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Well SO.W-1 <br />Water Quality and Field Parameters <br />• <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SO.W-1 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean <br />Field Parameters <br />Water Level Depth feet <br />Electrical Conductivity µmhos/cm 1680 1900 1790 <br />H SU 9.1 9.9 9.5 <br />Temperature °C 16.4 17.3 16.7 <br />Comment Obstructed Obstructed Obstructed <br />Laboratory Parameters 3 <br />Name of Certified Lab <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaC03) mg/I 266 881 772 <br />Aluminum, dissolved m /I <br />Ammonia m /I 1.23 1.57 1.4 <br />Anions me /I 18.3 19.8 18.9 <br />Arsenic, dissolved m /I 0 0.001 0 <br />Arsenic, total m /I 0.001 0.001 0.001 <br />Bicarbonate m /I 266 737 601 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I 0 0 0 <br />Calcium, dissolved m /I 2.1 2.8 2.6 <br />Carbonate m /I 0 310 171 <br />Cation - Anion Balance % 0.5 2.1 1.3 <br />Cations me /I 19.1 20 19.4 <br />Chloride m /I 14 19 16 <br />Conductivity µmhos/cm 1670 1750 1703 <br />Copper, dissolved m /I <br />Hardness m /I 18 30 26 <br />Hydroxide m /I 0 0 0 <br />Iron, dissolved m /I 0.04 0.66 0.3 <br />Iron, total m /I 2.59 7.07 4.14 <br />Lead, dissolved m /I 0 0 0 <br />Magnesium, dissolved m /I 3.2 5.5 4.8 <br />Manganese, dissolved m /I 0.014 0.025 0.017 <br />Manganese, total m /I 0.044 0.102 0.067 <br />Mercury, dissolved m /I o 0 0 ° <br />Mercury, total m /I 0 0 0 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I 0 0.15 0.03 <br />Nitrogen, ammonia m /I 1.58 2.01 1.71 <br />H SU 9.1 9.2 9.2 <br />Phosphate m /I 0.04 0.04 0.04 <br />Phosphorus Ortho , dissolved m /I 0 0 0 <br />Potassium, dissolved m /I 6.7 7.1 6.9 <br />Selenium, dissolved m /I 0 0 0 <br />Selenium, total m /I 0 0 0 <br />Sodium Absorption Ratio SAR calc. 33.7 40.8 36.4 <br />Sodium, dissolved m /I 398 437 420 <br />Sulfate m /I 40 90 76 <br />TDS Ratio talc. <br />TDS Calc. m /I <br />TDS m /I 930 1100 1007 <br />TSS m /I 0 36 21 <br />Zinc, dissolved mg/I 0.04 0.04 0.04 <br />Baseline andWY 2000 data adapted from WWE (2001). <br />2 ACZ Labs, Steamboat Springs, Colorado <br />3 Negative values denote readings below lab detection levels <br />4 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 />West Elk Mine <br />G-24 2007 Annual Hydrology Report HydroGeo, Inc.