2010-06-30_REPORT - C1980007 (6)

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Middle Dry Fork Flume Surface Water Quality and Field Parameters • C C-9 Mountain Coal West Elk Mine Monitoring Location: Middle Dry Fork Flume Baseline 2009 Water Year Description Units Minimum Maximum Mean 5/9/2009 6/3/2009 Q 4 8/11/2009 Field Parameters Flow Staff Gauge or cfs 0.97' 0.60' 0.32' Electrical Conductivity umhos/cm 30 480 213 137.5 161.8 124 H SU 7.80 8.50 8.20 8.06 8.19 8.00 Temperature (°C) °C 3.6 19.8 12 11.6 14.4 17.9 Comment .Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-05 Sample Date 6/3/2009 Lab Test Date 6/4-6/16 Sampled B PH Alkalinity Total CaC03 m /I 34 270 142 64 Aluminum, dissolved m /I 0.07 0.07 0.07 -0.03 U Anions me /I 1.1 1.1 1.1 1.5 Arsenic, dissolved m /I Arsenic, total m /I 0.002 0.002 0.002 0.0009 B Bicarbonate m /I 34 270 142 64 Boron, dissolved m /I 0.01 B Cadmium, dissolved m /I -0.005 U Calcium, dissolved m /I 6.6 56.6 31.96 13.8 Carbonate m /I -2 U Cation - Anion Balance % -22.2 -22.2 -22.2 -3.4 Cations me /I 0.7 0.7 0.7 1.4 Chloride m /I 4 1 1 B Conductivity umhos/cm 76 76 76 144 Copper, dissolved m /I -0.01 U Hardness m /I 23 208 115 47 Hydroxide m /I -2 U Iron, dissolved m /I 0.11 0.11 0.11 0.03 B Iron, total m /I 0.16 14.2 3.14 3.63 Lead, dissolved m /I -0.04 U Lead, total m /I Magnesium, dissolved m /I 1.5 17.6 8.7 3.0 Manganese, dissolved m /I 0.029 0.029 0.029 0.042 Manganese, total m /I 0.01 0.432 0.11 0.132 Mercury, total m /I -0.0002 U Molybdenum, dissolved m /I -0.01 U Nitrate as N), dissolved m /I 0.57 0.10 Nitrate/Nitrite as N m /I 0.57 0.12 0.04 B Nitrite as N), dissolved m /I 0.1 0.02 H lab SU 6.7 6.7 6.7 8.3 H Phosphate m /I 0.33 0.33 0.33 0.15 Phosphorus Ortho , dissolved m /I 0.166 0.041 0.05 B Potassium, dissolved m /I 0.5 0.5 0.5 0.8 B Selenium, dissolved m /I Selenium, total m /I -0.0001 U Sodium Absorption Ratio SAR calc. 0.47 1.19 0.78 0.67 Sodium, dissolved m /I 5.9 38.8 19.9 10.5 Sulfate m /I 50 25 9 TDS Ratio cafc. 1.30 TDS Calc. m /I 77 TDS m /I 50 300 172 100 TSS m /l 278 72 69 Zinc, dissolved mg/I -0.01 U Baseline and WY 2000 data adapted from WWE (2001). 2 ACZ Laboratory, Steamboat Springs, CO 3 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 2009 Annual Hydrology Report HydroGeo, Inc.