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Spring '13.2 Water quality and Field Parameters • • Mountain Coal West EIk Mine Monitoring Location Spring 13-2 Baseline 2005 water Year Descri ti0n Units Minimum Maximum Mean 5/11/2005 6/6/2005 9/19/2005 Field Parameters Flow m n.e s.o1 o.1a Electrical Conductivity µmhos/cm 497 583 620 H $U 6.63 6.78 7.24 Tem erature °F a2.5 a5.4 49.0 Comment was 24-3-C Laborato Parameters Name of Certified Lab ACZ Lab Reference # L51554-07 Sam le Date 6/6/2005 Lab Test Date 6/9-s/zs Sam led B Alkalinity (Total CaCO~) mg/I 155 Aluminum, dissolved m /I -0.03 Anions me /I 3.7 Arsenic, dissolvetl m /I Arsenic, total m /I -O.oooS Bicarbonate m /I 155 Boron, dissolved m /I 0.02 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 37.0 Carbonate m /I '2 Cation -Anion Balance m A 1.3 Cations me /I 3.a Chloride m ll 2 Conductivity µmho5/cm 375 Co er, dissolvetl m /I -0.01 Hardness m /I 12a H droxide m /I -2 Iron, dissolved m /I 0.02 Iron, total m /I 0.04 Lead, dissolved m /I -0.04 Ma nesium, dissolved m !I a.7 Man anese, dissolved m /I -0.005 Man anese, total m /I -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0'11 Nitrite as N ,dissolved m /I H SU a.1 Phos hate m !I -0.03 Phos horns Ortho ,dissolved m /I -0.01 Potassium, dissolved m !I 1.4 Selenium dissoloved m /l Selenium total m /I -o.oot Sodium Abso lion Ratio SAR Gala 1.13 Sodium, dissolved m /1 29.0 Sulfate m /I 30 TDS Ratio cola 1.14 TDS Calc. m /l zo1 TDS m /l 230 TSS m /I a Zinc, dissolved mg/I -0.01 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 Mine E-3 2005 Annual Hydrology Report HydroGeo, Inc.