2010-06-30_REPORT - C1980007 (6)

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Upper Dry Fork Flume Surface Water Quality and Field Parameters • C Mountain Coal West Elk Mine Monitoring Location: Upper Dry Fork Flume Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5/9/2009 6/4/2009 Q 6/4/20099 a (Duplicate) Q 4 8/9/2009 Field Parameters Flow Staff Gua a 0.83' 0.47' 0.47' 0.29' Electrical Conductivity umhos/cm 88 97 97 69.7 H SU 7.87 7.90 7.90 7.86 Temperature (°C) °C 8.9 11.6 11.6 15.1 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ ACZ Lab Reference # L76236-01 L76236-05 Sample Date 6/4/2009 6/4/2009 Lab Test Date 6/5-6/17 6/5-6/12 Sampled B PH PH Alkalinity Total CaC03 m /I 41 Aluminum, dissolved m /l 0.16 0.16 0.16 0.06 B Anions me /I 0.8 Arsenic, dissolved m /I Arsenic, total m /I 0.002 0.002 0.002 -0.0005 U Bicarbonate m /I 22 140 64 41 Boron, dissolved m /I 0.04 B Cadmium, dissolved m /l -0.005 U Calcium, dissolved m /I 8.8 8.8 8.8 9.1 Carbonate m /l -2 U Cation - Anion Balance % 5.9 Cations me /I 0.9 Chloride m /l 49 7.3 1 B Conductivity umhos/cm 43 877 176 80 81 Copper, dissolved m /l -0.01 U Hardness m /I 19 98.5 48.7 31 Hydroxide m /I -2 U Iron, dissolved m /I 0.3 0.1 0.05 0.09 Iron, total m /I 0.17 27.2 3.9 1.93 1.79 Lead, dissolved m /I -0.04 U Lead, total m /I Magnesium, dissolved m /l 1.2 1.7 1.45 2.0 Manganese, dissolved m /I 0.014 0.024 0.018 0.032 Manganese, total m /1 0.004 0.45 0.078 0.056 Mercury, dissolved m /l Mercury, total m /I -0.0002 U Molybdenum, dissolved m /1 -0.01 U Nitrate as N), dissolved m /l Nitrate/Nitrite as N m /I 0.02 0.13 0.08 0.03 B Nitrite as N), dissolved m /I H lab SU 6.1 8.2 7.4 8.1 H 8.2 H Phosphate m /I ' 0.09 B Phosphorus Ortho , dissolved m /I 3.19 0.27 0.03 B Potassium, dissolved m /I 0.6 B Selenium, dissolved m /l Selenium, total m /1 0.0001 B Sodium Absorption Ratio SAR calc. 0.26 1.18 0.66 0.50 Sodium, dissolved m /I 6.5 6.5 6.5 6.4 Sulfate m g/11 36 11 -1 U TDS Ratio talc. 1.36 TDS Calc. m /l 44 B TDS m /l 30 454 1 60 60 TSS m /I 1.8 568 21 15 B Zinc, dissolved mg/l 0.01 U ' Baseline and WY 2000 data adapted from WWE (2001). Shaded cells indicate value different from AHR 2000 baseline value due to rounding. z ACZ Laboratory, Steamboat Springs, CO 1 Negative values denote readings below lab detection levels. 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. H - Holding time exceeded; pH is a field test with an immediate hold time. B -Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine C-10 2009 Annual Hydrology Report HydroGeo, Inc.