2009-07-01_REPORT - C1980007 (7)

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Lower Raven Gulch Surface Water Quality and Field Parameters 0 0 Mountain Coal West Elk Mine Monitoring Location L. Raven Gulch Baseline' 2008 Water Year Descri tion Units Minimum Maximum Mean 6 5/6/2008 6/2/2008 Enviro- Chem MDL 8/24/2008 Field Parameters* Flow m 89,000 28,000 370 Electrical Conductivity µmhos/cm 200 192 382 1..1 SU 7.66 8.35 8.63 Temperature (°C) °C 67 13.3 19.0 Comment Laboratory Parameters 3 Name of Certified Lab 2 Enviro-Chem Lab Reference # 08/829 Sample Date 6/2/2008 Lab Test Date 6/3-6/26 Sampled B P. Holder Alkalinity (Total CaC03) mg/l 58 76 67 62.43 2 Aluminum, dissolved m /l -0.03 0.05 0.01 0.13 0.01 Anions me /l 1.6 1.7 1.7 2.598 calc Arsenic, dissolved m /l Arsenic, total m /I 0.0009 0.0012 0.0011 0.003 0.001 Bicarbonate m /I 58 76 67 Boron, dissolved m /I -0.01 -0.01 -0.01 0.015 0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.002 0.001 Calcium, dissolved m /l 15 20 18 22.9 0.1 Carbonate m /l -2 -2 -2 Cation - Anion Balance m /I 0.0 2.9 1.5 -9.71 calc Cations me /l 2 2 2 2.368 talc Chloride m /l -1 1 0 2.51 0.1 Conductivity µmhos/cm 145 170 158 177.75 1 Copper, dissolved m /l -0.01 -0.01 -0.01 0.009 0.002 Hardness m /1 51 64 58 84.89544 calc Hydroxide m /I -2 -2 -2 Iron, dissolved m /I 0.05 0.10 0.08 0.164 0.01 Iron, total m /I 7.88 9.04 8.46 1.87 0.01 Lead, dissolved m /l -0.04 -0.04 -0.04 0 0.005 Magnesium, dissolved m /l 3.0 3.5 3.3 6.73 0.1 Manganese, dissolved m /I -0.005 0.006 0.001 0 0.005 Manganese, total m /l 0.168 0.192 0.180 0.098 0.005 Mercury, total m /I -0.0002 -0.0002 -0.0002 0.00011 0.000025 Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0 0.01 Nitrate as N), dissolved m /I 0 3 01 Nitrate/Nitrite as N m /I -0.02 0.02 0.00 0 0.13 Nitrite as N), dissolved m /I 0.02 0.01 H SU 7.8 8.3 8.1 7.84 0.1 Phosphate m /I 0.09 0.18 0.14 0.04 0.01 Phosphorus Ortho , dissolved m /l 0.03 0.06 0.05 0.0359 0.01 Potassium, dissolved m /I 0.9 1.1 1.0 1.27 0.1 Selenium, total m /l -0.001 -0.001 -0.001 0 0.001 Sodium Absorption Ratio SAR talc. 0.65 0.81 0.73 0.71 calc Sodium, dissolved m /l 11.8 13.2 12.5 14.7 0.1 Sulfate m /I 10 20 15 21.4 2 TDS Ratio calc. 1.24 1.30 1.27 1.06 calc TDS Calc. m /l 89 92 91 134.32 2 TDS m /l 110 120 115 143 2 TSS m /1 186 296 241 l 131 2 Zinc, dissolved mg/l -0.01 -0.01 ni 1 0.014 0.005 1 Baseline 2005 2 Enviro-Chem Analytical, Grand Junction, CO 3Zero values denote readings below lab detection levels (MDL). 5 Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)] * 100 6 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit West Elk Mine C-19 2008 Annual Hydrology Report HydroGeo, Inc.