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Box Canyon <br />Surface Water Quality and Field Parameters <br />• <br />i <br />Mountain Coal West Elk Mine <br />Monitoring Location Box Canyon Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/26/2007 5/24/2007 8/24/2007 <br />Field Parameters* <br />D <br />D <br />D <br />Flow CIPM <br />Electrical Conductivity umhos/cm 840 1020 916 <br />H SU 7.9 8.9 8.3 <br />Temperature °C °C 2.0 15.9 10.0 <br />Temperature °F OF 35.6 60.6 50.0 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity Total CaC03 m /I 401 447 427 <br />Aluminum, dissolved m /I <br />Aluminum, total m /I 0 0.07 0.03 <br />Anions me /1 10.3 12.1 11.1 <br />Arsenic, dissolved m q/1 0 0 0 <br />total <br />Arsenic m /I 0 0.006 0.001 <br />, <br />Bicarbonate m /I 398 447 425 <br />dissolved <br />Boron m /I <br />, <br />Cadmium, total m /I 0 0.003 0.0008 <br />Calcium, dissolved m /I 40.2 67.9 58.0 <br />Carbonate m /I 0 12 2 <br />Cation - Anion Balance % 4 3.6 0.02 <br />Cations me /1 9.5 12.23 11.1 <br />Chloride m /I 2 6 5 <br />Conductivity umhos/cm 868 968 921 <br />dissolved <br />Copper m /l <br />, <br />Hardness m q/1 195 283 255 <br />Hydroxide m q/1 0 0 0 <br />dissolved <br />Iron m /I 0 0.02 0.01 <br />, <br />Iron, total m q/1 0.02 0.44 0.16 <br />Lead, dissolved m /I <br />total <br />Lead m /I <br />- <br />- <br />- <br />, <br />Magnesium, dissolved m /1 23 28 27 <br />Manganese, dissolved m /I <br />- <br />- <br />- <br />Manganese, total m /1 0 0.009 0.002 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N), dissolved m /1 0.13 0.48 0.30 <br />Nitrate/Nitrite as N m /1 0.13 0.48 0.30 <br />Nitrite as N), dissolved m /I <br />H l <br />b SU 8 8.2 8.1 <br />a <br />Phosphate m /I 0 0.03 0.01 <br />Phosphorus Ortho , dissolved m II o 0.007 0.002 <br />dissolved <br />Potassium m /l 2.6 3.3 3.0 <br />, <br />dissolved <br />Selenium m /I 0.001 0.002 0.002 <br />, <br />total <br />Selenium m /I 0 0.003 0.001 <br />, <br />Sodium Absorption Ratio SAR calc. 3.43 4.26 3.91 <br />dissolved <br />Sodium m /I 127 154 141 <br />, <br />lf <br />t <br />S m /I 100 140 118 <br />a <br />e <br />u <br />ti <br />TDS R calc. <br />o <br />a <br />TDS Calc. m /I <br />TDS m /1 540 620 586 <br /> m /1 0 3 8 19 <br />TSS <br />Zinc, dissolved mg/l 0 0.01 0.002 <br />' Baseline and WY 2000 data adapted from WWE (2001). Shaded cells indicate value different from AHR 2000 <br />baseline value due to rounding. <br />2 ACZ Laboratory, Steamboat Springs, CO <br />' Negative values denote readings below lab detection levels <br />C-17 <br />West Elk Mine <br />2007 Annual Hydrology Report <br />HydroGeo, Inc.