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Spring G-20 Water Quality and Field Parameters J J I• Mountain Coal West Elk Mine Monitoring Location Spring G-20 Baseline 2002 Water year Descri lion Units Minimum Maximum Mean 4/23/2002 6/18/2002 9/26/2002 Field Parameters Flow m 0.75 0.38 0.4 Electrical Conductivi umhos/cm 931 588 941 H SU 8.19 8.27 7.74 Tem eratu re oC 16.7 21.7 9.7 Comment We[, Not Sam led Laborato Parameters Name of Certified Lab ACZ Lab Reference # L38680-06 Sam le Date 9/26/2002 Lab Test Date 9/28-10/18 Sam led B GV Alkalinit Total CaCO3 m /I 369 Aluminum, dissolved m /I -0.03 Anions me /I 8.7 Arsenic, dissolved m /I Arsenic, total m /I -0.001 Bicarbonate m /I 452 657 539 369 Boron, dissolved m /I Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 81 81 61 36.1 Carbonate m /I -2 Cation -Anion Balance m /I -i.6 Cations me /I 8.4 Chloride m /I 1.2 10 5.3 10 Conductivi umhos/cm 970 1090 1023 782 Co er, dissolved m /I -0.01 Hardness m /I 193 416 318 200 H droxide m /I -2 Iron, dissolved m /I 0.05 0.01 0.11 Iron, total m /I 0.32 0.05 2.93 Lead, dissolved m /I -0.04 Ma nesium, dissolved m /I 33.3 33.3 33.3 26.6 Man anese, dissolved m /I 0.002 0.002 0.002 0.022 Man anese, total m /I 0.06 0.005 0.613 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m A -0.01 Nitrate as N m /I Nitrate/Nitrite as N m /I 0.01 0.05 0.03 -0.02 Nitrite as N m 11 H SU 7 8.1 7.7 7.8 Phos hate m /I Phos horns Ortho ,dissolved m /I 0.15 0.02 -0.01 Potassium, dissolved m /I 32 Selenium, total m /I -0.001 Sodium Absor lion Ratio SAR talc. 2.31 2.73 2.52 310 Sodium, dissolved m /I 102 102 102 99.6 Sulfate m /I 16 117 81 50 TDS Ratio talc. TDS Calc. m /I TDS m /I 502 686 598 440 TSS m I 19.6 3.5 216 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 EIk Mine E-13 2002 Annual Hydrology Repoli HydroGeo, /nc.