2009-07-01_REPORT - C1980007 (8)

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Spring J-2 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location: Spring J-2 Baseline' 2008 Water Year Description Units Minimum Maximum Mean ° 5/5/2008 6/8/2008 Enviro-Chem MDL 8/23/2008 Field Parameters Flow m 0.11 0.26 0.18 0.61 0.22 0.14 Electrical Conductivity mhos/cm 975 1690 1281 874 1231 1144 H SU 8.26 9.1 8.59 8.11 8.68 8.83 Temperature C 9.6 19.6 14.40 11.6 7.9 20.5 Comment Laboratory Parameters 3 Name of Certified Lab Enviro-Chem Lab Reference # 08/951 Sample Date 6/8/2008 Lab Test Date 6/9-7/31 Sampled B P. Holder Alkalinity (Total CaC03) mg/I 605 650 637 550.19 2.000 Aluminum, dissolved m /I -0.03 0.20 0.12 0.51 0.01 Aluminum, total m /I Anions me /I 12.7 14.6 13.5 13.718 talc Arsenic, dissolved m /I Arsenic, total m /I -0.005 0.010 0.003 0.165 0.001 Bicarbonate m /I 557 614 584 Boron, dissolved m /I 0.45 0.59 0.54 1.87 0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.006 0.001 Calcium, total m /I Calcium, dissolved m /I 4.2 10.9 5.8 14.7 0.1 Carbonate m /I 36 72 53 Cation - Anion Balance % -8.6 0.7 -4.6 1.71 talc Cations me /I 11.4 13.5 12.3 13.956 talc Chloride m /I 4 12 6 2.46 0.1 Conductivity mhos/cm 1090 1190 1145 1026.09 1 Copper, dissolved m /I -0.01 -0.01 -0.01 0.057 0.002 Hardness m /I 21 47 28 82.0039 talc Hydroxide m /I -2 -2 -2 Iron, dissolved m g/1 0.05 1.80 0.44 0.38 0.01 Iron, total m /I 1.36 37.70 8.42 2.01 0.01 Lead, dissolved m /I -0.04 -0.04 -0.04 0.019 0.005 Magnesium, dissolved m /I 2.4 4.7 3.2 11 0.1 Manganese, dissolved m /I 0.012 0.18 0.05 0.005 0.005 Manganese, total m /I 0.046 0.872 0.204 0.044 0.005 Mercury, total m /I -0.0002 0.0003 0.0002 0.0001 0.000025 Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0.002 0.001 Nitrate as N m /I 0 0.13 Nitrate/Nitrite as N m /I -0.02 1.14 0.24 0 0.13 Nitrite as N m /I 0.02 0.01 H SU 8.4 8.8 8.6 8.76 0.1 Phosphate m /I 0.46 1.36 0.72 0.03 0.01 Phosphorus Ortho , dissolved m /I 0.15 0.44 0.23 Potassium, dissolved m /I 1.4 5.0 2.1 3.83 0.1 Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 0.009 0.001 Sodium Absorption Ratio SAR talc. 16.30 27.60 23.03 13.37 talc Sodium, dissolved m /I 248 295 266 278.25 0.1 Sulfate m /I -10 60 27 59.68 2 TDS Ratio talc. 0.96 1.21 1.04 2.92 talc TDS Calc. m /I 664 752 715 925.22 2 TDS m /I 650 910 742 899 2 TSS m /I 20 754 192 17 2 Zinc, dissolved mg/I -0.01 0.19 0.04 0 0.005 Baseline 2006 2 Enviro-Chem Analytical, Grand Junction, CO 3-Zero values denote readings below lab detection levels (MDL). Average mean value talc using 1/2 of detection limit for readings below lab detection limits unless all readin s are below lab detection limit a Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)) ` 100 West Elk Mine E-32 2008 Annual Hydrology Report HydroGeo, Inc.