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Spring G-20 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring LOCation Spring G-20 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/2/2005 6/4/2005 9/13/2005 Field Parameters Flow m 0.88 0.30 0.72 Electrical Conductivity {unhos/cm 821 1170 1057 H SU 8.08 8.45 8.92 Tem eralure (°C °C Temperature °F) °F 48.9 51.5 60.3 Comment Laborato Parameters Name of Certifed Lab ACZ Lab Reference # L5t496-OB Sam le Date 6/4/2005 Lab Test Date 8/8-7/t Sam led B Alkalinity (Total CaCO~) mg/I Aluminum, dissolved m /1 Anions me /I Arsenic, dissolved m /1 Arsenic, total m /I Bicarbonate m /I 452 657 539 Boron, dissolved m (I Cadmium, dissolved m /I Calcium, dissolved m /I 87 81 81 Carbonate m /I Cation -Anion Balance m /I Cations me /I Chloride Conductivity m /I µmhos/cm 1.2 970 10 1090 5.3 1023 857 Co er, dissolved m /I Hardness m /I 193 416 318 H droxide m /I Iron, dissolved m /I 0.05 0.01 0.02 Iron, total m /I 0.32 0.05 1.37 Lead, dissolved m /I Ma nesium, dissolved m /I 33.3 33.3 33.3 Man anese, dissolved m /I 0.002 0.002 0.002 Man anese, total m /I 0.08 0.005 Mercu ,total m /l Mol bdenum, dissolved m /l Nitrate as N m /I Nitrate/Nitrite as N m /I 0.01 0.05 0.03 Nitrite as N m /I H lab SU 7 8.1 7.7 8.4 Phos hate m /I Phos horns Ortho ,dissolved m /I O.t5 0.02 Potassium, dissolved m /l Selenium, dissolved m /I Selenium, total m /I Sodium Abso lion Ratio SAR talc. 2.31 2.73 2.52 Sodium, dissolved m /I 102 102 102 Sulfate m /I 16 117 81 TDS Ratio talc. TDS Calc. m /I TDS m /I 502 686 598 510 TSS m /I 19.6 3.5 36 Zinc, dissolved m9/I ACZ Laborato , Steamboat S rin s, Colorado Ne alive values denote readin s below lab detection levels NA - not a livable NM -not measured NR -not re orted West Elk Mine E-19 2005 Annual Hydrology Report HydroGeo, Inc.