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Spring G-7 Water Quality and Field Parameters ~J • Mountain Coal West EIk Mine Monitoring Location Spring G-7 Baseline 2002 Water Year Desori lion Units Minimum Maximum Mean 4/30/2002 6/18/2002 9/26/2002 Field Parameters Flow m 1.69 1 0.7 Electrical Conductivi umhos/cm 619 677 743 ry SU 7.9 7.85 7.78 Tem erature oC 16.1 10.2 9.2 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L37347-01 Sam le Date 6/18/2002 Lab Test Date 6/29-7/21 Sam led B GV Alkalini Total CaCO3 m /I 226 Aluminum, dissolved m /I 0.05 0.05 0.05 0.17 Anions me /I 6.3 Arsenio, total m /I -0.0005 Bicarbonate m /I 177 184 180.5 228 Boron, dissolved m /I 0.03 Cadmium, dissolved m /I -0.003 Calcium, dissolved m /I 41.8 41.8 41.8 27.8 Carbonate m /I -2 Cation -Anion Balance m /I 2.3 Cations me /I 6.6 Chlodde m /I t 0.5 3 Conductivi umhos/cm 387 414 400.5 572 Co er, dissolved m /I -0.01 Hardness m /I 134 142 138 96 H droxide m /I -2 Iron, dissolved m /I 0.04 0.07 0 0.23 Iron, total m /I 0.35 0.4 0.375 0.75 Lead, dissolved m /I O.oz 0.01 Lead, total 0.001 Ma nesium, dissolved m /I 6.8 7.2 7 6.4 Man anese, dissolved m /I 0.007 Man anese, total m Fl 0.005 0.006 0 0.02 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate/Nitrite as N m /I 0.08 0.1 0.09 0.02 H SU 7.8 8.1 7.95 7.9 Phos hate m /I 0.03 Phos horns Ortho ,dissolved m /I 0.014 0.007 0.011 Potassium, dissolved m /I 1.5 Selenium, total m /I -0.002 Sodium Absor lion Ratio SAR talc. 1.54 1.63 1.6 4.72 Sodium, dissolved m /I 42.8 42.8 42.8 105 Sulfate m /I 40 50 45 SO TDS Ratio talc. TDS Calc. m /I TDS m /I 230 230 230 360 TSS m /I 10 30 20 26 Zinc, dissolved m /I 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 orted NI -new inflow West Elk Mine E-1 2002 Annual Hydrology Report HydroGeo, Inc.