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Spring G-24 Water Quality and Field Parameters • • Mountain Coal West EIk Mine Monitoring Location Spring G-24 Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/10/2003 6/2/2003 9/23/2003 Field Parameters Flow m 0.65 0.85 0.31 Electrical Conductivit umtwslcm 1240 1187 1193 H SU 7.56 7.38 7.1 Tem erature oC 45.3 45.7 52.2 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L41 so7-13 Sam le Date 6/5/2003 Lab Test Date 6/6-6/14 Sam led B Alkalini Total CaCO3 m /I Aluminum, dissolved m /I 0.08 0.04 Anions me /I Arsenic, dissolved m h Arsenic, total m /I 0.001 0.001 0.007 Bicarbonate m /I 267 376 307 Boron, dissolved m /I Cadmium, dissolved m !I Calcium, dissolved m /I 56.4 56.4 56.4 Carbonate m /I Cation -Anion Balance m /I Cations me /I Chloride m /I 1.2 10 4.4 Conductivi umhos/cm 550 564 557 931 Co er, dissolved m /I Hardness m /I 176 233 203 H droxide m /I Iron, dissolved m /I 0.1 0.03 -0.01 Iron, total m /I 2.28 O.as 0.07 Lead, dissolved m /I Ma nesium, dissolved m /I 15.9 16.5 16.2 Man anese, dissolved m /I 0.006 0.002 Man anese, total m I 0.048 0.005 Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.05 0.1 0.08 Nitrite as N ,dissolved m /I H SU 7.2 8.3 7.9 7.5 Phos hate m /I Phos horns Ortho ,dissolved m /I O.to5 0.027 Potassium, dissolved m /I Selenium, total m /I Sodium Absor lion Ratio SAR tale 1.8 1.8 1.8 Sodium, dissolved m /I 58.9 58.9 58.9 Sulfate m /I 21.2 70 30.5 TDS Ratio talc. TDS Calc. m /I TDS m /I 214 520 362 540 TSS m /I 102 21 s Zinc, dissolved m A 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-5 2003 Annual Hydrology Report HydroGeo, Inc.