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Spring J-7 <br />Water Quality and Field Parameters <br />• <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location : Spring J-7 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean a 4/27/2007 5/30/2007 Q 5 8/23/2007 <br />Field Parameters <br />Flow m 0.19 9.09 4.29 9.00 5.00 D - <br />Electrical Conductivity µmhos/cm 242 496 376 360 413 <br />H SU 6.55 8.25 7.60 8.25 7.68 <br />Temperature OF 49.4 69.8 59.7 55.9 65.5 <br />Temperature °C 9.7 21.0 15.4 13.3 18.6 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 ACZ <br />Lab Reference # L62931-12 <br />Sample Date 5/30/2007 <br />Lab Test Date 5/31-6/21 <br />Sampled B <br />Alkalinity (Total CaC03) mg/I 121 188 142 136 <br />Aluminum, dissolved m /I -0.03 0.05 0.03 -0.03 U <br />Aluminum, total m /I <br />Anions me /l 2.7 4.4 3.8 4.0 <br />Arsenic, dissolved m /I <br />Arsenic, total m q/1 -0.005 0.0008 0.002 -.0005 U <br />Bicarbonate m /I 116 188 140 136 <br />Boron, dissolved m /I -0.01 0.02 .02 B <br />Cadmium, dissolved m /I -0.005 -0.005 -.005 U <br />Calcium, total m /I <br />Calcium, dissolved m /I 21.1 33.9 30.3 33.9 <br />Carbonate m /I -2 7 1 -2 U <br />Cation - Anion Balance % -7.3 0 -2.60 3.6 <br />Cations me /I 2.6 4.3 3.6 4.3 <br />Chloride m /I 2 4 3 3 B <br />Conductivity µmhos/cm 250 426 354 383 <br />Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U <br />Hardness m /I 79 125 107 116 <br />Hydroxide m /l -2 -2 -2 -2 U <br />Iron, dissolved m /I 0.02 0.11 0.05 0.03 B <br />Iron, total m /I 0.53 1.96 1.02 2.93 <br />Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U <br />Magnesium, dissolved m /I 6.3 9.9 7.5 7.6 <br />Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U <br />Manganese, total m /I -0.005 0.037 0.019 0.038 <br />Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U <br />Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U <br />Nitrate as N m /I <br />Nitrate/Nitrite as N m /I -0.02 0.33 0.16 -0.02 U <br />Nitrite as N m /I <br />H SU 7.6 8.4 8.2 8.2 H <br />Phosphate m /I -0.03 0.24 0.09 0.18 <br />Phosphorus Ortho , dissolved m /I -0.01 0.08 0.03 0.06 <br />Potassium, dissolved m /I 1.2 2.2 1.62 1.5 B <br />Selenium, dissolved m /I <br />Selenium, total m /I <br />Selenium, total recoverable m /I -0.001 -0.001 -0.001 -0.001 U <br />Sodium Absorption Ratio SAR calc. 1.19 1.61 1.41 1.87 <br />Sodium, dissolved m /l 23.9 41 33.2 45.7 <br />Sulfate m /I 10 60 44 60 <br />TDS Ratio calc. 0.99 1.38 1.14 1.07 <br />TDS Calc. m /I 138 234 205 2331 1 <br />TDS m /I 190 270 230 2501 1 <br />TSS m /I -5 24 10 721 1 <br />Zinc, dissolved mg/I 0.01 0.03 0.02 0.01 U <br />' Baseline 2006 <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels <br />4 Average (mean) value calc using 112 of detection limit for readings below lab detection limits unless all readings are below lab detection limit <br />5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />E-33 2007 Annual Hydrology Report HydroGeo, Inc.