2010-06-30_REPORT - C1980007 (6)

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Upper Raven Gulch Surface Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location U. Raven Gulch Baseline 2009 Water Year Description Units Minimum Maximum Mean 5 5/6/2009 5/26/2009 Q ° 8/8/2009 Field Parameters Flow m 25640 6380 112 miectncai Conductivity mhos/cm 154 229 458 H SU 8.00 8.42 8.63 Temperature (°C) °C 9.7 9.1 17.0 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76041-02 Sample Date 5/26/2009 Lab Test Date 5/27-6/9 Sampled B PH Alkalinity (Total CaC03) mg/I 57 74 66 95 Aluminum, dissolved m /I -0.03 0.06 0.02 -0.03 U Anions me /l 1.3 1.8 1.6 2.3 Arsenic, dissolved m /I Arsenic, total m /I 0.0013 0.0016 0.0015 0.0013 B Bicarbonate m /I 57 73 65 91 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 15 19 17 22.5 Carbonate m /I -2 -2 -2 4 B Cation -Anion Balance m /I -2.9 0.0 -1.5 -2.2 Cations me /I 1 2 2 2.2 Chloride m /I -1 1 0 2 B Conductivity mhos/cm 133 165 149 211 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 48 62 55 74 Hydroxide m /l -2 -2 -2 -2 U Iron, dissolved m /I 0.04 0.08 0.06 -0.02 U Iron, total m /I 8.49 8.89 8.69 12.4 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /l 2.7 3.4 3.1 4.2 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Manganese, total m /l 0.185 0.193 0.189 0.218 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 Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.02 0.00 0.14 Nitrite as IN), dissolved m /l pH SU 7.8 8.3 8.1 8.5 H Phosphate m /l 0.09 0.15 0.12 0.03 B Phosphorus Ortho , dissolved m /I 0.03 0.05 0.04 0.01 B Potassium, dissolved m /I 0.9 1.0 1.0 1.0 B Selenium, total m /l -0.001 -0.001 -0.001 0.0004 B Sodium Absorption Ratio SAR calc. 0.52 0.64 0.58 0.92 Sodium, dissolved m /I 8.2 11.6 9.9 18.0 Sulfate m /l 10 20 15 18 TDS Ratio calc. 1.11 1.39 1.25 1.13 TDS Calc. m /I 72 99 86 124 TDS m /I 100 110 105 140 TSS T q/1 234 354 294 476 Zinc, dissolved mg/I -0.01 -0.01 -0.011 1 -0.01 U Baseline 2005 s 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 C-18 2009 Annual Hydrology Report HydroGeo, Inc.