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Upper North Fork (USGS) Surface Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location N. Fork Upper (USGS) Baseline 2003 Water Year DesCri lion Units Minimum Maximum Mean 5/5/2003 6/2/2003 9/29/2003 Field Parameters Flow cfs 2.38 4.4 NM Electrical Conductivit umhos/cm 228 98 184 H SU 7.38 8.02 7.44 Tem erature oC 37.2 52.4 48.4 Comment Laborato Parameters Name of Certified Lab ACZ ACZ ACZ Lab Reference # L41121-02 L41471-02 L43143-09 Sam le Date 5!7/2003 6/2/2003 9/29/2003 Lab Test Date 5/7-5/15 6/5-6/12 10/02-10/21 Sam led B Alkalini Total CaCO3 m /I 68.000 Aluminum, dissolved m /I 0.05 Anions me /I 7.3 Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 0.001 0.0005 Bicarbonate m /I 40.9 167 81.3 68 Boron, dissolved m /I -0.07 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 22 Carbonate m /I -2 Cation -Anion Balance m /I 13.3 Cations me /I 1.7 Chloride m /I 10 3 1 Conductivit umhos/cm 76 241 t69 120 82 142 Co er, dissolved m /I 0.01 0.07 0.01 -0.01 Hardness m /I 40 107 70 70 H droxide m /I -2 Iron, dissolved m I 0.38 0.09 0.05 0.09 0.04 Iron, total m 1 26.3 1.6 2.06 2.18 0.2 Lead, dissolved m /I o.o2 0.01 -0.04 Lead, total m /1 Ma nesium, dissolved m /I 2 3.4 2.9 3.7 Man anese, dissolved m /I 0.009 0.006 -0.005 0.008 -0.005 Man anese, total m /l 0.19 0.04 0.029 0.077 0.012 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.01 Nitrate as N ,dissolved m n Nitrate/Nitrite as N m A 0.79 0.06 -0.02 Nitrite as N ,dissolved m /I H SU 6.7 9 7.8 7.6 7.4 8.1 Phos hate m /I -0.03 Phos horns Ortho ,dissolved m /I 7.6t 0.12 -O.Ot Potassium, dissolved m /I 0.8 Selenium, total m /I -0.001 Sodium Absor lion Ratio SAR talc. 0.2 1.62 0.5 0.32 Sodium, dissolved m /I 3.a 5.7 4.6 6.1 Sulfate m /I 70 10 -10 TDS Ratio talc. 1.2 TDS Calc. m /I 75 TDS m A 30 650 109 80 60 90 TSS m /I 636 55 42 56 6 Zinc, dissolved m /I -0.01 ACZ -ACZ Labs, Steamboat S rin s, Colorado ' Standard is for reference ur ses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine C-1 2003 Annual Hydrology Report HydroGeo, Inc.