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Upper Dry Fork Surface Water Quality and Field Parameters Mountain Coal West Elk Mine Monitoring Location U. Dry Fork Flume Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/5/2005 6/5/2005 10/2/2005 Field Parameters Flow Staff Gua a o.3z Electrical Conduclivi umhos/cm 236 3a6 730 H SU fi.96 7.01 7.31 Tem erature (°C °C Tem erature (°F °F 42.6 53.3 54.5 Comment submer etl submerged New Lorauon Laborsto Parameters' Name of Certified Lab ACZ Lab Reference # L51525-06 Sam le Date 6/5/2005 Lab Test Date 6/6-s/22 Sam led 8 Alkaline Total CaCO3 m /l Aluminum, dissolved m /I 0.16 o.7s o.ts Anions me n Arsenic, dissolved m /I Arsenic, total m n 0.002 0.002 0.002 Bicarbonate m n zz tao 6a Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 6.8 e.e e.e Carbonate m /I Cation -Anion Balance Cations me /I Chloride m 11 49 7.3 Conductive umh05/cm 43 877 176 258 Co er, dissolved m n Hardness m /I 19 96.5 48.7 H droxide m /I Iron, dissolved m /I 0.3 o.t 0.06 Iron, total m n 0.17 27.2 3.92676471 1.09 Lead, dissolved m n Lead, total m /I Ma nesium, dissolved m /l t2 7.7 t.as Man anese, dissolved m /l o.o7a o.o2a 0.016 Man anese, total m n 0.004 0.45 0.078 Mercu ,dissolved m n Mo bdenum, dissolved m n Nitrate as N ,dissolved m !I Nitrate/Nitrite as N m /I 0.02 ~ o.t3 o.oe Nitrite as N ,dissolved m /I H lab SU 6.1 8.2 7.4 6.2 Phos hate m /I Phos horns Ortho ,dissolved m /I 3.19 0.27 Potassium, dissolved m /I Selenium, dissolved m /I Selenium, total m /I Sodium Abso lion Ratio SAR talc. o.zs 7.16 oss Sodium, dissolved m 1 6.5 6.5 6.5 SUI(ate m n 36 17 TDS Ratio talc. TDS Calc. m /I TDS m /I 30 454 1os 170 TSS m /I 1.8 566 97 16 Zinc, dissolved m /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 Elk Mine C-10 2005 Annual Hydrology Report HydroGeo, Inc.