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Spring 13-1 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Spring 13-1 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/17/2005 6/6!2005 9/19/2005 Field Parameters Flow m 0.3 0.25 0.22 Electrical Conductivi umhos/cm 1302 1375 7260 H SU 6.1 8.27 7.73 Tem erature °F ~ 41.3 56.1 58.4 Comment was 24-3-D Laborato Parameters Name of Certified Lab ACZ Lab Reference # L51554-08 Sam le Date 6/6/2005 Lab Test Date 6/9-6/29 Sam led B Alkalini Total CaCO3 m /I 622 Aluminum, dissolved m /I 0.73 Anions me l1 12.6 Arsenic, dissolved m /I Arsenic, total m /I 0.0018 Bicarbonate m /I 552 Boron, dissolved m /I 0.12 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 76.0 Carbonate m /I 70 Cation -Anion Balance m /I -0.8 Cations me /I 72.6 Chloride m /I Conductivi umhos/cm 7130 Co er, dissolved m /I -0.07 Hardness m /I 76 H droxide m /I -2 Iron, dissolved m /I 0.65 Iron, total m /I 6.62 Lead, dissolved m /I -0.04 Ma nesium, dissolved m /I 8.7 Man anese, dissolved m !I 0.036 Man anese, total m /I 0.106 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.07 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.02 Nitrite as N ,dissolved m /I H SU 8.8 Phos hate m /I 0.72 Phos horns Ortho ,dissolved m /I 0.04 Potassium, dissolved m /I 7.9 Selenium, total m /I -0.001 Sodium Absor lion Ratio SAR talc. 12.30 Sodium, dissolved m A 246 Sulfate m !I 70 TDS Ratio talc. 7'02 TDS Calc. m /I 693 TDS m /l 770 TSS m /l 150 Zinc, dissolved mgll -6.61 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-2 2005 Annual Hydrology Report HydroGeo, Inc.