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Minnesota Creek Reservoir Flume <br />Surface Water Quality and Field Parameters <br />• <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: Minnesota Ck Reservoir Flume Baseline 2008 Water Year <br />Enviro- <br />Descri tion Units Minimum Maximum Mean6 5/5/2008 6/8/2008 Chem MDL 8/22/2008 <br />Field Parameters` <br />m or Staff <br />83 <br />3591 <br />1364 <br />0.86' <br />0.37' <br />0.36' <br />Flow <br />Electrical Conductivity mhos/cm 114 682 360 291 370 140 <br />H SU 8 9 8 7.92 8.36 7.90 <br />Temperature (°C) °C 15 24 18 11.3 14.8 19.3 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 Enviro-Chem <br />Lab Reference # 08/948 <br />6/8/2008 <br />Sample Date 6/9-7/30 <br />Lab Test Date <br />Sampled B P. Holder <br />2 <br />Alkalinity (Total CaC03) mg/I 46 230 140 142.1 <br />dissolved <br />Aluminum m g/1 -0.03 0.08 0.05 0.352 0.01 <br />, <br />Anions me /I 0.90 4.80 3.06 20.058 calc <br />Arsenic, dissolved m /I <br />m /I <br />001 <br />-0 <br />0.001 <br />0.001 <br />0.077 <br />0.001 <br />Arsenic, total . <br />Bicarbonate m /I 46 213 134 <br />01 <br />1 <br />01 <br />0 <br />dissolved <br />Boron m g/1 -0.01 0.02 0.01 . . <br />, <br />dissolved <br />Cadmium m /I 0.01 0.01 -0.01 0.006 0.001 <br />, <br />Calcium, dissolved m /I 8.9 53.7 31.2 40.2 0.1 <br />Carbonate m /l <br />% 2 <br />-5 <br />9 18 <br />2.1 8 <br />-1.1 <br />11.46 <br />calc <br />Cation - Anion Balance . 4 <br />7 0 <br />3 22.655 calc <br />Cations me /I <br />m /I 0.8 <br />1.00 . <br />3.00 . <br />1.86 1.44 0.1 <br />Chloride 005 <br />0 <br />Chromium m /I <br />mhos/cm 95 456 295 365.18 . <br />1 <br />Conductivity <br />Copper, dissolved m /I -0.01 -0.01 -0.01 0.04 0.002 <br />Cyanide, total m /I <br />/I <br />31 <br />192 <br />111 <br />148.9718 <br />calc <br />Hardness m <br />Hydroxide m g/1 <br />m /I -2 <br />03 <br />0 -2 <br />0.26 -2 <br />0.10 <br />0.28 <br />0.01 <br />Iron, dissolved /1 <br />m . <br />0 <br />36 3.62 1.58 3.02 0.01 <br />Iron, total <br />Lead, dissolved g <br />m /I . <br />-0.04 -0.04 -0.04 0 0.005 <br />Lead, total m /I <br />/1 <br />m <br />1 <br />2 <br />14.1 <br />8.1 <br />11.8 <br />0.1 <br />Magnesium, dissolved g <br />m /I . <br />01 <br />-0 0.09 0.03 0.002 0.005 <br />Manganese, dissolved m /I . <br />031 <br />0 0.397 0.136 0.135 0.005 <br />Manganese, total m /I . <br />0002 <br />-0 -0.0002 -0.0002 0.00007 0.000025 <br />Mercury, total <br />Molybdenum, dissolved m /I . <br />-0.01 -0.01 -0.01 0.0016 0.001 <br />Nickel, dissolved m g/1 <br />2 <br />0 <br />0.13 <br />dissolved <br />Nitrate as N) m /I . <br />, <br />Nitrate/Nitrite as N m /l -0.02 0.64 0.22 0.21 0.13 <br />dissolved <br />Nitrite as N m /I 0.01 0.01 <br />, <br />H Lab SU 8.0 8.5 8.3 8.09 0.1 <br />Phosphate m g/1 -0.03 0.40 0.12 0 0.01 <br />dissolved <br />Phosphorus Ortho m /I -0.01 0.13 0.04 <br />, <br />Potassium, dissolved m /I 0.6 2.0 1.3 2.74 0.1 <br />Selenium, dissolved m g/1 <br />/I <br />001 <br />-0 <br />001 <br />-0 <br />-0.001 <br />0.003 <br />0.001 <br />Selenium, total m . . <br />Silver, total <br />Sodium Absorption Ratio SAR m g/1 <br />calc. <br />0.38 <br />1.16 <br />0.72 <br />1.328 <br />calc <br />dissolved <br />Sodium m g/1 4.8 32.4 17.3 37.25 0.1 <br />, <br />Sulfate m /I -10 30 6 22.78 2 <br />5 <br />TDS Ratio calc. 0.99 1.74 1.24 4.96 calc <br />TDS Calc m /I 46 244 158 263.45 2 <br />. <br />TDS m /I 70 250 176 251 2 <br />TSS m /I -5 60 26 63 2 <br />Zinc, dissolved mg/I -0.01 0.02 0.01 0 0.005 <br />Baseline 2006. <br />Grand Junction, CO <br />2 Enviro-Chem Analytical <br />, <br />3 Zero values denote readings below lab detection levels (MDL). <br />5 Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Galt.)) / TDS)] ' 100 <br />6 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all <br />Ireadings are below lab detection limit <br />West Elk Mine <br />HydroGeo, Inc. <br />C-23 2008 Annual Hydrology Report