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Spring G-7 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Spring G-7 Baseline 2003 Water Year Descri tion Units Minimum Maximum Mean 4/10/2003 6/3/2003 9/27/2003 Field Parameters FIOw m 1.35 1.72 0.47 Electrical Conductivi umhos/cm 690 733 658 H SU 8.25 7.56 7.53 Tem erature oC 45 46.9 48.6 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L41471-OS Sam le Date 6/3/2003 Lab Test Date 6/4-8/17 Sam led B Alkalini Total CaCO3 m /I 216 Aluminum, dissolved m /I 0.05 0.05 0.05 -0.03 Anions me /I 5.8 Arsenic, total m /I 0.0006 Bicarbonate m !I 177 184 180.5 216 Boron, dissolved m A 0.02 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /l 41.8 41.8 41.8 25 Carbonate m /I -2 Cation-Anion Balance m /I -6.4 Cations me /I 5.1 Chloride m /I 1 0.5 2 Conductivi umhos/cm 387 414 400.5 555 Co er, dissolved m /I -0.01 Hardness m !I 134 142 138 91 H droxide m fl -2 Iron, dissolved m 11 0.04 0.07 0 -0.01 Iron, total m /I 0.35 0.4 0.375 0.23 Lead, dissolved m /I 0.02 0.01 -0.0001 Lead, total Ma nesium, dissolved m /I 6.8 7.2 7 6.9 Man anese, dissolved m /I -0.005 Man anese, total m /I 0.005 0.006 0 -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m A -0.07 Nitrate/Nitrite as N m /I 0.08 0.1 0.09 0.15 H SU 7.8 8.1 7.95 8.1 Phos hate m /I -0.03 Phos horns Ortho ,dissolved m /I 0.014 0.007 -0.01 Potassium, dissolved m fl 1.2 Selenium, total m /I -0.001 Sodium Abso lion Ratio SAR talc. 1.54 1.63 1.6 3.41 Sodium, dissolved m (I 42.8 42.8 42.8 73.9 Sulfate m /I 40 50 45 70 TDS Ratio talc. 1.1 TDS Calc. m A 309 TDS m /I 230 230 230 340 TSS m /I 10 30 20 6 Zinc, dissolved m /I -0.01 ACZ -ACZ Laborato Steamboat S rin s Colorado ' Standard is for reference ur oses onl NA - not a lipble NM -not measured NR -not re orted NI -new inflow West Elk Mine E-1 2003 Annual Hydrology Report HydroGeo, /nc.