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Lower Minnesota Creek (USGS) <br />Surface Water Quality and Field Parameters <br /> <br />11 <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location L. Minnesota Ck (USGS) Baseline 2008 Water Year <br /> <br />Description Units Minimum Maximum Mean 5/5/2008 6/7/2008 8/23/2008 <br />Field Parameters <br />Staff Gauge <br />1.18 <br />2.45 <br />1.40 <br />Flow <br />Electrical Conductivity umhos/cm 382 198 183 <br /> SU 8.02 8.12 8.17 <br />H <br />Temperature (°C) <br />°C <br />12.7 <br />12.0 <br />17.4 <br />Comment <br />Laboratory Parameters' <br />Name of Certified Lab 2 Enviro-Chem <br /> <br /> 08/952 <br />Lab Reference # x/7/2008 <br />Sample Date 6/9-7/3 <br />Lab Test Date P. Holder <br />Sampled B <br />Alkalinity Total CaC03 m /I <br />Aluminum, dissolved m /l <br />Anions me /I <br />Arsenic, dissolved m /I <br />total <br />Arsenic m /I <br />, <br />Bicarbonate m /I 46 75 60 <br />Boron, dissolved m /I <br />dissolved <br />Cadmium m /I <br />, <br />Calcium, dissolved m /I 19.6 19.6 19.6 <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /1 <br />Chloride m /I <br />mhos/cm <br />152 2 <br />803 1 <br />350 <br />165.74 <br />Conductivity u <br />Copper, dissolved m /I <br />Hardness m /I 65 106 82 <br />Hydroxide m /I <br />m /I <br />0.23 <br />0.58 <br />0.41 <br />0.06 <br />Iron, dissolved m /I 0.45 82 8.9 6.37 <br />Iron, total <br />dissolved <br />Lead m q/1 <br />, <br />Magnesium, dissolved m /I 6.1 8.7 7.4 <br />Manganese, dissolved m /l 0.013 0.015 0.014 <br />Manganese, total m /I 0.018 1.83 0.188 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N), dissolved m /I <br />Nitrate/Nitrite as N m /I <br />Nitrite as N), dissolved m /I <br />7 <br />47 <br />H lab SU . <br />Phosphate m /I <br />Phosphorus Ortho), dissolved m /I <br />Potassium, dissolved m /I <br />Selenium, dissolved m /l <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 0.3 0.5 0.4 <br />Sodium, dissolved m /I 7.7 7.7 7.7 <br />Sulfate m /I 20 50 40 <br />TDS Ratio talc. <br />TDS Calc. m /I <br />m /I <br />100 <br />584 <br />231 <br />156 <br />TDS <br />TSS m /I 16 1300 292 119 <br />Zinc, dissolved mg/I <br /> <br />Baseline and WY 2000 data adapted from WWE (2001). <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />3 Zero values denote readings below lab detection levels (MDL). <br />West Elk Mine <br />C-6 2008 Annual Hydrology Report HydroGeo, Inc.