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Lower Minnesota Creek (USGS) <br />Surface Water Quality and Field Parameters <br />• <br />• <br />C-6 <br />Mountain Coal West Elk Mine <br />Monitoring Location L. Minnesota Ck (USGS) Baseline' 2009 Water Year <br />Description Units Minimum Maximum Mean 5/8/2009 6/3/2009 Q ° 8/11/2009 <br />Field Parameters <br />Flow Staff Gauge 2.5' 2.1' 1.32' <br />Electrical Conductivity umhos/cm 188 192 180 <br />H SU 8.23 8.26 8.26 <br />Temperature °C °C 8.4 7.9 18.7 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 ACZ <br />Lab Reference # L76236-03 <br />Sample Date 6/3/2009 <br />Lab Test Date 6/5-6/15 <br />Sampled B PH <br />Alkalinity Total CaC03 m /I <br />Aluminum, dissolved m /I <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I 46 75 60 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I 19.6 19.6 19.6 <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /I <br />Chloride m /I 2 1 <br />Conductivity umhos/cm 152 803 350 175 <br />Copper, dissolved m /I <br />Hardness m /I 65 106 82 <br />Hydroxide m /I <br />Iron, dissolved m /I 0.23 0.58 0.41 0.07 <br />Iron, total m /I 0.45 82 8.9 1.9 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I 6.1 8.7 7.4 <br />Manganese, dissolved m /I 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 />H lab SU 8.3 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I <br />Potassium, dissolved m /I <br />Selenium, dissolved m /I <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 calc. <br />TDS Calc. m /I <br />TDS m /I 100 584 231 110 <br />TSS m /I 16 1300 292 16 B <br />Zinc, dissolved mg/I <br />' Baseline and WY 2000 data adapted from WWE (2001). <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels. <br />4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />2009 Annual Hydrology Report HydroGeo, Inc.