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Spring G-22 Water Quality and Field Parameters Mountain Coal West Elk Mine Monitoring Location Spring G-22 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/2/2005 6/4/2005 8/20/2005 Field Paremeters Flow m 10 20 5 Electrical Conductivity µmh05/Cm 1400 1730 1366 H SU 7.44 7.47 7.10 Tem erature °C) °C Tem erature °F) °F 52.3 51.0 56.4 Comment Laborato Parameters Name of Certifed Lab Acz Lab Reference # L51498-07 $am le Date 6/4/2005 Lab Test Date 6/8-711 Sam led B Alkalinity (Total CaCO~) mg/I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /l Arsenic, total m /I BiCarbOnale m / 287 359 332 Boron, dissolved m /l Cadmium, dissolved m A Calcium, dissolved m /I 64.9 64.9 64.9 Carbonate m /I Cation -Anion Balance m /I Cations me /I Chloride m /l 3 18 7 Conductivity µmh05/Cm 633 640 637 1250 Co er, dissolved m A Hardness m /I 180 270 234 H roxide m /I Iron, tliSS0lved m /I 0.05 0.01 0.05 Iron, total m /I 0.2 0.06 1.27 Lead, dissolved m o.oz 6.0z 6.d2 Ma nesium, dissolved m A 19 1s.s 19.5 Man anese, dissolved m /I Man anese, total m /I 0.85 0.11 Mercu ,total m /I Mol bdenum, dissolved m A Nitrate as N , tlissolved m /I Nitrate/Nitrite as N m /I o.6a o.oa 0.06 Nitrite as N ,dissolved m ll H SU 7 7.9 7.6 8.0 Phos hate m /I Phos 1lorus Ortho , dissolvetl m I 0.044 0.019 Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /l Sodium Abso lion Ratio SAR talc. 1.76 1.92 1.85 Sodium, dissolved m /I 66.1 66.1 66.1 Sulfate m /1 24 80 41 TDS Ratio talc. TDS Calc. m /l TDS m /I 300 516 388 770 TSS m /l 2a 5 5s Zinc, dissolved m /l 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-13 2005 Annual Hydrology Report HydroGeo, Inc.