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Spring 13-3 Water Quality and Field Parameters C J r1 LJ • Mountain Coal West Elk Mine Monitoring Location Spring 13.3 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/11/2005 6/6/2005 9/19/2005 Field Parameters Flow m 50 6.45 0.28 Electrical Conductivi umho5/cm 52a 678 397 H SU 6.68 6.77 6.83 Tem erature °F 43.5 42.7 58.6 Comment was 24-3-B Laborato Parameters Name of Certified Lab ACZ Lab Reference # L51554-06 Sam le Date 6/6/2005 Lab Test Date 6/9-6/29 Sam led B Alkalini Total CaCO3 m A 11a Aluminum, dissolved m /I -0.03 Anions me /I 3.8 Arsenic, dissolved m A Arsenic, total m /I -0.0005 Bicarbonate m /I 114 Boron, dissolved m A ~ 0.01 Cadmium, dissolved ~ m /I -0.005 Calcium, dissolved m A 35.8 Carbonate m A -2 Cation -Anion Balance m /I 0.0 Cations me /I 3.8 Chloride m A 2 Condudivi umhos/cm 379 Co er, dissolved m /I -0.01 Hardness m /I 127 H droxide m /I -2 Iron, dissolved m A -0.01 Iron, total m /I 0.03 Lead, dissolved m /I -0.04 Ma nesium, dissolved m /I 9.2 Man anese, dissolved m /I -0.005 Man anese, total m !I -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m A -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.03 Nitrite as N ,dissolved m /I H SU 8.1 Phos hate m P -0.03 Phos horns Ortho ,dissolved m /I -0.01 Potassium, dissolved !I 1.4 Selenium, total m /I -0.001 Sodium Abso lion Ratio (SAR talc. 1.11 Sodium, dissolved m /I 28.4 Sulfate m /I 70 TDS Ratio talc. 1.16 TDS Calc. m /I 215 TDS m /I 250 TSS m /I -5 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 licable NM -not measured NR -not re orted West Elk Mine E-d 2005 Annual Hydrology Report HydroGeo, Inc-