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South Prong Creek <br />WY 2005 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location <br />South Prong Creek Baseline <br />2005 Water Year <br />Description <br />Units Minimum Mapmum <br />Mean 5/9/2005 <br />6/6/2005 10/1/2005 <br />Field Parameters' <br />Flow <br />cfs <br />Too great <br />86 NM <br />Electrical Conductivity <br />µmhos/cm <br />195 <br />118 <br />H <br />SU <br />768 <br />725 <br />Temperature °C <br />°C <br />Temperature °F <br />OF <br />527 <br />449 <br />Comment <br />Laboratory Parameters 2 <br />Name of Certified Lab 3 <br />ACZ <br />ACZ <br />Lab Reference # <br />L51003-07 L51488-07 <br />Sample Date <br />5/9/2005 <br />6/6/2005 <br />Lab Test Date <br />5/12-5/21 <br />6/9-7/5 <br />Sarnriled B <br />Alkalinity (Total CaCO3) <br />mg/I <br />86 <br />39 <br />Aluminum, dissolved <br />m /I <br />0.04 <br />0.04 <br />Anions <br />m /I <br />1.7 <br />0.7 <br />Arsenic, dissolved <br />m /I <br />Arsenic, total <br />m /I <br />00007 <br />-0.0005 <br />Bicarbonate <br />m /I <br />86 <br />39 <br />Boron, dissolved <br />m /I <br />001 <br />-0.01 <br />Cadmium, dissolved <br />m /I <br />-0.005 <br />-0.005 <br />Calcium, dissolved <br />m /I <br />173 <br />100 <br />Carbonate <br />m /I <br />-2 <br />-2 <br />Cation - Anion Balance <br />m /I <br />2.9 <br />125 <br />Cations <br />m /I <br />1.8 <br />0.9 <br />Chloride <br />m /I <br />1 <br />-1 <br />Conductivity <br />µmhos/cm <br />174 <br />83 <br />Copper, dissolved <br />m /I <br />-0.01 <br />-001 <br />Hardness <br />m /I <br />61 <br />35 <br />Hydroxide <br />m /I <br />-2 <br />-2 <br />Iron, dissolved <br />m /I <br />0.07 <br />010 <br />Iron, total <br />m /I <br />243 <br />1 22 <br />Lead, dissolved <br />m /I <br />-004 <br />-0.04 <br />Lead, total <br />m /I <br />Magnesium, dissolved <br />m /I <br />44 <br />2.3 <br />Manganese, dissolved <br />m /I <br />0 007 <br />-0005 <br />Manganese, total <br />m /I <br />0 060 <br />0 022 <br />Mercury, total <br />m /I <br />-0.0002 <br />-0.0002 <br />Molybdenum, dissolved <br />m /I <br />-001 <br />-0.01 <br />Nitrate as N), dissolved <br />m /I <br />Nitrate/Nitrite as N <br />m /I <br />007 <br />0 11 <br />Nitrite as N), dissolved <br />m /I <br />H <br />SU <br />7.9 <br />8.0 <br />Phosphate <br />m /I <br />0.09 <br />0.06 <br />Phosphorus (Ortho), dissolved <br />m /I <br />0.03 <br />0.02 <br />Potassium, dissolved <br />m /I <br />1 0 <br />05 <br />Selenium, dissolved <br />m /I <br />Selenium, total <br />m /I <br />-0.001 <br />-0.001 <br />Sodium Absorption Ratio (SAR) <br />calc. <br />0.75 <br />036 <br />Sodium, dissolved <br />m /I <br />13.4 <br />4.9 <br />Sulfate <br />m /I <br />-10 <br />-10 <br />TDS Ratio <br />calc. <br />1.35 <br />1.46 <br />TDS Calc. <br />m /I <br />89 <br />41 <br />TDS <br />m /I <br />120 <br />60 <br />TSS <br />m /I <br />46 <br />22 <br />Zinc, dissolved <br />m /I <br />1 -0011 <br />-0.01 <br />Baseline data to be collected at least 1 year prior to any mining activities. <br />Z Negative values denote readings below lab detection levels <br />3 ACZ Laboratory, Steamboat Springs, CO. <br />West Elk Mine <br />B-8 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />