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Spring 26-1 Wa[er Quality and Field Parameters • C~ • Mountain Coal West Elk Mine Monitoring Location Spring 26-1 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/5/2005 6/10/2005 10/2/2005 Field Parameters Flow m 64 8.45 0.49 Electrical Conductivity µmhos/cm 240 640 482 541 914 588 H SU 7.3 8.1 7.7 6.9 7.07 6.94 Tem erature °C) °C 1.4 7.2 6 Tem erature °F) °F 43.7 43.3 51.0 Comment Laborato Parameters Name of Certifed Lab ACZ Lab Reference # L51623-05 Sam le Date 6/70/2005 Lab Test Date 6/13-7/1 Sam led B Alkalinity (Total CaCO,) mg/I 151 284 222 Aluminum, dissolved m /I Anions me /I 5.1 5.9 5.5 Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 157 264 222 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 24 37.2 31.5 Carbonate m /I Cation -Anion Balance % 1 3.3 2.15 Cations me /I 5.2 6.3 5.75 Chloride m /I 2 6 4.4 Conductivity µmhos/cm 480 548 514 526 Co er dissolved m /l Hardness m /I 81 126 105 H droxide m /I Iron, dissolved m /I 0.03 Iron, total m /I 1.45 0.24 2.50 Lead, dissolved m /I Ma nesium, dissolved m /I 5.1 8 6.7 Man anese, dissolved m /I Man anese, total m 11 0.028 0.004 Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.14 0.31 0.19 Nitrite as N ,dissolved m /I H SU 7.1 7.7 7.4 7.6 Phos hate m /I Phos horns Ortho ,dissolved m /1 0.007 0.001 Potassium, dissolved m /I 1.2 1.a 1.3 Selenium, dissolved m /I Selenium, total m /I 0.001 0.001 Sodium Abso lion Ratio SAR talc. 2.8 4.96 3.96 Sodium, dissolved m /I 57.2 125 94.5 Sulfate m /I a0 80 63.1 TDS Ratio talc. TDS Calc. m /1 TDS m /I 220 410 327 340 TSS m /I is 4 2a Zinc, dissolved mg/I 0.02 0.01 ACZ Laborato , Steamboat S tin 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 Mine E-6 2005 Annual Hydrology Report HydroGeo, Inc.