2010-06-30_REPORT - C1980007 (6)

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Upper Minnesota Creek Flume (USFS) Surface Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location U. Minnesota Ck (USFS) Flume Baseline 2009 Water Year Description Units Minimum Maximum Mean 5/8/2009 6/2/2009 Q ' 8/11/2009 Field Parameters Flow Staff Gauge or cfs Flooding Flooding 1.31' Electrical Conductivity umhos/cm 191 184 146 H SU 8.30 8.32 8.25 Temperature °C °C 11.9 12.1 18.2 Comment Laboratory Parameters' Name of Certified Lab 2 ACZ Lab Reference # L76236-09 Sample Date 6/2/2009 Lab Test Date 615-6/15 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 /I Calcium, dissolved m /I Carbonate m /I Cation - Anion Balance % Cations me /I Chloride m /I Conductivity umhos/cm 153 Copper, dissolved m /I Hardness m /I Hydroxide m /I Iron, dissolved m /I 0.08 Iron, total m /I 1.68 Lead, dissolved m /I Lead, total 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 /I Nitrite as N), dissolved m /I H lab SU 8.3 H Phosphate m /I Phosphorus Ortho , dissolved m /I Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. Sodium, dissolved m /I Sulfate m /I TDS Ratio talc. TDS Calc. m /I TDS m /I 100 TSS m /I 7 B Zinc, dissolved mg/I 'Baseline and WY 2000 data adapted from WWE (2001). 2 ACZ Laboratory, Steamboat Springs, CO ' 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). C-7 West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.