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Lower North Fork Surface Water Quality and Field Parameters C J • Mountain Coal West EIk Mine Monitoring Location N. Fork Lower Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/10/2003 5/5/2003 6/2/2003 9/29/2003 Field Parameters FIOw ds NM NM NM Electrical Conductivi umhoslcm 234 96 192 H SU 7.42 8.06 7.03 Tem erature OC 38.2 52.3 51.4 Laborato Parameters Name of Certified Lab ACZ ACZ ACZ Lab Reference # L41121-01 L41471-01 L43143-08 Sam le Date 5/5/2003 6/2/2003 9/29/2003 Lab Test Date 5n-5/15 6/5-6/12 09/30.10/21 Sam led B Alkalini Total CaC03 m /I 68 Aluminum, dissolved m I -0.03 AnlOns me /I 1.3 Arsenic, dissolved m I Arsenic, total m /I 0.0004 Bicarbonate m /I 41 138 78 68 Boron, dissolved m I -0.01 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 20.9 Carbonate m /I -2 Cation -Anion Balance m /I 10.3 Cations me /I 1.s Chloride m /I 1.6 8 3.8 1 Conductivi umhos/Cm 125 84 142 Co er, dissolved m /I -0.01 Hardness m /I 39.3 109 68.7 67 H droxide m /I -2 Iron, dissolved m /I 0.126 0.065 0.06 0.08 0.02 Iron, total m /I 0.09 3.8 0.92 2.28 2.14 0.23 Lead, dissolved m /I -0.04 Lead, total m /I Ma nesium, dissolved m /I 3.5 Man anese, dissolved m I 0.0002 0.05 0.01 -0.005 0.007 -0.005 Man anese, total m /I 0.033 0.061 0.013 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I -0.02 Nitrite as N ,dissolved m /1 H SU 7 8.8 8.1 7.8 7.4 B Phos hate m A -0.03 Phos horns Ortho ,dissolved m /I 2.74 0.25 -0.01 Potassium, dissolved m /I 0.7 Selenium, total m /I -0.001 Sodium Absor tion Ratio SAR talc. 0.36 Sodium, dissolved m /I 6.8 Sulfate m /I 4 25 12 -10 TDS Ratio talc. 1.22 TDS Calc. m I 74 TDS m I 36 180 101 80 60 90 TSS m /I 6.4 107 36 42 60 -5 Zinc, dissolved m /I -0.01 ACZ Labs, Steamboat S rin s, Colorado Standard is for reference ur ses onl NA - not a livable NM -not me NR -not re orted West Elk Mine C-2 2003 Annual Hydrology Report HydroGeo, /nc.