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South Prong Creek Surface Water quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location South Pron Creek Baseline 2005 Water Year Descri [ion Units Minimum Maximum Mean 5/9/2005 6/6/2005 10/1/2005 Field Parametere' Flaw cis Tao rear B6 NM Eleclncal Conductivity µmhos/cm 195 t to H SU 7.68 7.25 Tem erature °C °C Tem erature °F °F 5z.7 aas Comment Laboreto Parameters Name of Certifietl Lab ACZ ACZ Lab Reference # L51003-07 L5ta88-07 Sam le Date 5/9/2005 8/8/2005 Lab Test Date 5/12-5/27 fi/9-7/5 Sam led B Alkalinity Total CaCO~) mgA 86 39 Aluminum, dissolved m A O.Oa O.oa Anions me /I 1.7 0.7 Arsenic, dissolved m /I Arsenic, total m A 0.0007 -0.0005 Bicarbonate m /I Bfi 39 Boron, dissolved m /I 0.01 -0.07 Cadmium, dissolved m /I -0.005 -0.005 Calcium, dissolved m /I 17.3 to.0 Carbonate m /I -2 -2 Cation -Anion Balance m /1 2.9 12.5 Cations me /I 1.e o.s Chloride m /I 1 -1 Conducivity µmh05/cm 174 83 Co er, tlissolvetl m /I -0.01 -o.ot Hardne55 m /I fit 35 H droxide m /I -2 -2 Iron, dissolved m /I 0.07 0.10 Iron, total m /I 2.43 7.22 Lead, tlissolved m /I -0.04 -0.04 Lead, total m /I Ma nesium, tlissolvetl m fl 4.4 2.3 Man anese, tlissolvetl m /I O.o67 -0.005 Man anese, total m /I 0.080 0.022 Mercu ,total m ll -0.0002 -0.0002 Mol bdenum, dissolved m /I -o.ot -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.07 0.11 Nitrite as N ,dissolved m /I H SU 7.g 8.0 Phos hate m A 0.09 0.06 Phos horns Ortho dissolved m /I 0.03 0.02 Potassium, dissolved m /I 1.0 0.5 Selenium, dissolved m /I Selenium, total m /I -0.001 -0.001 Sodium Abso lion Ratio SAR talc. 0.75 0.36 Sodium, tlissolvetl m /I 13.4 4.9 Sulfate m /I -10 -10 TDS Ratio Calc. 1.35 1.46 TDS Calc. m A 6s at TDS m /I t2o eo TSS m A 46 22 Zinc, dissolved mg/I -0.01 -o.Ot ACZ -ACZ Laboratories, Inc., Steamboat S do s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West Elk Mlne C-22 2005 Annual Hydrology Report HydroGeo, Inc.