2010-06-30_REPORT - C1980007 (7)

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Spring 24-3 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Spring 24-3 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 516/2009 5/26/2009 0° 8/8/2009 Field Parameters Flow m -15 4.21 0.52 Electrical Conductivity umhos/cm 352 501 612 H SU 8.08 8.48 8.22 Temperature 0C 4.9 5.2 8.3 Comment Laboratory Parameters' Name of Certified Labz ACZ Lab Reference # L76064-11 Sample Date 5/26/2009 Lab Test Date 5/29-6/5 Sampled B PH Alkalinity Total CaC03 m /I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I Boron, dissolved m /I Cadmium, dissolved m /l Calcium, dissolved m /I Carbonate m /I Cation - Anion Balance m /I Cations me /I Chloride m /I Conductivity umhos/cm 463 Copper, dissolved m /I Hardness m /I Hydroxide m /I Iron, dissolved m /I -0.02 U Iron, total m /I 0.04 B Lead, dissolved m /I Magnesium, dissolved m /I Manganese, dissolved m /I Manganese, total m /I Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /l Nitrite as N), dissolved m /I I..I SU 8.5 H Phosphate m /I Phosphorus Ortho , dissolved m /I Potassium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. Sodium, dissolved m /I Sulfate m /I TDS Ratio calc. TDS Calc. m /l TDS m /1 290 TSS m /l -5 U Zinc, dissolved mg/l 1 Baseline pre -2000 data, adapted from WWE (2001) 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. "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 conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine E-1 2009 Annual Hydrology Report HydroGeo, Inc.