2010-06-30_REPORT - C1980007 (7)

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Deer Creek Spring Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location: Deer Creek Spring Baseline' 2009 Water Year Description Units Minimum Maximum Means 51812009 6/312009 Q ° 6/3/2009 (Duplicate) Q 4 8/11/2009 Field Parameters Flow m 0.94 4.15 2.88 6.6 5.7 5.7 0.28 Electrical Conductivity hos/cm 574 889 735 630 640 640 664 H SU 6.72 7.77 7.10 7.47 7.44 7.44 7.47 Temperature °C 7.1 17.4 10.9 6.8 7.5 7.5 10.1 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ ACZ Lab Reference # L76196-01 L76196-06 Sample Date 6/3/2009 6/3/2009 Lab Test Date 614-6/16 6/4-6/16 Sampled B PH PH Alkalinity (Total CaCO3) mg/I 294 302 298 290 283 Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U -0.03 Aluminum, total m /I Anions me /l 6.6 6.9 6.7 6.6 6.5 Arsenic, dissolved m /I Arsenic, total m /l -0.005 -0.005 -0.005 -0.0005 U -0.0005 Bicarbonate m /I 294 302 298 286 272 Boron, dissolved m /I -0.01 -0.01 -0.01 0.03 B 0.03 Cadmium, dissolved m /l -0.005 -0.005 -0.005 -0.005 U -0.005 J Calcium, total m /I Calcium, dissolved m /l 64.8 68.6 66.8 69.1 68.1 Carbonate m /I -2 -2 -2 4 B 11 B Cation-Anion Balance % -5.3 0.0 -2.1 0 -0.8 Cations me /1 6.2 6.6 6.425 6.6 6.4 Chloride m /I 3 4 3 3 B 3 Conductivity mhos/cm 587 660 611 585 598 Copper, dissolved m /l -0.01 -0.01 -0.01 -0.01 U -0.01 U Hardness m /I 241 255 249 256 252 Hydroxide m /I -2 -2 -2 -2 U -2 U Iron, dissolved m /I -0.02 -0.02 -0.02 -0.02 U -0.02 U Iron, total m /I -0.02 0.20 0.10 0.29 0.31 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U -0.04 U Magnesium, dissolved m /I 19.1 20.4 20.0 20.3 19.9 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U -0.005 U Manganese, total m /I -0.005 0.005 0.003 0.005 B 0.005 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U -0.01 U Nitrate as N m /l Nitrate/Nitrite as N m /I 1.92 2.33 2.16 1.65 1.65 Nitrite as N m /l pH SU 7.9 8.2 8.1 8.3 H 8.4 H Phosphate m /I -0.03 0.03 0.02 -0.03 U -0.03 U Phosphorus Ortho , dissolved m /l -0.01 0.01 0.02 -0.01 U -0.01 U Potassium, dissolved m /I 1.9 2.1 2.0 2.1 1.9 8 Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 0.0011 0.0010 Sodium Absorption Ratio SAR calc. 0.87 0.95 0.92 0.89 0.87 Sodium, dissolved m /I 31.1 34.7 33.0 32.4 31.7 Sulfate m 11 30 40 33 34 37 TDS Ratio calc. 0.95 1.06 1.02 1.01 0.98 TDS Calc. m /1 329 341 336 337 336 TDS m /1 320 360 343 340 330 TSS m /l -5 14 5 27 12 B Zinc, dissolved m /I 0.02 0.02 0.02 0.01 B 0.02 B Zinc, total mg/l Baseline 2006 Z ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 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 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab West Elk Mine E-30 2009 Annual Hydrology Report HydroGeo, Inc.