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Spring 26-1 Water Quality and Field Parameters • • i• Mountain Coal West Elk Mine Monitoring Location Spring 26-t Baseline 2002 water Year Descri lion Units Minimum Maximum Mean 4/29/2002 6/19/2002 9/27/2002 Field Parameters Flow m 1.5 0.3 0.75 Electrical Conductivi umhos/cm 240 640 482 438 537 721 H SU 7.3 8.1 7.7 6.99 7.62 7.74 Tem erature OC 1.4 7.2 6 14.3 10.2 7.8 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L37330-04 Sam le Date 6/19/2002 Lab Test Date 6/21-7/14 Sam led B GV Alkalini Total CaCO3 m /I 151 284.000 222.000 164 Aluminum, dissolved m /I 0.04 Anions me /I 5.1 5.9 5.5 4.2 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 Bicarbonate m /I 151 284 222 164 Boron, dissolved m /I 9.03 Cadmium, dissolved m /I -0.003 Calcium, dissolved m /I 24 37.2 31.5 33.9 Carbonate m /I -2 Cation -Anion Balance m /I 1 3.3 2.15 9.7 Cations me /I 5.2 6.3 5.75 5.1 Chloride m /I 2 6 4.4 3 Conductivit umhos/cm 480 548 514 454 Co er, dissolved m /I -0.01 Hardness m /I 81 126 105 111 H droxide m /I -2 Iron, dissolved m /I 0.08 Iron, total m /I 1.45 0.24 0.75 Lead, dissolved m /I 0.0012 Ma nesium, dissolved m /I 5.1 8 6.7 6.4 Man anese, dissolved m /I -0.005 Man anese, total m /I 0.028 0.004 0.013 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate/Nitrite as N m /I 0.14 0.31 0.19 0.06 H SU 7.1 7.7 7.4 7.4 Ph05 hate m /I -0.03 Phos horns Ortho ,dissolved m /I 0.007 0.001 -0.005 Potassium, dissolved m /I 1.2 1.4 1.3 1.2 Selenium, total m /I 0.001 0.001 -0.002 Sodium Absor lion Ratio SAR talc. 2.8 4.96 3.96 2.76 Sodium, dissolved m /I 57.2 125 94.5 66.2 Sulfate m A a0 80 63.1 40 TDS Ratio talc. TDS Calc. m /I TDS m /I 220 410 327 280 TSS m /I 16 4 18 Zinc, dissolved m /I 0.02 0.01 -0.01 ACZ -ACZ Laborato Steamboat S rin s Colorado "Standard is for reference u oses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine E-70 2002 Annual Hydrology Report HydroGeo, Inc.