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Spring 13-1 Water Quality and Field Parameters u • • Mountain Coal West Elk Mine Monitoring Location Spring 13-1 Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/11/2005 6/5/2005 9/19/2005 Field Parameters Flow Electrical CdnduCtivi m umhos/cm 0.3 1302 0.25 1375 0.22 1260 H SU 8.1 8.21 7.73 Tem stature °F ~ 41.3 56.1 58.4 Comment was 24-3-D Laborato Parameters Name of Certified Lab ACZ Lab Reference # L51554-08 Sam le Date 6/0!2005 Lab Test Date 5/9-5/29 Sam led B Alkalini Tolal CaCO3 m /I 522 Aluminum, dissolved m /I 0.73 Anions me /I t2.8 Arsenic, dissolved m /I Arsenic, total m /I o.0ot8 Bicarbonate m /I 552 Boron, dissolved m /I O.t2 Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 15.0 Carbonate m /I 7o Cation -Anion Balance m /I -0.5 Cations me /I 12.6 Chloride m /I 4 Conductivi umhos/cm 1130 Co er, dissolved m /I -O.Ot Hardness m /I 75 H droxide m /I -2 Iron, dissolved m /I 0.65 Iron, total m /I 5.52 Lead, dissolved m /1 -0~~ Ma nesium, dissolved m /I 8.1 Man anese, dissolved Man anese, total m /I m /I 0.036 0.106 Mercu ,total m /1 -0.0002 Mol bdenum, dissolved m /I -O.Ot Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.02 Nitrite as N ,dissolved m /I H SU a.a Phos hate m /1 O.t2 Phos horns Ortho ,dissolved m /I O.Oa Potassium, dissolved m /I 1.9 Selenium, total m /I -0.001 Sodium Abso lion Ratio SAR talc. 12.30 Sodium, dissolved m /I 245 Sulfate m /I to TDS Ratio talc. 1.52 TDS Calc. m /I 693 TDS m /I Ito TSS m /I 150 Zinc, dissolved mg/I -O.Ot ACZ Laborato , Steamboat S tin s, Colorado Ne alive values denote readin s below lab detection levels NA - not a licable NM -not measured NR -not re orted West Elk Mine E-2 2005 Annual Hydrology Report HydroGeo, /nc.