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Deer Creek <br />?..s., •.., %At f- n...llh...A Fialrl Paramatam <br />• <br /> <br />C-20 <br />Mountain Coal West Elk Mine <br />Monitoring Location: Deer Creek Baseline 2007 Water Year <br />Description Units Minimum Maximum Mean 4/27/2007 5/30/2007 Q 8/23/2007 <br />Field Parameters* <br />Flow m 0.72 114 44.7 22.20 46.98 D <br />Electrical Conductivity µmhos/cm 537 796 659 546 579 <br />H SU 8.3 8.4 8.4 8.64 8.42 <br />Temperature °C) °C 11.2 16.9 13.1 16.9 15.1 <br />Temperature (°F OF 52.1 62.5 55.7 62.4 59.2 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Labs ACZ <br />Lab Reference # L62931-09 <br />Sample Date 5/30/2007 <br />Lab Test Date 5/31-6/21 <br />Sampled B <br />Alkalinity (Total CaC03) mg/I 247 274 263 241 <br />Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U <br />Anions me /I 5.6 6.2 5.9 5.7 <br />Arsenic, dissolved m /I -0.0005 -0.0005 -0.0005 <br />Arsenic, total m /I -0.0005 0.0009 0.0006 0.0006 B <br />Bicarbonate m /I 218 249 235 221 <br />Boron, dissolved m /I 0.03 0.03 0.03 0.04 B <br />Cadmium, dissolved M q/1 -0.005 -0.005 -0.005 -0.005 U <br />Calcium, dissolved <br />Carbonate m /I <br />m /I 47.0 <br />25 64.5 <br />30 56.5 <br />28 56.8 <br />20 <br />B <br />Cation - Anion Balance % -5.7 4.6 3.7 5.8 <br />Cations me /I 5.0 6.8 5.9 6.4 <br />Chloride m /I 3 3 3 3 B <br />Chromium m /I <br />Conductivity <br />Copper, dissolved µmhos/cm <br />m /I 487 <br />-0.01 547 <br />-0.01 517 <br />-0.01 535 <br />-0.01 <br />U <br />Cyanide, total m /I <br />Hardness m /I 176 245 211 225 <br />Hydroxide m /I -2 -2 -2 -2 U <br />Iron, dissolved m /I 0.09 0.11 0.10 0.06 <br />Iron, total <br />Lead, dissolved m /I <br />m /I 0.36 <br />-0.04 2.92 <br />-0.04 1.64 <br />-0.04 2.76 <br />-0.04 <br />U <br />Lead, total m /I <br />Magnesium, dissolved <br />Manganese, dissolved m /I <br />m /I 14.3 <br />-0.005 20.4 <br />0.009 18.3 <br />0.005 20.3 <br />-0.005 <br />U <br />Manganese, total <br />Mercury, total <br />Molybdenum, dissolved m /I <br />m /I <br />m /I -0.005 <br />-0.0002 <br />-0.01 0.049 <br />-0.0002 <br />-0.01 0.026 <br />-0.0002 <br />-0.01 0.051 <br />-0.0002 <br />-0.01 <br />U <br />U <br />Nickel, dissolved m /I <br />Nitrate as N , dissolved m /I <br />Nitrate/Nitrite as N m /I 0.88 2.07 1.50 0.84 <br />Nitrite as N), dissolved m /I <br />- <br />- <br />- <br />Nitrogen, ammonia <br />H <br />Phosphate <br />Phosphorus Ortho , dissolved m /I <br />SU <br />m /I <br />m /I <br />8.5 <br />0.03 <br />0.01 <br />8.6 <br />0.12 <br />0.04 <br />8.6 <br />0.08 <br />0.03 <br />8.6 <br />0.09 <br />0.03 <br />H <br />B <br />B <br />Potassium, dissolved m /I 3.2 3.6 3.4 3.0 <br />Selenium, dissolved <br />Selenium, total. m /I <br />m /I <br />-0.001 <br />-0.001 <br />-0.001 <br />-0.001 <br />U <br />Silver, total m /I <br />Sodium Absorption Ratio SAR <br />Sodium, dissolved <br />Sulfate calc. <br />m /I <br />m /I 1.09 <br />32.8 <br />30 1.21 <br />43.9 <br />50 1.15 <br />39.9 <br />40 1.26 <br />43.0 <br />40 <br /> <br />B <br />TDS Ratio calc. 0.92 0.96 0.94 1.00 <br />TDS Calc. m /I 292 346 319 319 <br />TDS m /I 280 330 310 320 <br />TSS <br />Zinc, dissolved m /I <br />mg/I 16 <br />-0.01 68 <br />0.02 42 <br />0.01 88 <br />-0.01 <br />U <br />' Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels <br />4 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 />5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit <br />West Elk Mine <br />HydroGeo, Inc. <br />2007 Annual Hydrology Report