2010-06-30_REPORT - C1980007 (7)

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Spring G-28A Water Quality and Field Parameters • u Mountain Coal West Elk Mine Monitoring Location Spring G-28A Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5/7/2009 6/2/2009 Q4 8/8/2009 Field Parameters Flow m 2.31 1.0 1.13 Electrical Conductivity mhos/cm 1030 1073 1098 H SU 7.89 7.75 7.73 Temperature (°C) °C 8.8 10.2 11.3 Comment Laboratory ParameterS3 Name of Certified Labz ACZ Lab Reference # L76196-14 Sample Date 6/2/2009 Lab Test Date 6/4-6/11 Sampled B PH Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 338 400 367.4 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I Carbonate m /I Cation - Anion Balance m /I Cations me /l Chloride m /I 5 10 6 Conductivity mhos/cm 1600 1600 1600 1040 Copper, dissolved m /I Hardness m /I 162 654 338 Hydroxide m /I Iron, dissolved m /I -0.02 U Iron, total m /I 0.06 1.12 0.526 0.27 Lead, dissolved m /I Magnesium, dissolved m /I Manganese, dissolved m /l Manganese, total m /I 0.02 0 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N)- m /I 0.21 0.132 Nitrite as N), dissolved m /I H SU 7.9 7.9 7.9 8.5 H Phosphate m /I Phosphorus Ortho , dissolved m /I Potassium, dissolved m /I Selenium, total m /l Sodium Absorption Ratio SAR calc. Sodium, dissolved m /I Sulfate m /I 64 550 166.8 TDS Ratio calc. TDS Calc. m /I TDS m /I 420 1100 581 660 TSS m /I -5 U Zinc, dissolved mg/l ' Baseline pre -2000 data, adapted from WWE (2001) 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. s 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-22 2009 Annual Hydrology Report HydroGeo, Inc.