2010-06-30_REPORT - C1980007 (6)

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Minnesota Creek Reservoir Flume Surface Water Quality and Field Parameters in Coal West Elk Mine ing Location: Minnesota Ck Reservoir Flume Baseline 2009 Water Year ion F Units Minimum Maximum Means 5/8/2009 6/3/2009 Q a 8/11/2009 rameters* m or Staff 83 3591 1364 0.75' 0.61' 0.21' Electrical Conductivity µmhos/cm 114 682 360 202 196 176 H S U 8 9 8 8.53 8.33 8.36 Temperature CC) °C 15 24 18 15.4 15.3 13.2 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-03 Sample Date 6/3/2009 Lab Test Date 6/4-6/16 Sampled B PH Alkaliniry o a a s mg 46 230 140 85 Aluminum, dissolved m /I -0.03 0.08 0.05 -0.03 U Anions me /I 0.90 4.80 3.06 2.0 Arsenic, total m /I -0.001 0.001 0.001 0.0009 B Bicarbonate m /I 46 213 134 83 Boron, dissolved m /I -0.01 0.02 0.01 0.01 B Cadmium, dissolved m /I -0.01 -0.01 -0.01 -0.005 U Calcium, dissolved m /I 8.9 53.7 31.2 18.7 Carbonate m /l -2 18 8 2 B Cation - Anion Balance % -5.9 2.1 -1.1 -2.6 Cations meq/1 0.8 4.7 3.0 1.9 Chloride m /I 1.00 3.00 1.86 1 B Conductivity µmhos/cm 95 456 295 187 o per, dissolved m /I -0.01 -0.01 -0.01 -0.01 U ardness m /l 31 192 111 65 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /l 0.03 0.26 0.10 0.02 B Iron, total m /I 0.36 3.62 1.58 3.72 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 2.1 14.1 8.1 4.5 Manganese, dissolved m /I -0.01 0.09 0.03 0.027 B Manganese, total m /I 0.031 0.397 0.136 0.128 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 Nitrate/Nitrite (as N m /I -0.02 0.64 0.22 0.11 pH (Lab) SU 8.0 8.5 8.3 8.4 H Phosphate m /I -0.03 0.40 0.12 0.15 Phosphorus (Ortho), dissolved m /I -0.01 0.13 0.04 0.05 Potassium, dissolved m /I 0.6 2.0 1.3 1.0 13 Selenium, total m /I -0.001 -0.001 -0.001 0.0002 131 Sodium Absorption Ratio SAR calc. 0.38 1.16 0.72 0.71 Sodium, dissolved m /I 4.8 32.4 17.3 13.2 Sulfate m /I -10 30 6 14 TDS Ratio calc. 0.99 1.74 1.24 1.15 TDS (Calc.) m /I 46 244 158 104 TDS m /I 70 250 176 120 TSS m /I -5 60 26 60 Zinc, dissolved mg/I -0.01 0.02 0.01 -0.01 U 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. - 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). 5 Average mean value calc using 1/2 of detection limit for readin s below lab detection limits unless all readings are below lab detection limit. West Elk Mine C-23 2009 Annual Hydrology Report HydroGeo, Inc.