2009-07-01_REPORT - C1980007 (8)

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Spring 35-3 Water Quality and Field Parameters I ]l 0 Mountain Coal West Elk Mine Monitoring Location: Spring 35-3 Baseline' 2008 Water Year Description Units Minimum Maximum Mean ° 5/11/2008 6/8/2008 Enviro-Chem MDL 8/21/2008 Field Parameters Flow m 0.63 26.5 6.3 122 16.6 1.79 Electrical Conductivity mhos/cm 223 560 427.5 194 289 445 H SU 6.53 8.74 7.5 7.13 7.86 7.84 Temperature 0C 4.4 6.0 7.5 Comment Laboratory Parameters 3 Name of Certified Lab z Enviro-Chem Lab Reference # 08/943 Sample Date 6/8/2008 Lab Test Date 6/9-7/31 Sampled B P. Holder Alkalinity (Total CaC03) mg/I 102 217 170 104.1 2.000 Aluminum, dissolved m /I -0.03 0.09 0.04 0.175 0.01 Aluminum, total m /I Anions me /1 2.5 4.8 3.9 3.201 calc Arsenic, dissolved m /I Arsenic, total m /I 0.0009 0.0130 0.0039 0.004 0.001 Bicarbonate m /I 102 212 169 Boron, dissolved m /I -0.01 -0.01 -0.01 0.29 0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 0 0.001 Calcium, total m /I Calcium, dissolved m /I 18.2 47.2 34.3 31.1 0.1 Carbonate m /I -2 4 2 Cation - Anion Balance % -8.6 -2.1 -4.4 9.47 calc Cations me /I 2.3 4.6 3.6 3.536 calc Chloride m /I 1 11 3 1.44 0.1 Conductivity mhos/cm 216 451 351 222.95 1 Copper, dissolved m /I -0.01 -0.01 -0.01 0.017 0.002 Hardness m /I 59 142 105 101.66464 talc Hydroxide m /I -2 -2 -2 Iron, dissolved m /l -0.02 0.12 0.06 0.03 0.01 Iron, total m /I 0.19 42.50 9.14 1.29 0.01 Lead, dissolved m /I -0.04 -0.04 -0.04 0.006 0.005 Magnesium, dissolved m /l 3.3 5.8 4.8 5.83 0.1 Manganese. dissolved m /I -0.005 0.272 0.055 0.004 0.005 Manganese, total m /I 0.021 1.280 0.325 0.019 0.005 Mercury, total m /I -0.0002 0.0003 0.0001 0.00005 0.000025 Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0.0019 0.001 Nitrate as N m /I 0 0.13 Nitrate/Nitrite as N m /l -0.02 0.17 0.08 0 0.13 Nitrite as N m /l 0 0.01 H Lab SU 7.8 8.3 8.2 7.23 0.1 Phosphate m /I -0.03 0.15 0.07 0 0.01 Phosphorus Ortho , dissolved m /l -0.01 0.05 0.02 Potassium, dissolved m /I 0.7 1.4 0.9 1.28 0.1 Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 0.006 0.001 Sodium Absorption Ratio SAR talc. 1.27 1.60 1.45 1.391 calc Sodium, dissolved m /I 25.7 42.5 33.4 32.25 0.1 Sulfate m /I 10 30 20 21.81 2 TDS Ratio calc. 0.09 1.22 0.93 5.64 calo TDS Calc. m /I 131 248 199 199.65 2 TDS m /I 160 250 210 189 2 TSS m /I -5 510 133 0 2 Zinc, dissolved m /I -0.01 0.02 0.01 0 0.005 Zinc, total mg/l ' Baseline 2006 2 Enviro-Chem Analytical, Grand Junction, CO 3Zero values denote readings below lab detection levels (MDL). Average mean value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit s Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Cale)) / TDS))' 100 West Elk Mine E-29 2008 Annual Hydrology Report HydroGeo, Inc.