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Deer Creek <br />e..sf ter n"nlihi nnrl Pialrl PnramPtP_rA <br />0 <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: Deer Creek Baseline 2008 Water Year <br /> <br />Descri tion <br />Units <br />Minimum <br />Maximum <br />Mean 6 <br />5/5/2008 <br />6/8/2008 Enviro- <br />Chem MDL <br />8/22/2008 <br />Field Parameters" <br />Flow m 0.72 114 44.7 550 92 D <br />Electrical Conductivity 537 796 659 445 529 <br />H SU 8.3 8.4 8.4 8.03 8.59 <br />Temperature (°C) °C 11.2 16.9 13.1 16.9 22.5 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 Enviro-Chem <br />Lab Reference # 08/938 <br />Sample Date 6/8/2008 <br />Lab Test Date 6/9-7/30 <br />Sampled B P. Holder <br />Alkalinity (Total CaCO3) mg/I 247 274 263 236.37 2 <br />Aluminum, dissolved <br />Anions m /I <br />me /I -0.03 <br />5.6 -0.03 <br />6.2 -0.03 <br />5.9 0.641 <br />6.555 0.01 <br />talc <br />Arsenic, dissolved <br />Arsenic, total m /I <br />m /I -0.0005 <br />-0.0005 -0.0005 <br />0.0009 -0.0005 <br />0.0006 <br />0 <br />0.001 <br />Bicarbonate m /l 218 249 235 <br />Boron, dissolved <br />Cadmium, dissolved <br />Calcium, dissolved M q/1 <br />m /I <br />m /I 0.03 <br />-0.005 <br />47.0 0.03 <br />-0.005 <br />64.5 0.03 <br />-0.005 <br />56.5 0.63 <br />0 <br />59.7 0.01 <br />0.001 <br />0.1 <br />Carbonate m /l 25 30 28 <br />Cation - Anion Balance % -5.7 4.6 3.7 0.61 tale <br />Cations nre /1 5.0 6.8 5.9 6.595 talc <br />Chloride M q/1 3 3 3 1.44 0.1 <br />Chromium m /I 0.005 <br />Conductivity mhos/Cm 487 547 517 410.82 1 <br />Copper, dissolved m /I -0.01 -0.01 -0.01 0.017 0.002 <br />Cyanide, total <br />Hardness m /l <br />m /I <br />176 <br />245 <br />211 <br />237.1961 <br />talc <br />Hydroxide m /l -2 -2 -2 <br />Iron, dissolved m q/1 0.09 0.11 0.10 0.1 0.01 <br />Iron, total m /I 0.36 2.92 1.64 1.71 0.01 <br />Lead, dissolved m /I -0.04 -0.04 -0.04 0 0.005 <br />Lead, total m /I <br />Magnesium, dissolved m /I 14.3 20.4 18.3 21.4 0.1 <br />Manganese, dissolved m /I -0.005 0.009 0.005 0.006 0.005 <br />Manganese, total m /l -0.005 0.049 0.026 0.06 0.005 <br />Mercury, total m /I -0.0002 -0.0002 -0.0002 0.00002 0.000025 <br />Molybdenum, dissolved m /I -0.01 -0.01 -0.01 0.0031 0.001 <br />Nickel, dissolved rn /l <br />Nitrate as N), dissolved m /I 2.19 0.13 <br />Nitrate/Nitrite as N m /I 0.88 2.07 1.50 2.2 0.13 <br />Nitrite as N), dissolved m /I 0.01 0.01 <br />Nitrogen, ammonia m /1 <br />H SU 8.5 8.6 8.6 8.41 0.1 <br />Phosphate m /I 0.03 0.12 0.08 0.02 0.01 <br />Phosphorus OrthO , dissolved m /I 0.01 0.04 0.03 <br />Potassium, dissolved m /I 12 3.6 3.4 5.09 0.1 <br />Selenium, dissolved m /l <br />Selenium, total m /I -0.001 -0.001 -0.001 0.003 0.001 <br />Silver, total m /l <br />Sodium Absorption Ratio SAR talc. 1.09 1.21 1.15 1.059 talc <br />Sodium, dissolved <br />Sulfate <br />TDS Ratio m /l <br />m /I <br />talc. 32.8 <br />30 <br />0.92 43.9 <br />50 <br />0.96 39.9 <br />40 <br />0.94 37.5 <br />30.46 <br />5.37 0.1 <br />2 <br />talcs <br />TDS Calc. m /l 292 346 319 397.55 2 <br />TDS m /I 280 330 310 376 2 <br />TSS m /I 16 68 42 150 2 <br />Zinc, dissolved mg/I -0.01 0.02 0.01 0 0.005 <br />' Baseline 2005 <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />3Zero 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 talc using 1/2 of detection limit for readings below lab detection limits unless <br />all readings are below lab detection limit <br />West Elk Mine <br />C-20 2008 Annual Hydrology Report HydroGeo, Inc.