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SPrtng 27-1 Water Quality and fleltl Parameters C • ~~ J Mountain Coal West Elk Mine Monitorin Location Spring 27.7 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/5/2005 6/10/2005 9/20/2005 Field Parameters Flow m 8.32 5.22 1.36 Electrical CondUCtiviry µmhos/CRI 290 480 384 593 972 730 H SU 7.9 8.6 8.2 6.75 6.78 7.74 Tem erature C) °C 3.6 14.2 9.8 Tem erature (°F °F 46.6 44.2 57.0 Comment Laborato Parameters Name of Certifed Lab ACZ Lab Reference # L51623-04 Sam le Date 6/10/2005 Lab Test Date 6/13-7/1 Sam led 8 Alkalinity (Total CaCO3) mg4 136 290 189 Aluminum, dissolved m /I Anions me 4 3.9 4.5 4.2 Arsenic, dissolved m A Arsenic, total m /I Bicarbonate m /I 136 290 168 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, tli55olved m /I 19.9 29.4 24.4 Carbonate m A 7 0.9 Callon -Anion Balance % 1.3 4.3 2.8 Cations me fl 4 4.9 4.45 Chloride m ll 2 6 3 Conductivi µmh05/Cm 388 437 403 577 Co er, dissolved m 11 Hardness m fl 64 122 85 H droxide m /I Iron, dissolved m /I 0.02 0.01 -0.01 Iron, total m fl 0.18 9.15 1.68 0.06 Lead, dissolved m fl Ma nesium, dissolved m A 4.5 7.8 5.77 Man anese, dissolved m A Man anese, total m /I 0.192 0.037 Mercu ,total m A Mol btlenum, dissolved m /I Nitrate as N m /I 0.4 0.08 Nitrate/Nitrite as N m A 0.4 0.08 Nitrite as N m ll H SU 7.6 8.2 7.8 7.3 Phos hate m I Phos horns Ortho ,dissolved m /I 0.022 0.003 Potassium, dissolvetl m /I 1 1.2 1.1 Selenium, dissolved m /I Selenium, total m /I Sodium Abso tion Ratio SAR talc. 2.91 4.98 3.4 Sodium, dI5501ved m /I 57.2 74.5 66.7 Sulfate m /I 30 80 57 TDS Ratio talc. TDS Calc. m /I TDS m /I 210 300 252 350 TSS m /I 96 42 10 Zinc, dissolved mg/I ACZ Laborato , Steamboat S rin s, Colorado Ne alive values denote readin s below lab detection levels NA - not a licable NM -not measured NR -not re orted West Elk Mlne E-8 2005 Annual Hydrology Report HydroGeo, /nc.