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Spring 13~ Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Spring 73-4 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/11/2005 6/6/2005 9/19/2005 Field Parameters Fbw m 15.6 0.49 Wet Electrical Conductivity µmhos/cm 331 503 H SU 6.57 6.62 Tem erature °F 41.7 42.6 Comment was 24-3-A Laborato Parameters Name of Certifed Lab ACZ Lab Reference # LSi554AS Sam le Date 6/6/2005 Lab Test Date 6115-6/27 Sam led B Alkalinity (Total CaCO3) mgll 76 Aluminum, dissolved m /I 0.04 Anions me /I 2.6 Arsenic, dissolved m /1 -0.0005 Arsenic, total m /I Bicarbonate m ll 7a Boron, dissolved m /I 0.01 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 30.0 Carbonate m /I -2 Cation -Anion Balance m /I O.o Cations me /I 2.6 Chloride m /I 2 Conductivity µmhos/cm 291 Co er, dissolved m /I ~ -0.01 Hardness m /I too H droxide m !I -2 Iron, dissolved ~ m ll 0.03 Iron, total m /I 1.04 Lead, dissolved m /I -0.04 Ma nesium, dissolved m /I 7.t Man anese, dissolved m /I -0.006 Man anese total m /I o.OtS Mercu ,total m /I -0.0002 Mol bdenum dissolved m /I -0.ot Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /1 -0.02 Nitrite as N ,dissolved m /I H SU 7.9 Phos hate m /I -0.03 Phos horns Ortho ,dissolved m /I -0.01 Potassium, dissolved m /I t.3 Selenium, total m /I -o.o0t Sodium Abso lion Ratio SAR talc. 0.70 Sodium, dissolved m ll 16.4 Sulfate m /I 60 TDS Ratio talc. 1.22 TDS Calc. m A 164 TDS m ll 200 TSS m /I 6 Zinc, dissolved mg/I -0.ot AC2 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-5 2005 Annual Hydrology Report HydroGeo, Inc.