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Lower Dry Fork Surface Water Quality and Field Parameters • • C-8 Mountain Coal West Elk Mine Monitoring Location L. D Fork Flume Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/1/2005 6/52005 9/6/2005 Field Parameters Flow Staff Gau a or cfs 0.16 0.07 o.ao Electrical CondUCtivi UmhOS/Cm 709 1773 435 H SU 7.9 8.46 8.50 Temperature C) C Tem stature F) 47.2 57.8 61.5 Comment Laborato Parameters' Name of Certified Lab ACZ Lab Reference # L51525-02 Sam le Date 6/52005 Lab Test Date 6/8-620 Sam led B Alkalini Total CaCO3 m /I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /! Bicarbonate m /I 118 324 220 Boron, dissolved m I Cadmium, dissolved m /I Calcium, dissolved m /l 87.9 87.9 87.9 Carbonate m ll Cation -Anion Balance Cations me M Chloride m /I 8.4 4.2 Conductive umhos/cm 207 1920 755 1420 Co er, dissolved m /I Hardness m /I 125 726 360 H droxide m /I Iron, dissolved m /I 0.178 0.049 0.08 Iron, total m /I 0.02 84 5.6 0.21 Lead, dissolved m /I Lead, total m /I Ma nesium, dissolved m /I 9.8 49 29 Man anese, dissolved m /1 0.008 0.013 0.011 Man anese, total m /I 46.4 1,4 Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.1 0.3 0.2 Nitrite as N ,dissolved m /I H lab SU 6.9 9 8.2 8.4 Phos hate m /l Phos horns Ortho ,dissolved m /1 0.763 0.048 Potassium, dissolved m ll Selenium, dissolved m /I Selenium, total m /I Sodium Abso lion Ratio SAR talc. 0.71 1 48 1.11 Sodium, dissolved m ll 69 ss 69 Sulfate m /I 35 613 249 TDS Ratio talc. TDS Calc. m /l TDS m /I 158 1388 581 1060 TSS m /I 1.2 1098 144 -5 Zinc, dissolved mg/I 'Baseline, WY 2000, and WY 2001 data ado tetl from WWE. ACZ -ACZ Laboratories, Inc., Steamboat S rin s, CO Ne ative values denote readin s below lab detection levels NM -Not Measured West EIk Mine 2005 Annual Hydrology Report HydroGeo, Inc.