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Spring 27-1 Water (luality and Field Parameters ~I • • Mountain Coal West EIk Mine Monitoring Location Spring 27-1 Baseline 2002 Water Year Descri lion Units Minimum Maximum Mean 4/29/2002 6/19/2002 9/27/2002 Field Parameters Flow m 0.53 0.37 0.33 Electrical Conductivit umhos/cm 290 460 364 606 756 852 H SU 7.9 8.6 8.2 7.83 7.7 7.58 Tem erature oC 3.6 14.2 9.8 17.6 9.9 8.1 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L37330-05 Sam le Date 6/19/2002 Lab Test Date 6/20-7/14 Sam led B Gv Alkalini otal CaCO3 m /I 136 290 169 200 Aluminum, dissolved m /I -0.03 Anions me /I 3.9 4.5 4.2 6.0 Arsenic, dissolved m /I Arsenic, total m A -0.0005 Bicarbonate m /I 136 290 168 200 Boron, dissolved m /I 0.03 Cadmium, dissolved m /I -0.003 Calcium, dissolved m ll 19.9 29.4 24.4 37.6 Carbonate m /I 7 0.9 -2 Cation -Anion Balance m /I 1.3 4.3 2.8 7.0 Cations me /I 4 4.9 4.45 6.9 Chloride m /I 2 6 3 7 Conductivi umhos/cm 368 437 403 613 Co er, dissolved m /I -0.01 Hardness m /I 64 122 65 129 H droxide m /I -2 Iron, dissolved m /I 0.02 0.01 0.03 Iron, total m /I 0.16 9.15 1.68 0.71 Lead, dissolved m /I 0.0007 Ma nesium, dissolved m /I 4.5 7.8 5.77 8.6 Man anese, dissolved m A -0.005 Man anese, total m /I 0.192 0.037 0.015 Mercu ,total m ll -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N m /I 0.4 o.oe Nitrate/Nitrite as N m /I 0.4 0.08 0.08 Nitrite as N m /I H SU 7.6 8.2 7.9 8.1 Phos hate m /I 0.06 Phos horns Ortho ,dissolved m /I 0.022 0.003 0.021 Potassium, dissolved m /I 1 1.2 1.1 1.6 Selenium, total m /I -0.002 Sodium Absor lion Ratio SAR talc. 2.91 4.98 3.4 3.79 Sodium, dissolved m /I 57.2 74.5 66.1 98 Sulfate m /I 30 80 57 90 TDS Ratio talc. TDS Calc. m /I TDS m /I 210 300 252 400 TSS m /I 96 a2 40 Zinc, dissolved m /I -0.01 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 West Elk Mine E-17 2002 Annual Hydrology Report HydroGeo, Inc.