2008-06-27_REPORT - C1980007 (5)

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Deep Creek Ditch Surface Water Quality and Field Parameters • • C-22 Mountain Coal West Elk Mine Monitoring Location: Deep Creek Ditch Baseline' 2007 Water Year Description Units Minimum Maximum Mean ° 4/28/2007 5/29/2007 Q s 8/27/2007 Field Parameters* Flow m / staff 69.77 1527.27 562.69 .10' Staff .20' Staff .01' Staff Electrical Conductivity µmhos/cm 75.9 928 316 101.7 90 82 H SU 6.32 8.20 7.27 8.11 8.13 8.10 Temperature °C °C 5.0 11.9 9.6 10.3 9.9 11.3 Temperature °F OF 41.0 53.4 49.3 50.5 49.8 52.3 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L62928-08 Sample Date 5/29/2007 Lab Test Date 5/31-6/18 Sampled B Alkalinity (Total CaC03) mg/I 25 60 45 33 Aluminum, dissolved m /I 0.05 0.15 0.10 -0.03 U Anions me /1 0.5 1.4 0.9 0.6 Arsenic, dissolved m /l Arsenic, total m /l -0.0005 0.0006 0.0003 -0.0005 U Bicarbonate m /I 25 60 45 33 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cadmium, dissolved m /l -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /l 4.6 13.7 10.1 9 Carbonate m/1 -2 -2 -2 -2 U Cation - Anion Balance % -11.1 6.7 -3.0 14.3 Cations me /I 0.4 1.2 0.9 0.8 Chloride m /I 1 9 3 1 B Chromium m /I Conductivity µmhos/cm 50 113 88 71 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /l Hardness m /I 16 47 35 31 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.04 0.14 0.09 0.05 B Iron, total m /I 1.19 2.59 1.83 1.02 Lead, dissolved m q/1 -0.04 -0.04 -0.04 -0.04 U Lead, total m /l Magnesium, dissolved m /I 1.1 3.1 2.3 2.1 Manganese, dissolved m /I -0.005 0.013 0.005 -0.005 U Manganese, total m /l 0.032 0.090 0.064 0.04 Mercury, total m /l -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 /l Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 3.39 0.90 0.04 B Nitrite as N), dissolved m /l H Lab SU 7.8 8.1 8.0 8.0 H Phosphate MO 0.06 0.09 0.08 0.06 B Phosphorus OrthO , dissolved m /I 0.02 0.03 0.03 0.02 H, B Potassium, dissolved m /I -0.3 0.7 0.5 0.7 B Selenium, dissolved m /I Selenium, total m /I -0.001 -0.001 -0.001 -0.001 U Silver, total m /l Sodium Absorption Ratio SAR calc. 0.19 0.33 0.28 0.30 Sodium, dissolved m /I 1.8 5.2 3.9 3.9 Sulfate m /l -10 -10 -10 -10 U TDS Ratio calc. 1.38 2.05 1.64 1.35 TDS Calc. m /I 24 68 47 37 B TDS m /I 40 100 75 50 TSS m /I 8 76 32 26 Zinc, dissolved mg/I -0.01 0.03 0.02 0.03 B Baseline 2006. 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit s 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 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.