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Middle Dry Fork Surlace Water Ouallty and Field Parameters • • Nlnuntaln Coal West Elk Mine Monitori Location M. D Fork Flume Baseline 2001 Water Year Descri lion Units Minimum Maximum Mean 4/26/2001 6/25/2001 9/29/2001 Field Parametere Flow cfs Electdral Conductive umhos/cm 30 480 213 220 40 70 H SU 7.8 8.5 8.2 8.2 7.7 7.7 Tem ereture oC 3.6 19.8 12 15.6 13.8 13.7 Comment O.G.=0.14 O.G.~.14 O.G.~.27 Laborato Parameters Name of Certified lab - ACZ Lab Reference # L32666.14 Sam le Date 6@6/2001 Lab Test Date N27-7(09 Sam led B R.H. Alkaline Total CaCO3 m 3A 270 142.000 Aluminum, dissolved m 0.07 0.07 0.07 Anions m 1.1 1.1 1.1 Arsenic dissolved m Arsenic, total m 0.002 0.002 0.002 Bicarbonate m 34 270 142 Boron, dissolved m Cadmium dissoved m CalviUm, dissolved m .6.6 56.6 31.96 Carbonate m Cation-Anion Balance m -22.2 -22.2 -22.2 Cations m 0.7 0.7 0.7 Chloride m - 4 1 Conductive umhos/cm 76 76 76 60 Co r, dissoved m Hardness m 23 208 115 H droxide m Iron dissolved m ~ 0.11 0.11 O.ri 0.1 Iron, total m 0.16 14.2 3.14 1.71 Lead, dissolved m Ma nesium, dissolved - m 1.5 17.6 8.7 Man nose, dissolved m 0.029 0.029 0.029 Man anese, total m 0.01 0.432 0.11 Menu ,total m Md enum dissolved m Nitrate as N ,dissolved m 0.57 0.1 Nitmte/Nitrite as N m 0.57 0.12 Nitrite as N ,dissolved m 0.1 0.02 H SU 6.7 6.70 6.7 7.2 Phos dale m 0.33 0.33 0.33 Pfios ns OtiM dissoved m 0.766 0.041 Potassium dissolved m 0.5 0.5 0.5 Selenium, total m Sodium Abso lion Ratio SAR colt. 0.47 1.19 0.78 Sodium dissolved m 5.9 38.8 19.9 Sulfate m so 25 TDS Ratio talc. TDS Calc. m TDS m 50 300 172 30 TSS m 278 72 26 Zinc, dissoved m ACZ Labs Steamboat S do s, Colorado Standard is for retetence ses onl NA - not a livable NM • not measured NR - not re rted West EIk Mlne C•9 2007 Annual Hydrology Report HydroGeo, inc.