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Spring 15-1 Water l]uality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location Spring 15-1 Baseline 2002 Water Year Descri tlOn Units Minimum Maximum Mean 4/23/2002 6/18/2002 9/9/2002 Field Parameters Flow m Seep D D Electrical Conductivi umhos/cm 1060 1240 1137 2630 H SU 7.4 8.6 8.2 8.31 Tem erature oC 1.1 12.8 8 22.9 Comment Laborato Parameters Name of Certifed Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalini Total CaCO3 m /I 375 520 480 Aluminum, dissolved m /I Anions me /I 0.5 0.09 Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 Bicarbonate m A 364 520 477 Boron, dissolved m /I Cadmium, dissolved m /I 0.004 0.0005 Calcium, total m /I 0.004 0.0005 CelCium, dissolved m /I 44.9 67.8 58.3 Carbonate m /I 12 2.2 Cation -Anion Balance m /I -5.8 3.8 -1 Cations me /I 12.1 14.4 13.3 Chloride m /I 4 9 6.3 Conductivi umhoslcm 1080 1120 1100 Co er, dissolved m /I 0.01 0.01 Hardness m /I 222 307 271 H droxide m /I Iron, dissolved m /I 0.01 0.01 Iron, total m /I 0.01 0.73 0.12 Lead, dissolved m /I Ma nesium, dissolved m /I 25.8 33.4 30 Man anese, dissolved m /I Man anese, total m /I 0.022 O.OOt Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N m /I Nitrate/Nitrite as N m /I 0.08 O.tB 0.11 Nitrite as N m /I H SU 7.9 8.2 8.1 Phos hate m /I Phos horns Ortho ,dissolved m /I 0.009 0.001 Potassium, dissolved m /I 2.8 3.2 3 Selenium, total m /I 0.002 0.001 Sodium Absor tion Ratio SAR talc. 4.61 5.39 4.99 Sodium, dissolved m A 163 200 185 Sulfate m /I 140 180 151 TDS Ratio talc. TDS Calc. m /I TDS m /I 660 730 701 TSS m /I 26 9 Zinc, dissolved m /I O.Ot 0.01 Zinc, total m /I 0.05 0.02 ACZ -ACZ Laborato Steamboat S rin s Colorado ' Standard is for reference ur oses onl NA - not a livable NM -not measured NR -not re rted West Elk Mine E-16 2002 Annual Hydrology Report HydroGeo, Inc.