed Obstructed Obstructed Laboratory Parameters 3 Name of Certified Lab z Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I Ammonia m /I Anions me /I Arsenic, dissolved m /I 0.001 0.001 0.001 Arsenic, total m /I Bicarbonate m /I 768 768 768 Boron, dissolved m /I Cadmium, dissolved m /I 0 0 0 Calcium, dissolved m /I 6 6 6 Carbonate m /I Cation - Anion Balance % Cations me /I Chloride m /l 9 9 9 Conductivity µmhos/cm Copper, dissolved rn /l Hardness m /I 23 23 23 Hydroxide m /I Iron, dissolved m /I 0.34 0.34 0.34 Iron, total m /I Lead, dissolved m /I Magnesium, dissolved m /I 1.9 1.9 1.9 Manganese, dissolved m /I 0.056 0.056 0.056 Manganese, total m /I Mercury, total m /I 0 0 0 Molybdenum, dissolved m /I Nitrate/Nitrite as N m /I 0 0 0 Nitrogen, ammonia m /I H SU Phosphate m /I Phosphorus Ortho , dissolved m /I 0.007 0.007 0.007 Potassium, dissolved m /I Selenium, dissolved m /I 0 0 0 Selenium, total m /I Sodium Absorption Ratio SAR calc. 32.9 32.9 32.9 Sodium, dissolved m /I 357 357 357 Sulfate m /I 30 30 , 30 TDS Ratio calc. TDS Calc. m /I TDS m /I 850 850 850 TSS m /I Zinc, dissolved mg/I 0.01 0.01 0.01 Baseline andWY 2000 data adapted from WWE (2001). 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte cone detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine G-11 2007 Annual Hydrology Report HydroGeo, Inc.