2010-06-30_REPORT - C1980007 (6)

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Deep Creek Ditch Surface Water Quality and Field Parameters • is C-22 Mountain Coal West Elk Mine Monitoring Location: Deep Creek Ditc h Baseline 2009 Water Year Description Units Minimum Maximum Mean 5 5/9/2009 6/4/2009 Q ° 8/9/2009 Field Parameters* Flow m / staff 69.77 1527.27 562.69 0.30' 0.25' 0.20' Electrical Conductivity µmhos/cm 75.9 928 316 71 816 62.9 H SU 6.32 8.20 7.27 8.11 8.20 8.08 Temperature (°C) °C 5.0 11.9 9.6 7.6 9.7 12.7 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L76236-15 Sample Date 6/4/2009 Lab Test Date 6/5-6/17 Sampled B PH Alkalinity (Total CaC03) mg/I 25 60 45 35 Aluminum, dissolved m /I 0.05 0.15 0.10 -0.03 U Anions me /I 0.5 1.4 0.9 0.7 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.0006 0.0003 -0.0005 U Bicarbonate m /I 25 60 45 35 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 4.6 13.7 10.1 8.1 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance % -11.1 6.7 -3.0 0 Cations me /I 0.4 1.2 0.9 0.7 Chloride m /I 1 9 3 -1 U Chromium m /I Conductivity jimhos/cm 50 113 88 68 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /I Hardness m /I 16 47 35 28 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.04 0.14 0.09 0.04 B Iron, total m /I 1.19 2.59 1.83 1.78 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Lead, total m /I Magnesium, dissolved m /I 1.1 3.1 2.3 1.9 Manganese, dissolved m /I -0.005 0.013 0.005 -0.005 U Manganese, total m /I 0.032 0.090 0.064 0.067 Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Nickel, dissolved m /I Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 3.39 0.90 -0.02 U Nitrite as N), dissolved m /I H Lab SU 7.8 8.1 8.0 8.1 H Phosphate m /I 0.06 0.09 0.08 0.06 B Phosphorus Ortho , dissolved m /I 0.02 0.03 0.03 0.02 B Potassium, dissolved m /I -0.3 0.7 0.5 0.4 B Selenium, dissolved m /I Selenium, total m /l -0.001 -0.001 -0.001 0.0001 B Silver, total m /I Sodium Absorption Ratio SAR caic. 0.19 0.33 0.28 0.27 Sodium, dissolved m /I 1.8 5.2 3.9 3.3 Sulfate m /I -10 -10 -10 -1 U TDS Ratio calc. 1.38 2.05 1.64 2.29 TDS Calc. m /I 24 68 47 35 B TDS m /I 40 100 75 80 TSS m /I a 76 32 36 Zinc, dissolved mg/I -0.01 0.03 0.02 0.01 B Baseline 2006. 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). 5 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.