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Spring G-31 <br />Water Quality and Field Parameters <br />1 <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Spring G-31 Baseline 2007 Water Year <br />Description Units Minimum Maximum Mean 4/27/2007 5/24/2007 Q° 8/23/2007 <br />Field Parameters <br />Flow m 0.47 See See <br />Electrical Conductivity µmhos/cm 976 1058 1056 <br />H SU 7.74 7.39 8.52 <br />Temperature (°F) OF 45.0 44.1 76.8 <br />Temperature (°C) °C 7.2 6.7 24.9 <br />Comment <br />Laboratory ParameterS3 <br />Name of Certified Lab ACZ <br />Lab Reference # L62830-05 <br />Sample Date 5/24/2007 <br />Lab Test Date 5/29-6/8 <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I <br />Aluminum, dissolved m /I 0.11 0.11 0.11 <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I 46 460 366 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, total m /I <br />Calcium, dissolved m /I <br />Carbonate m /I <br />Cation - Anion Balance m /I <br />Cations me /I <br />Chloride m /I 6.6 3.4 <br />Conductivity µmhos/cm 95 975 632 1050 <br />Copper, dissolved m /I <br />Hardness m /I 39 427 327.8 <br />Hydroxide m /I <br />Iron, dissolved m /I 0.63 0 0.08 <br />Iron, total m /I 19.8 1.26 0.12 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I 37.6 37.6 37.6 <br />Manganese, dissolved m /I 0.005 0.015 0.01 <br />Manganese, total m /I 40 2 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N m /I <br />Nitrate/Nitrite as N m /I 0.05 1.06 0.44 <br />Nitrite as N m /I 7.45 8 7.78 <br />H SU 8.3 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I 0.206 0.018 <br />Potassium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 0.22 0.66 0.5 <br />Sodium, dissolved m /I <br />Sulfate m /I 38.9 86 57.6 <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS m /I 100 505 421 600 <br />TSS m /I 6 B <br />Zinc, dissolved <br />I <br />mg/ <br />Zinc, total mg/I <br />Baseline pre -2000 data, adapted from WWE (2001) <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels <br />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 <br />West Elk Mine <br />E-23 2007 Annual Hydrology Report HydroGeo, Inc.