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Spring 15.1 Water duality and Field Parameters • • Mountain Coal West EIk Mine Monitorin Location Spring 15.1 Baseline 2005 Water Year Descd lion Units Minimum Maximum Mean 5/2/2005 6/4/2005 9/14/2005 Field Parameters Flow m 0.73 No flow D Electrical Conductivity µmhos/Cm 1060 1240 7737 7410 7590 H SU 7.4 8.6 8.2 7.38 8.9 Tem erature (°C °C 1.1 12.8 e Tem erature (°F °F 60 50.7 Comment Laborato Parameters Name of Certifed Lab ACZ Lab Reference # L57498-03 Sam le Date 6/4/2005 Lab Test Date s/8-7/i Sam led B Alkalinity (Total CaCO~) mgA 375 520 480 Aluminum, dissolved m /I Anions me /I 0.5 0.09 Arsenic, dissolved m /l Arsenic, total m /l 0.001 0.001 Bicarbonate m fl 364 520 477 Boron, dissolved m /I Cadmium, dissolved m /I 0.004 0.0005 Calcium, total m fl 0.004 0.0005 COICiUm, di55olved m /I 44.9 67.8 58.3 Carbonate m /I t2 2.2 Cation -Anion Balance m /I -5.e 3.8 a Cations me /I 12.1 14.4 13.3 Chloritle m ll a s 6.3 Conq UClivll µmhos/Cm 1080 1120 1100 1430 Co er, dissolved m /I 0.01 0.01 Hardness m fl 222 307 271 H droxide m /I Iron, dissolvetl m /I 0.01 0.01 0.02 Iron, total m /I 0.01 0.73 0.12 0.95 Lead, dissolved m /I Ma nesium, tlI9501vetl m A 25.8 33.4 30 Man anese, dissolved m fl Man anese, total m fl 0.022 0.001 Mercu ,total m fl Mo bdenum, dissolved m /t Nitrate as N m ll Nitrate/Nitrite as N m /1 0.08 0.18 0.11 Nitrite as N m /I H SU 7.9 8.2 8.1 7.9 Phos hate m ~ Phos horns Onho ,dissolved m fl 0.009 0.001 Potassium, drss0lvetl m I 2.8 3.2 3 Selenium, total m fl 0.002 0.001 Sodium Abso lion Ratio SAR talc. 4.67 5.3a a.ss Sodium, dissolved m /1 163 200 185 Sulfate m /I 140 180 157 TDS Ratio talc. TDS Calc. m fl TDS m /I ss0 730 701 940 TSS m /I 26 s ae Zinc, dissolved m /I 0.07 0.01 Zinc, total mg/I O.oS 0.02 ACZ Laborato , Steamboat S do s, Coloratlo Ne alive values denote reatlin s below lab detection levels NA - not a livable NM -not measured NR -not re oned West Elk Mine E-17 2005 Annual Hydrology Report NydroGeo, inc.