2010-06-30_REPORT - C1980007 (6)

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Poison Gulch Surface Water Quality and Field Parameters • • C-21 Mountain Coal West Elk Mine Monitoring Location: Poison Gulch Baseline 2009 Water Year Description Units Minimum Maximum Means 5/9/2009 6/3/2009 Q ° 8/9/2009 Field Parameters* Flow m 65.81 75 D Electrical Conductivity pmhos/cm 290 329 H SU 7.79 7.68 Temperature (°C) °C 13.6 15.8 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-08 Sample Date 6/3/2009 Lab Test Date 6/4-6/16 Sampled B PH Alkalinity (Total CaC03) mg/I 119 152 136 162 Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U Anions me /I 2.4 3.0 2.7 3.4 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.0007 0.0005 0.0006 B Bicarbonate m /l 119 152 136 161 Boron, dissolved m /I 0.02 0.03 0.03 0.02 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 22.0 35.5 28.8 34.2 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance % -2.1 7.7 4.4 0 Cations me /I 2.3 3.5 2.9 3.4 Chloride m /I 1 1 1 2 B Chromium m /I Conductivity ILmhos/cm 240 ___29_5 268 319 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /I Hardness m /I 78 124 101 119 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.07 0.11 0.09 0.09 Iron, total m /I 0.41 0.43 0.42 1.19 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Lead, total m /l Magnesium, dissolved m /I 5.6 8.6 7.1 8.2 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Manganese, total m /l -0.005 0.010 0.006 0.037 Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /1 -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 B Nitrite as N), dissolved m /I H SU 7.8 8.1 8.0 8.3 H Phosphate m /I 0.21 0.21 0.21 0.24 Phosphorus Ortho , dissolved m /I 0.07 0.07 0.07 0.08 Potassium, dissolved m /I 2.9 2.9 2.9 2.6 Selenium, dissolved m /I Selenium, total m /I -0.001 -0.001 -0.001 0.0002 B Silver, total m q/1 Sodium Absorption Ratio SAR calc. 0.82 0.92 0.87 0.94 Sodium, dissolved m /I 16.6 23.3 20.0 23.5 Sulfate m /I -10 -10 -10 10 TDS Ratio calc. 1.04 1.08 1.06 1.13 TDS Calc. m /l 120 163 142 177 TDS m /I 130 170 150 200 TSS mg/I -5 28 15 25 Zinc, dissolved _ mg/I -0.01 4.01 -0.01 -0.01 U Baseline 2005. 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.