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Spring G-14 Water Quality and Field Parameters • • u Mountain Coal West Elk Mine Monitoring Location Spring G-14 Baseline 2005 Waler Year Descri lion Units Minimum Maximum Mean 5/2/2005 6/4/2005 9/20/2005 Fieltl Parameters Flow Electrical Conductivity m µmh05/cm 3 1366 4 1380 2.6 1023 H SU 7.23 7.06 7.08 Tem erature °C °C Tem erature °F °F 43.5 44.0 55.6 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference p L51469-OS Sam le Date 6/4/2005 Lab Test Dale 6/8-7/1 Sam led B Alkalinity (Total CaCOa) mg/I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 0.001 Bicarbonate m /I 325 484 406 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 54.9 61.4 58.2 Carbonate m /I Cation-Anion Balance m /I Cations me /I Chloride Conductivity m /I pmhos/cm 2 553 t4 682 6 637 1100 Co er, dissolved m !I Hardness m /I 215 307 257 H tlroxide m /I Iron, dissolved m /I 0.11 0.02 0.04 Iron, total m /l 3 0.1 0.02 Lead, dissolved m /l Ma ne51Um, dissolved m /I 21.5 29.8 24,6 Man anese, dissolved m /I Man anese, total m /I 0.03 0.003 Mercu ,total m /l Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.12 0.21 0.16 Nitrite as N ,dissolved m /l H SU 7.1 8.2 7.7 7.8 Phos hate m /I Phas horns Ortho ,dissolved m /I 2.08 0.15 Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /I 0.001 0.001 0.001 Sodium Absor lion Ratio SAR talc. 2.22 3.11 2.53 Sodium, dissolved m /l 81.3 114 97.7 Sulfate m /l 40 150 88 TDS Ratio talc. TDS Calc. m /I TDS m /I 324 708 489 680 TSS m /I 107 5 -5 Zinc, dissolved mg/I ACZ Laborato , Steamboat S rin s, Colorado Ne alive values denote readin s below lab detection Ieveis NA - not a licable NM -not measured NR -not re orted West Elk Mine E-12 2005 Annual Hydrology Report HydroGeo, Inc.