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Well SOM 23-1-1-1 <br />Water Quality and Field Parameters <br />E <br /> <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: SOM-23-1-1-1 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean <br />Field Parameters <br />Water Level Depth feet 134 175 154 <br />Electrical Conductivity µmhos/cm 1275 2360 1829 <br />H S U 6.97 7.29 7.20 <br />Temperature of 45.5 49.7 48.0 <br />Comment Collapsed Collapsed Collapsed <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I 628 686 654 <br />Aluminum, dissolved m /I <br />Ammonia m /I -0.01 0.01 0.01 <br />Anions me /I 15.6 16.4 16.2 <br />Arsenic, dissolved m /I -0.003 -0.001 -0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 628 686 654 <br />Boron, dissolved m /I 0.14 0.44 0.20 <br />Cadmium, dissolved m /I -0.005 -0.005 -0.005 <br />Calcium, dissolved m /I 21.9 26.1 23.6 <br />Carbonate m /I -2 -2 -2 <br />Cation - Anion Balance % -0.3 5.2 1.6 <br />Cations me /I 15.7 18.1 16.7 <br />Chloride m /I 5 17 7 <br />Conductivity µmhos/cm 1360 1550 1430 <br />Copper, dissolved m /I <br />Hardness m /I 93 107 98 <br />Hydroxide m /I -2 -2 -2 <br />Iron, dissolved m /I 0.69 9.51 3.56 <br />Iron, total m /I 5.18 27.70 17.60 <br />Lead, dissolved m /I 0.0002 0.0042 0.0011 <br />Magnesium, dissolved m /I 8.7 10.1 9.2 <br />Manganese, dissolved m /I 0.323 0.392 0.358 <br />Manganese, total m /I 0.398 0.568 0.478 <br />Mercury, dissolved m /I -0.0002 0.0003 0.0001 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N dissoloved m /I -0.02 0.14 0.03 <br />Nitrate/Nitrite as N m /I -0.02 0.15 0.03 <br />Nitrite as N dissoloved m /I -0.01 0.02 0.008 <br />Nitrogen, ammonia m /I 0.11 0.29 0.16 <br />H S U 8.0 8.2 8.1 <br />Phosphate m /I 0.03 0.12 0.05 <br />Phosphorus Ortho , dissolved m /I 0.01 0.04 0.02 <br />Potassium, dissolved m /I 3.3 3.8 3.5 <br />Selenium, dissolved m /I -0.005 -0.001 -0.002 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 14.2 15.2 14.6 <br />Sodium, dissolved m /I 311 357 325 <br />Sulfate m /I 140 150 146 <br />TDS Ratio calc. 0.86 1.04 0.97 <br />TDS Calc. m /I 869 945 908 <br />TDS m /I 810 940 877 <br />TSS m /I <br />Zinc, dissolved mg/I -0.01 0.02 0.01 <br />' Baseline 2005 <br />2 ACZ Labs, Steamboat Springs, Colorado <br />3 Negative values denote readings below lab detection levels <br />a Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all ri <br />5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />G-28 <br />West Elk Mine <br />2007 Annual Hydrology Report <br />HydroGeo, Inc.