2010-06-30_REPORT - C1980007 (6)

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Deer Creek Surface Water Quality and Field Parameters • • C-20 Mountain Coal West Elk Mine Monitoring Location: Deer Creek Baseline' 2009 Water Year Description Units Minimum Maximum Mean a 5/8/2009 6/3/2009 Q ° 8/10/2009 Field Parameters* Flow m 0.72 114 44.7 Dry 25.98 D Electrical Conductivity iimhos/cm 537 796 659 568 H SU 8.3 8.4 8.4 8.51 Temperature (°C) °C 11.2 16.9 13.1 18.4 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-07 Sample Date 6/3/2009 Lab Test Date 6/4-6/16 Sampled By j PH Alkalinity (Total CaC03) mg/I 247 274 263 281 Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U Anions me /I 5.6 6.2 5.9 6.4 Arsenic, dissolved m /l -0.0005 -0.0005 -0.0005 Arsenic, total 1 -0.0005 0.0009 0.0006 0.0024 Bicarbonate 1 218 249 235 258 Boron, dissolved 0.03 0.03 0.03 0.03 B Cadmium, dissolved I 1 -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved 47.0 64.5 56.5 59.0 Carbonate M/1 25 30 28 22 Cation - Anion Balance % -5.7 4.6 3.7 -2.4 Cations me /l 5.0 6.8 5.9 6.1 Chloride m /I 3 3 3 3 B Chromium m /I Conductive µmhos/cm 487 547 517 566 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /I Hardness m /I 176 245 211 221 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.09 0.11 0.10 0.03 B Iron, total m /I 0.36 2.92 1.64 12.5 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Lead, total m /I Magnesium, dissolved m /I 14.3 20.4 18.3 17.9 Manganese, dissolved m /I -0.005 0.009 0.005 -0.005 U Manganese, total m /I -0.005 0.049 0.026 0.192 Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Nickel, dissolved m /I Nitrate as N), dissolved m /l Nitrate/Nitrite as N m /I 0.88 2.07 1.50 0.93 Nitrite as N), dissolved m /I Nitrogen, ammonia m /I H SU 8.5 8.6 8.6 8.7 H Phosphate m /I 0.03 0.12 0.08 0.31 Phosphorus Ortho , dissolved m /I 0.01 0.04 0.03 0.10 Potassium, dissolved m /I 3.2 3.6 3.4 3.0 Selenium, dissolved m /I Selenium, total m /I -0.001 -0.001 -0.001 0.0012 Silver, total m /I Sodium Absorption Ratio SAR ca1c. 1.09 1.21 1.15 1.13 Sodium, dissolved m /I 32.8 43.9 39.9 38.2 Sulfate m /I 30 50 40 36 TDS Ratio talc. 0.92 0.96 0.94 1.02 TDS Calc. m /I 292 346 319 334 TDS m /1 280 330 310 340 TSS m /I 16 68 42 506 Zinc, dissolved mg/I -0.01 0.02 0.01 -0.01 U ' Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). s Avera a mean value calc usin 1/2 of detection limit for readin s below lab detection limes unless all rea in s are below lab detection limit. West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.