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Spring 243 Water Quality and Field Parameters u • • Mountain Coal West Elk Mine Monitoring Location Spring 24-3 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/t i/2005 6/6/2005 9/79/2005 Field Parameters Flow m Nol Reached 3.5 0.42 Electrical ConductlYl umhoS/cm 569 538 H SU 7.36 7.86 Temperature (°C) °C Tem erature °F) °F 42.3 55.2 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L51554-04 Sam le Date fi/6/2005 Lab Test Date 6/15-6/27 Sam led B Atkalini Total CaCO3 m /I 83 Aluminum, dissolved m /I -0.03 Anions me /I 3.7 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 Bicarbonate m /t &3 Boron, dissolved m /I -0.07 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 3a.6 Carbonate m /I ~ -2 Cation -Anion Balance m ll 3.t Cations me /I 3.3 Chloride m /I 2 Conductivit umhos/cm 326 Co er, dissolved m /I O.Ot Hardness m !I t23 H droxide m /I -2 Iron, dissolved m /I O.t2 Iron, total m A 0.19 Lead, dissolved m /I -0.04 Ma nesium, dissolved m /I 5.6 Man anese, dissolved m /I 0.006 Man anese, total m /I -0.005 Mercu ,total m /I -O.OO02 Mol bdenum, dissolved m /I -0.01 Nitrate as N ,dissolved m It Nitrate/Nitrite as N m /1 0.07 Nitrite as N ,dissolved m /I H SU 8.2 Phos hate m /I -0.03 Phos horns Ortho ,dissolved m h -O.Ot Potassium, dissolved m /I 2.0 Selenium, total m /I -0.001 Sodium Abso lion Ratio SAR talc. 0.73 Sodium, dissolved m /I 15.5 Sulfate m /I 70 TDS Ratio talc. 124 TDS Calc. m /I 78fi TDS m /I 230 TSS m !I 6 Zinc, dissolved mgll O.Oi ACZ Laborato , Steamboat S rin s, Colorado Ne alive values denote readin s below lab detection levels NA - not a licable NM -not measured NR -not re orted West Elk Mine E-1 2005 Annual Hydrology Report HydroGeo, Inc.