2008-06-27_REPORT - C1980007 (6)

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Spring 10-1 Water Quality and Field Parameters is 10 • Mountain Coal West Elk Mine Monitoring Location Spring 10-1 Baseline 2007 Water Year Description Units Minimum Maximum Mean 4/26/2007 5/24/2007 Q° 8/24/2007 Field Parameters Flow m 3.37 3.26 1.72 Electrical Conductivity µmhos/cm 884 1617 1683 H SU 9.93 8.07 7.91 Temperature (°F) OF 64.2 51.1 61.0 Temerature (°C) °C 10.6 16.1 Comment Laboratory ParameterS3 Name of Certified Lab ACZ Lab Reference # L62830-09 Sample Date 5/24/2007 Lab Test Date 5/29-6/8 Sampled B Alkalinity (Total CaCO3) mg/I Aluminum, dissolved m /I Anions me /1 Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 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 /1 Chloride m /I Conductivity µmhos/cm 1630 Copper, dissolved m /I Hardness m /I Hydroxide m /I Iron, dissolved m /I 0.03 B Iron, total m /l 0.29 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 m /I Nitrate/Nitrite as N m /I Nitrite as N m /I H SU 8.7 H Phosphate m /l 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 TDS Ratio calc. TDS Calc. m /I TDS m /I 9701 1 TSS m /I 12 B Zinc, dissolved m /l Zinc, total 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 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 conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine E-15 2007 Annual Hydrology Report HydroGeo, Inc.