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Horse Gulch <br />Surface Water Quality and Field Parameters <br />• <br /> <br />Mountain Coal West Elk Mine <br />Monitoring Location <br />Description Horse Gulch <br />Units Baseline <br />Minimum Maximum Mean 2007 Water Year <br />4/27/2007 5/30/2007 8/24/2007 <br />Field Parameters <br />Flow m D D D <br />Electrical Conductivity umhos/cm 240 740 542 <br />H SU 8.2 8.5 8.3 <br />Temperature °C °C 5.1 14.7 10.0 <br />Temperature °F OF 41.2 58.5 50.0 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab s <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity Total CaC03 m /I 128 332 270 <br />Aluminum, dissolved m /I 0.04 0.04 0.04 <br />Anions me /I 6.5 6.5 6.5 <br />Arsenic, Dissolved m /I <br />Arsenic, total m /I 0.001 0.001 0.001 <br />Bicarbonate m /I 128 331 268 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I 0.004 0.000 <br />Carbonate m /I 9 2 <br />Cation - Anion Balance % 4.8 -4.8 -4.8 <br />Cations me /1 5.9 5.9 5.9 <br />Chloride m /I 1 5 3 <br />Conductivity Umhos/cm 780 780 780 <br />Copper, dissolved <br />Hardness m /I <br />m /I <br />89 <br />324 <br />255 <br />Hydroxide m /I <br />Iron, dissolved <br />Iron, total <br />Lead, dissolved <br />Lead, total <br />Magnesium, dissolved m /I <br />m /I <br />m /I <br />m q/1 <br />m /I 0.05 <br />0.1 <br /> <br /> <br />7 0.05 <br />3.09 <br /> <br /> <br />29.4 0.05 <br />0.83 <br /> <br /> <br />22.7 <br />Manganese, dissolved <br />Man anese, total m /l <br />m /I 0.007 0.007 <br />0.34 0.007 <br />0.04 <br />Mercury, total <br />Molybdenum, dissolved <br />Nitrate as N), dissolved m /I <br />m /l <br />m /I <br />Nitrate/Nitrite as N m /I 0.36 0.12 <br />Nitrite as N), dissolved <br />H lab m /I <br />SU <br />8.3 <br />8.3 <br />8.30 <br />Phosphate m q/1 0'11 0.11 0.11 <br />Phosphorus Ortho , dissolved m /I 0.037 0.011 <br />Potassium, dissolved <br />Selenium, dissolved <br />Selenium, total <br />Sodium Absorption Ratio SAR m /I <br />m /I <br />m /I <br />Cale. 3.6 <br /> <br /> <br />0.72 3.6 <br /> <br /> <br />1.35 3.6 <br /> <br /> <br />1.2 <br />Sodium, dissolved <br />Sulfate m /I <br />m /I 15.5 <br />10 54 <br />90 41.1 <br />66 <br />TDS Ratio Cale. <br />TDS Calc. m /I <br />TDS m /I 170 440 354 <br />TSS m /I <br />Zinc, dissolved mg/I <br />Baseline and WY 2000 data adapted from WWE (2001). <br />2 ACZ Laboratory, Steamboat Springs, CO <br />a Negative values denote readings below lab detection levels <br />C-13 <br />West Elk Mine <br />2007 Annual Hydrology Report <br />HydroGeo, Inc.