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Lower Gibble Gulch Surface Water Quality and Field Parameters C~ i Mountain Coal West Elk Mine Monitoring Location L. Gribble Gulch Baseline 2005 Water Year Descri lion UnltS Minimum Maximum Mean 5/4/2005 6/6/2005 9/13/2005 Field Parameters Flow m 35 6.6 D Electrical Conductivit umhos/cm 629 992 H SU zss e.1z Tem erature °C °C Tem stature F °F 54.9 59.3 Comment Laborato Parameters' Name of Certified Lab ACZ Lab Reference # L51525-OB Sam le Date s/s/2005 Lab Test Date 6/a-6/22 Sam led B Alkalinit Total CaCO3 m A Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m !I Arsenic, total m /I 8icafbonale m /I 304 477 353 Boron, dissolved m /I Cadmium, dissolved m !I Calcium, dissolved m /l Carbonate m /I Cation -Anion Balance Cations me tl Chloride m /I 3 5 4 Conductivit umhos/cm 1250 1250 1250 789 Co er, dissolved m /I Hardness ~ m /I 306 460 alt H droxide m /I Iron, dissolved m /I 0.07 Iron, total m /I 0.89 0.44 7.2t Lead, dissolved m /I Lead, total m /I Ma nesium, dissolved m /I 32 39.7 35.9 Man anese, dissolved m /I Man anese, total m /l o.0t5 o.ooa Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N m /1 Nitrate/Nitrite as N m /I 0.05 0.35 0.15 Nitrite as N , tlissolved m /I H lab SU Z2 z2 z2 a.a Phos hate m /1 Phos horns Odho ,dissolved m /I 0.006 0.002 Potassium, dissolved m /l Selenium, dissolved m /I Selenium, total m /I Sodium Absor lion Ratio SAR talc. 0.86 2.5 7.5 Sodium, dissolved m /I s0 zso t35 Sulfate m /I aoo Tao 5so TDS Ratio talc. TDS Calc. m /I TDS m fl 24 60 42 500 TSS m /I 56 Zinc, dissolved mg/I "Baseline, WY 2000, and WY 2001 data ada led from WWE. ACZ -ACZ Laboratories, Inc., Steamboat S rin s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West EIk Mine C-12 2005 Annual Hydrology Report HydroGeo, Inc.