2008-06-27_REPORT - C1980007 (5)

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Lower Raven Gulch Surface Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location L., Raven Gulch Baseline 2007 Water Year Description Units Minimum Maximum Mean 4 4/26/2007 5/23/2007 Q 5 8/24/2007 Field Parameters* Flow m 18,248 8,909 744 Electrical Conductivity µmhos/cm 142 247 351 H SU 8.83 8.49 8.22 Temperature °C °C 9.6 6.6 17.0 Temperature °F OF 49.3 43.9 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L62831-07 Sample Date 5/23/2007 Lab Test Date 5/25-6/14 Sampled B Alkalinity (Total CaCO3) mg/I 58 76 67 98 Aluminum, dissolved m /I -0.03 0.05 0.01 0.05 B Anions me /I 1.6 1.7 1.7 2.4 Arsenic, dissolved m /I Arsenic, total M q/1 0.0009 0.0012 0.0011 0.0014 Bicarbonate m /I 58 76 67 96 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /l 15 20 18 26.4 Carbonate m /I -2 -2 -2 2 B Cation - Anion Balance m /l 0.0 2.9 1.5 0.0 Cations me /I 2 2 2 2.4 Chloride m /I -1 1 0 1 B Conductivity µmhos/cm 145 170 158 236 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 51 64 58 84 Hydroxide m /I., -2 -2 -2 -2 U Iron, dissolved m /I 0.05 0.10 0.08 0.06 Iron, total m /I 7.88 9.04 8.46 19.10 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 3.0 3.5 3.3 4.4 Manganese, dissolved m /I -0.005 0.006 0.001 0.007 B Manganese, total m /I 0.168 0.192 0.180 0.400 Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01, -0.01 -0.01 U Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.02 0.00 -0.02 U Nitrite as N), dissolved m /I H SU 7.8 8.3 8.1 8.3 H Phosphate m /I 0.09 0.18 0.14 0.27 Phosphorus Ortho , dissolved m /l 0.03 0.06 0.05 0.09 H Potassium, dissolved m /l 0.9 1.1 1.0 1.2 B Selenium, total m /l -0.001 -0.001 -0.001 -0.001 U Sodium Absorption Ratio SAR calc. 0.65 0.81 0.73 0.83 Sodium, dissolved m /l 11.8 13.2 12.5 17.4 Sulfate m /I 10 20 15 20 B TDS Ratio calc. 1.24 1.30 1.27 1.23 TDS Calc. m /I 89 92 91 130 TDS m /l 110 120 115 160 TSS m /1 186 296 241 680 H Zinc, dissolved mg/11 -0.01 -0.01 -0.01 0.02 B Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels 4 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit 5 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-19 2007 Annual Hydrology Report HydroGeo, Inc.