2008-06-27_REPORT - C1980007 (5)

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Minnesota Creek Reservoir Flume Surface Water Quality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location: Minnesota Ck Reservoir Flume Baseline t Water Year 20 Description Units Minimum Maximum Mean" 4/27/2007 /3 5/30/2007 Q s 8/24/2007 Field Parameters* Flow m 83 3591 1364 0.34 0.46' staff 0.05 Electrical Conductivity µmhos/cm 114 682 360 359 240 535 H SU 8 9 8 8.57 8.13 8.08 Temperature °C °C 15 24 18 15.1 18.0 Temperature °F OF 59 75 65 59.2 64.4 Comment Laboratory Parameters 3 N Name of Certified Lab 2 Lab Reference # Sample Date 5/30/2007 Lab Test Date Sampled B Alkalinity (Total CaC03) mg/I 46 230 140 91 Aluminum, dissolved m /1 -0.03 0.08 0.05 -0.03 U Anions me /l 0.90 4.80 3.06 2.0 Arsenic, dissolved m /I Arsenic, total T M/1 -0.001 0.001 0.001 0.0007 B Bicarbonate m /I 46 213 134 91 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 /l 8.9 53.7 31.2 21.9 Carbonate m /l -2 18 8 -2 U Cation - Anion Balance % -5.9 2.1 -1.1 7.0 Cations me /I 0.8 4.7 3.0 2.3 Chloride m /I 1.00 3.00 1.86 2 B Chromium m /I Conductivity µmhos/cm 95 456 295 211 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /I Hardness m /l 31 192 111 78 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.03 0.26 0.10 0.11 total Iron m /I 0.36 3.62 1.58 , Lead, dissolved m /I -0.04 o.oa -0.04 Lead, total m /I dissolved Magnesium m /I 2.1 14.1 8.1 W , Man anese, dissolved m /l -0.01 0.09 0.03 Manganese, total m /I 0.031 0.397 0.136 total Mercu m /I -0.0002 -0.0002 -0.0002 , Mol bdenum, dissolved m /l -0.01 -0.01 -0.01 Nickel, dissolved m /I Nitrate as N), dissolved m /l Nitrate/Nitrite as N m /l -0.02 0.64 0.22 0.11 dissolved Nitrite as N) m /I , H Lab SU 8.0 8.5 8.3 - 8.3 - H - Phosphate m /I -0.03 0.40 0.12 0.09 B Phosphorus Ortho , dissolved m /I -0.01 0.13 0.04 0.03 B Potassium, dissolved m /I 0.6 2.0 1.3 1.1 B dissolved Selenium m /I , Selenium, total m /l -0.001 -0.001 -0.001 0.001 U total Silver m /I , Sodium Absorption Ratio SAR calc. 0.38 1.16 0.72 0.60 dissolved Sodium m /l 4.8 32.4 17.3 16.2 , Sulfate m /I -10 30 6 10 B TDS Ratio calc. 0.99 1.74 1.24 1.16 TDS Calc. m /I 46 244 158 112 TDS m /I 70 250 176 130 TSS m /I 5 60 26 38 Zinc, dissolved mg/I 0.01 0.02 0.01 0.02 B Baseline 2006. 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels a Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit e 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). C-23 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.