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Horse Gulch <br />Surface Water Quality and Field Parameters <br />• <br />• <br /> <br />Mountain Coal West Elk Mine <br />08 Water Year <br />Baseline <br /> <br />Monitoring Location Horse Gulch <br />Mean5/512003 <br />Units Minimum Maximum 6/7/2008 8/23/2008 <br />i <br />ti <br />Descr <br />p <br />on <br /> <br />arameters <br />Field P = <br /> <br />Dry <br />Dry <br /> m <br />Flow <br />ctivit umhos/cm 240 740 <br /> SU 8.2 8.5 <br />H <br />) °C 5.1 14.7 10.0 13.4 <br />r <br /> <br /> <br />m eters s <br />Name of Certed Lab s <br /># <br />f <br />R <br />erence <br />e <br />Lab <br />t <br />D <br />S <br />l <br />e <br />a <br />amp <br />e <br />t <br />D <br />e <br />a <br />Lab Test <br />d B <br />Sample <br />Alkalinity Total CaC03 m /I 128 332 270 <br />dissolved <br />Aluminum m /l 0.04 0.04 0.04 <br />, <br />i me /I 6.5 6.5 6.5 <br />An <br />ons <br />d <br />l <br />Di <br />i m /I <br />ve <br />sso <br />c, <br />Arsen <br />l <br />i <br />t <br />t m /I 0.001 0.001 0.001 <br />a <br />o <br />Arsen <br />c, <br />t <br />b m /I 128 331 268 <br />ona <br />e <br />Bicar <br />d <br />l <br />di m /I <br />ve <br />sso <br />Boron, <br />dissolved <br />Cadmium m /I <br />, <br />dissolved <br />Calcium m /1 0.004 0.000 <br />, <br />t <br />b m /1 9 2 <br />ona <br />e <br />Car % -4.8 -4.8 -4.8 <br />Cation - Anion Balance 5 <br />9 <br />i me /I 5.9 5.9 . <br />ons <br />Cat <br />hl <br />id m /1 1 5 3 <br />or <br />e <br />C <br />C <br />d <br />ctivit umhos/cm 780 780 780 <br />on <br />u <br />y <br />dissolved <br />Copper m /I <br />, <br />d m /I 89 324 255 <br />ness <br />Har <br />d <br />id m /I <br />Hy <br />rox <br />e <br />l <br />d <br />di m q/1 0.05 0.05 0.05 <br />ve <br />sso <br />Iron, <br />l <br />t <br />t m /I 0.1 3.09 0.83 <br />a <br />Iron, <br />o <br />Lead, dissolved m /I <br />l <br />t <br />t <br />d m /I <br />o <br />a <br />, <br />Lea m /l 7 29.4 [E22 <br />Magnesium, dissolved <br />dissolved <br />Man anese m /l 0.007 0.007 <br />, <br />Man anese, total <br />m /I <br />0.34 <br />l <br />t <br />t <br />M m q/1 <br />o <br />a <br />ercury, <br />Molybdenum, dissolved m /l <br />dissolved <br />Nitrate as N) m /I <br />, <br />Nitrate/Nitrite as N m /I 0.36 0.12 <br />dissolved <br />Nitrite as N) m /I <br />, <br />H <br />l <br />b SU 8.3 8.3 8.30 <br />( <br />a <br />) <br />h <br />h <br />t m /I 0.11 0.11 0.11 <br />P <br />osp <br />a <br />e <br />Phosphorus Ortho), dissolved m /I 0.037 0.011 <br />Potassium, dissolved m /I 3.6 3.6 3.6 <br />Selenium, dissolved m /I <br />total <br />Selenium m /I <br />, <br />Sodium Absorption Ratio SAR calc. 0.72 1.35 1.2 <br />dissolved <br />Sodium m /I 15.5 54 41.1 <br />, m q/1 10 90 66 <br />Sulfate <br />ti <br />TDS R calc. <br />o <br />a <br />l <br />C m q/1 <br />a <br />c.) <br />TDS <br />m /I 170 440 354 <br />TDS <br />TSS m /I <br />Zinc, dissolved mg/l <br />1 Baseline and WY 2000 data adapted from WWE (2001). <br />West Elk Mine <br />HydroGeo, Inc. <br />C-13 2008 Annual Hydrology Report