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Middle Sylvester Gulch <br />Surface Water Quality and Field Parameters <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location M. Sylvester Gulch Flume Baseline' 2009 Water Year <br />Description Units Minimum Maximum Mean 5/8/2009' 6/2/2009' Q ° 8/10/2009' Q <br />Field Parameters <br />Flow Staff Gauge 0.46 0.30 0.09 <br />Electrical Conductivity umhos/cm 790 877 943 <br />H SU 8.77 8.78 8.81 <br />Temperature C C 11.8 10.6 12.9 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab ACZ ACZ <br />Lab Reference # L76166-03 L77413-06 <br />Sample Date 6/2/2009 8/10/2009 <br />Lab Test Date 6/3-6/12 8/11-8/24 <br />Sampled B PH PH <br />Alkalinity Total CaC03 mg/1 346 382 <br />Aluminum, dissolved m /I -0.03 U -0.03 U <br />Anions me /I 9.1 10.4 <br />Arsenic, total m /I -0.0005 U -0.0005 U <br />Bicarbonate m /I 448 310 315 324 <br />Boron, dissolved m /I 0.09 0.14 <br />Cadmium, dissolved m /I -0.005 U -0.005 U <br />Calcium, dissolved m /I 42.5 30.6 <br />Carbonate m /l 30 57 <br />Cation - Anion Balance % 1.6 1.4 <br />Cations me /I 9.4 10.7 <br />Chloride m /I 3 10 5 16 24 <br />Chromium, total m /I -0.01 U -0.01 U <br />Conductivity umhos/cm 480 800 606 814 887 <br />Copper, dissolved m /I -0.01 U -0.01 U <br />Cyanide, total m /I -0.003 U -0.003 U <br />Hardness m /I 159 234 194 201 193 <br />Hydroxide m /I -2 U -2 U <br />Iron, dissolved m /I 0.4 0.1 -0.02 U 0.02 B <br />Iron, total /1 <br />m 0.05 10.5 2.0 2.51 0.45 <br />Lead, dissolved m /I -0.04 U -0.04 <br />U <br />Magnesium, dissolved m /I 23.0 28.2 <br />Manganese, dissolved m /I -0.005 U -0.005 U <br />Manganese, total m /I 0.56 0.05 0.059 0.006 B <br />Mercury, total m /I -0.0002 U -0.0002 U <br />Molybdenum, dissolved m /I -0.01 U -0.01 U <br />Nickel, total m /I -0.01 U -0.01 U <br />Nitrate/Nitrite as N m /I 0.08 0.02 0.09 B -0.02 U <br />H lab SU 7.35 8.70 8.08 8.6 H 8.8 H <br />Phosphate m /I -0.03 U 0.03 B <br />Phosphorus Ortho , dissolved m /I 0.875 0.110 -0.01 UH 0.01 B <br />Potassium, dissolved m /l 2.5 2.7 <br />Selenium, total m /I 0.0008 0.0004 B <br />Silver, total m /I -0.00005 U -0.00005 U <br />Sodium Absorption Ratio SAR ca1c. 2.29 3.02 2.70 3.76 4.85 <br />Sodium, dissolved m A 121 153 <br />Sulfate m /I 28.2 80 46.1 85 11 101 <br />TDS Ratio calc. 1.00 0.96 <br />TDS Calc. m /I 509 591 <br />TDS m /I 3.68 584 381 510 570 <br />TSS m /I 4.2 5740 419 91 8 B <br />Zinc, dissolved mg/I -0.01 U 0.03 B <br />1 Baseline and WY 2000 data adapted from WINE (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 />C-4 2009 Annual Hydrology Report HydroGeo, Inc.