2008-06-27_REPORT - C1980007 (6)

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Spring J-2 Water Quality and Field Parameters i i Mountain Coal West Elk Mine Monitoring Location: Spring J-2 Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4 4/29/2007 5/30/2007 Q5 8/24/2007 Field Parameters Flow m 0.11 0.26 0.18 0.31 0.23 0.16 Electrical Conductivity µmhos/cm 975 1690 1281 1254 1252 1103 H SU 8.26 9.1 8.59 8.30 8.37 8.19 Temperature OF 49.2 67.2 57.90 40.1 39.2 54.1 Temperature C 9.6 19.6 14.40 4.5 4.0 12.3 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L62931-02 Sample Date 5/30/2007 Lab Test Date 5/31-6/21 Sampled l3 Alkalinity (Total CaCQ) mg/I 605 650 637 573 Aluminum, dissolved m /I -0.03 0.20 0.12 0.04 6 Aluminum, total m /I Anions me /I 12.7 14.6 13.5 12.2 Arsenic, dissolved m /I Arsenic, total m /I -0.005 0.010 0.003 0.0011 Bicarbonate m /I 557 614 584 522 Boron, dissolved m /I 0.45 0.59 0.54 0.51 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, total m /I Calcium, dissolved m /I 4.2 10.9 5.8 4.5 Carbonate m /I 36 72 53 51 Cation - Anion Balance % -8.6 0.7 4.6 -3.4 Cations me /I 11.4 13.5 12.3 11.4 Chloride m /I 4 12 6 5 B Conductivity µmhos/cm 1090 1190 1145 1120 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 21 47 28 24 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.05 1.80 0.44 0.05 B Iron, total m /I 1.36 37.70 8.42 1.04 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 2.4 4.7 3.2 3.2 Manganese, dissolved m /I 0.012 0.18 0.05 0.006 B Manganese, total m /I 0.046 0.872 0.204 0.047 Mercury, total m /I -0.0002 0.0003 0.0002 -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 1.14 0.24 -0.02 U Nitrite as N m /I H SU 8.4 8.8 8.6 8.7 H Phosphate m /I 0.46 1.36 0.72 0.37 Phosphorus Ortho , dissolved m /I 0.15 0.44 0.23 0.12 Potassium, dissolved m /I 1.4 5.0 2.1 1.5 B Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 -0.001 U Sodium Absorption Ratio SAR calc. 16.30 27.60 23.03 22.10 Sodium, dissolved m /I 248 295 266 248 Sulfate m /I -10 60 27 30 B TDS Ratio calc. 0.96 1.21 1.04 1.13 TDS Calc. m /I 664 752 715 657 TDS m /I 650 910 742 740 TSS m /I 20 754 192 34 Zinc, dissolved mg/I -0.01 0.19 0.04 0.02 B 1 Baseline 2006 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels 4 Average (mean) value calc using 112 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). West Elk Mine E-32 , 2007 Annual Hydrology Report HydroGeo, Inc.