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Spring 27.1 Water t]uality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location Spring 27-1 Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/13/2003 6/4/2003 9/27/2003 Field Parameters Flow m 2 1.27 0.39 Electrical Conductivi umhos/cm 290 460 364 690 747 754 H SU 7.9 8.6 8.2 7.56 7.83 7.05 Tem erature oC 3.6 14.2 9.8 42.4 43.9 55.3 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L41507-01 Sam le Date 6/4/2003 Lab Test Date s/5-6/16 Sam led B Alkalinit otal CaCO3 m /I 136 290 169 258 Aluminum, dissolved m /I 0.07 Anions me /I 3.9 4.5 4.2 6.7 Arsenic, dissolved m /I Arsenic, total m /I -O.o005 Bicarbonate m /I 136 290 168 258 Boron, dissolved m /I O.Oa Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 19.9 29.4 24.4 28.4 Carbonate m /I 7 0.9 -2 Cation - Anlon Balance m /I 1.3 4.3 2.8 -1.5 Cations me /I 4 4.9 4.45 6.5 Chloride m /I 2 6 3 3 Conductivi umhos/cm 368 437 403 535 Co er, dissolved m /I -0.01 Hardness m /I 64 122 85 100 H droxide m /I -z Iron, dissolved m !I 0.02 0.01 0.02 Iron, total m A 0.16 9.15 1.68 0.04 Lead, dissolved m /I 0.0002 Ma nesium, dissolved m /I 4.5 7.8 5.77 7 Man anese, dissolved m /I -0.005 Man anese, total m /I 0.192 0.037 -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N m /I 0.4 0.05 0.14 Nitrate/Nitrite as N m /I 0.4 0.08 0.14 Nitrate as N m /l -0.01 H SU 7.6 8.2 7.9 7.4 Phos hate m /I Phos horns Ortho ,dissolved m /I 0.022 0.003 -0.01 Potassium, dissolved m /I 1 1.2 1.1 1.2 Selenium, total m /I -0.001 Sodium Abso lion Ratio SAR talc. 2.91 4.98 3.4 4.49 Sodium, dissolved m /I 57.2 74.5 66.1 102 Sulfate m /I 30 80 57 70 TDS Ratio talc. 0.93 TDS Ca1c. mil 367 TDS m /I 210 300 252 340 TSS m /I 96 42 -5 Zinc, dissolved m /I -0.01 ACZ -ACZ Laborato Steamboat S rin s Colorado Standard is for reference ur oses oral NA - not a livable NM -not measured NR -not re orted West Elk Mine E-10 2003 Annual Hydrology Report HydroGeo, Inc.