2010-06-30_REPORT - C1980007 (7)

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Spring 35-3 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location: Spring 35-3 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5 5/9/2009 6/4/2009 Q ° 8/9/2009 Field Parameters Flow m 0.63 26.5 6.3 33.0 7.02 1.48 Electrical Conductivity mhos/cm 223 560 427.5 229 340 445 H SU 6.53 8.74 7.5 7.70 7.70 7.94 Temperature OC 5.2 6.0 7.4 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L76236-07 Sample Date 6/4/2009 Lab Test Date 6/5-6/17 Sampled B PH Alkalinity (Total CaC03) mg/I 102 217 170 141 Aluminum, dissolved m /I -0.03 0.09 0.04 -0.03 U Aluminum, total m /l Anions me /I 2.5 4.8 3.9 3.3 Arsenic, dissolved m /I Arsenic, total m /I 0.0009 0.0130 0.0039 0.0007 B Bicarbonate m /I 102 212 169 141 Boron, dissolved m /I -0.01 -0.01 -0.01 0.01 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, total m /I Calcium, dissolved m /I 18.2 47.2 34.3 32.8 Carbonate m /I -2 4 2 -2 U Cation - Anion Balance % -8.6 -2.1 -4.4 1.5 Cations me /1 2.3 4.6 3.6 3.4 Chloride m /I 1 11 3 2 B Conductivity mhos/cm 216 451 351 306 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 59 142 105 101 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I -0.02 0.12 0.06 -0.02 U Iron, total m /I 0.19 42.50 9.14 0.12 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 3.3 5.8 4.8 4.6 Manganese, dissolved m /I -0.005 0.272 0.055 -0.005 B .Manganese, total m /I 0.021 1.280 0.325 0.202 .Mercury, total m /I -0.0002 0.0003 0.0001 -0.0002 U .Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Nitrate as N m /I Nitrate/Nitrite as N m /I -0.02 0.17 0.08 0.06 B Nitrite as N m /I H Lab SU 7.8 8.3 8.2 8.2 H Phosphate m /l -0.03 0.15 0.07 0.03 B Phosphorus Ortho , dissolved m /I -0.01 0.05 0.02 0.01 B Potassium, dissolved m /I 0.7 1.4 0.9 0.9 B Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 0.0001 B Sodium Absorption Ratio SAR talc. 1.27 1.60 1.45 1.38 Sodium, dissolved m /I 25.7 42.5 33.4 31.6 Sulfate m /I 10 30 20 23 TDS Ratio calc. 0.09 1.22 0.93 1.06 TDS Calc. m /I 131 248 199 180 TDS m /I 160 250 210 190 TSS m /I -5 510 133 -5 U Zinc, dissolved m /I -0.01 0.02 0.01 0.01 B Zinc, total mg/I ' Baseline 2006 2 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 cone detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). 5 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine E-29 2009 Annual Hydrology Report HydroGeo, Inc.