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Spring 24-3 Water Quality and Field Parameters • • Mountain Coal West EIk Mine Monitoring Location Spring 24-3 Baseline 2005 Water Year Descri ti0n Units Minimum Maximum Mean 5/11/2005 6/6/2005 9/19/2005 Field Parameters Flow m Not Reached 3.5 0.42 Electrical Conductivi umhos/cm 569 538 H SU 7.36 7.86 Tem erature (°C) °C Tem erature °F °F 42.3 55.2 Comment Laborato Parameters Name of Certifed Lab ACZ Lab Refefence # L51554-04 Sam to Date 6/6!2005 Lab Test Date 6/15-6/27 Sam led 8 Alkalini Total CaCO3 m /I 83 Aluminum, dissolved m /I -0.03 Anions me /I 3.1 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 Bicarbonate m /I 83 Boron, dissolved m /I -0.01 Cadmium, dissolved m !I -0.005 Calcium, dissolved m /I 30.6 Carbonate m /I -2 Cation -Anion Balance m !I 3.1 Cations me /I 3.3 Chloride m /I 2 Conducfivit umhos/cm 328 Co er, dissolved m /I 0.01 Hardness m /I 123 H droxide m /I -2 Iron, dissolved m /I 0.12 Iron, total m /I 0'19 Lead, dissolved m /1 -0.04 Ma nesium, dissolved m !I 8.8 Man anese, dissolved m /I 0.006 Man anese, total m /I -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.07 Nitrite as N ,dissolved m /I H SU 8.2 Phos hate m /I -0.03 Phos horns Ortho ,dissolved m /I -0.01 Potassium, dissolved m /I 2.0 Selenium, total m /I -0.001 Sodium Absor lion Ratio SAR talc. 0.73 Sodium, dissolved m /I 18'5 Sulfate m /I 70 TDS Ratio cola 124 TDS Calc. m /I 166 TDS m /I 230 TSS m /I 6 Zinc, dissolved mg/I 0.01 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-1 2005 Annual Hydrology Report HydroGeo, Inc.