2009-07-01_REPORT - C1980007 (7)

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Upper Raven Gulch Surface Water Quality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location U. Raven Gulch Baseline 2008 Water Year Descri tlon Units Minimum Maximum Mean a 5/6/2008 6/2/2008 Enviro- Chem MDL 8/24/2008 Field Parameters' Flow m 61933 20000 363 Electrical Conductivity mhos/cm 186 198 387 H SU 7.54 8.46 8.61 Temperature (°C) °C 6.5 13.0 17.3 Comment Laboratory Parameters 3 Name of Certified Lab 2 Enviro- Chem Lab Reference # 08/828 Sample Date 6/2/2008 Lab Test Date 6/3-6/26 Sampled B P. Holder Alkalinity (Total CaC03) mg/I 57 74 66 60.26 2 Aluminum, dissolved m /I -0.03 0.06 0.02 0.11 0.01 Anions me /I 1.3 1.8 1.6 2.294 calc Arsenic, dissolved m /I Arsenic, total m /I 0.0013 0.0016 0.0015 0.0016 0.001 Bicarbonate m /I 57 73 65 Boron, dissolved m /I -0.01 -0.01 -0.01 0.015 0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.003 0.001 Calcium, dissolved m /I 15 19 17 23.1 0.1 Carbonate m /l -2 -2 -2 Cation - Anion Balance m /I -2.9 0.0 -1.5 -5.47 calc Cations me /I 1 2 2 2.175 calc Chloride m /I -1 1 0 2.356 0.1 Conductivity mhos/cm 133 165 149 177.85 1 Copper, dissolved m /I -0.01 -0.01 -0.01 0.003 0.002 Hardness m /I 48 62 55 82.47106 calc Hydroxide m /l -2 -2 -2 Iron, dissolved m /I 0.04 0.08 0.06 0.143 0.01 Iron, total m /I 8.49 8.89 8.69 1.87 0.01 Lead, dissolved m /I -0.04 -0.04 -0.04 0 0.005 Magnesium, dissolved m /I 2.7 3.4 3.1 6.02 0.1 Manganese, dissolved m /I -0.005 -0.005 -0.005 0 0.005 Manganese, total m /I 0.185 0.193 0.189 0.094 0.005 Mercury, total m /I -0.0002 -0.0002 -0.0002 0.0001 0.000025 Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0 0.01 Nitrate as N), dissolved m /I 0 0.13 Nitrate/Nitrite as N m /I -0.02 0.02 0.00 0 0.13 Nitrite as N), dissolved m /I 0.02 0.01 H SU 7.8 8.3 8.1 7.7 0.1 Phosphate m /I 0.09 0.15 0.12 0.03 0.01 Phosphorus Ortho , dissolved m /I 0.03 0.05 0.04 0.0359 0.01 Potassium, dissolved m /I 0.9 1.0 1.0 1.19 0.1 Selenium, total m /I -0.001 -0.001 -0.001 0 0.001 Sodium Absorption Ratio SAR calc. 0.52 0.64 0.58 0.74 calc Sodium, dissolved m /I 8.2 11.6 9.9 15.6 0.1 Sulfate m /I 10 20 15 10.29 2 TDS Ratio calc. 1.11 1.39 1.25 5.36 calc TDS Calc. m /I 72 99 86 121.13 2 TDS m /I 100 110 105 128 2 TSS m /I 234 354 294 154 2 Zinc, dissolved mg/I -0.01 -0.01 -0.01 0.013 0.005 ' Baseline 2005 2 Enviro-Chem Analytical, Grand Junction, CO 'Zero values denote readings below lab detection levels (MDL). s Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Cale.)) / TDS)] * 100 6 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 2008 Annual Hydrology Report HydroGeo, Inc.