2009-07-01_REPORT - C1980007 (7)

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Poison Gulch Surface Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location: Poison Gulch Baseline ,s 2008 Water Year Description Units Minimum Maximum Mean 5/5/2008 6/8/2008 Enviro-Chem MDL 8/22/2008 Field Parameters" Flow m 530 56 Trickle Electrical Conductivity mhos/cm 236 325 407 H SU 7.32 7.77 7.23 Temperature (°C) °C 8.0 13.9 11.0 Comment Laboratory Parameters 3 Name of Certified Lab z Enviro-Chem Lab Reference # 08/935 Sample Date 6/8/2008 Lab Test Date 6/9-7/30 Sampled B P. Holder Alkalinity (Total CaCO3) mg/I 119 152 136 146.33 2 Aluminum, dissolved m /I -0.03 -0.03 -0.03 0.194 0.01 Anions me /I 2.4 3.0 2.7 3.915 calc Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.0007 0.0005 0.0052 0.001 Bicarbonate m /I 119, 152 136 Boron, dissolved m g/1 0.02 0.03 0.03 0.83 0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.004 0.001 Calcium, dissolved m /I 22.0 35.5 28.8 36 0.1 Carbonate m /I -2 -2 -2 Cation - Anion Balance % -2.1 7.7 4.4 5.11 calc Cations me /I 2.3 3.5 2.9 4.126 calc Chloride m /I 1 1 1 1.44 0.1 Chromium m /I 0.005 Conductivity mhos/cm 240 295 268 317.9 1 Copper, dissolved nn/1 -0.01 -0.01 -0.01 0.032 0.002 Cyanide, total m /I Hardness m /I 78 124 101 133.9546 calc Hydroxide m /I -2 -2 -2 Iron, dissolved m /I 0.07 0.11 0.09 0.12 0.01 Iron, total m /I 0.41 0.43 0.42 2.58 0.01 Lead, dissolved m /I -0.04 -0.04 -0.04 0 0.005 Lead, total m /I Ma nesium, dissolved m /I 5.6 8.6 7.1 10.7 0.1 Manganese, dissolved m /I -0.005 -0.005 -0.005 0.003 0.005 Manganese, total m /I -0.005 0.010 0.006 0.02 0.005 Mercury, total m /I -0.0002 -0.0002 -0.0002 0.00004 0.000025 Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0.0017 0.001 Nickel, dissolved m /I Nitrate as N), dissolved m /I 0 0.13 Nitrate/Nitrite as N) m /I 0 0.13 Nitrite as N), dissolved m /I 0.01 0.01 H SU 7.8 8.1 8.0 8.02 0.1 Phosphate m /I 0.21 0.21 0.21 0.14 0.01 Phosphorus Ortho , dissolved m /I 0.07 0.07 0.07 Potassium, dissolved m /I 2.9 2.9 2.9 3.64 0.1 Selenium, dissolved m /I Selenium, total m /I -0.001 -0.001 -0.001 0.005 0.001 Silver, total m /I Sodium Absorption Ratio SAR calc. 0.82 0.92 0.87 1.052 calc Sodium, dissolved m /I 16.6 23.3 20.0 28 0.1 Sulfate m /I -10 -10 -10 8.64 2 TDS Ratio calc. 1.04 1.08 1.06 7.52 caIC5 TDS Calc.) m /I 120 163 142 238.68 2 TDS m /I 130 170 150 222 2 TSS m /I -5 28 15 40 2 Zinc, dissolved mg/I -0.01 -0.01 -0.01 1 1 0 0.005 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 e Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit West Elk Mine C-21 2008 Annual Hydrology Report HydroGeo, Inc.