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West Elk Mine 2008 Annual Hydrology Report 56 <br />maximum of 0.05 mg/1; total arsenic of 0.003 mg/l compared to baseline maximum of 0.0012 mg/l; <br />dissolved boron of 0.015 mg/l compared to the baseline maximum of below lab detection limits <br />(<0.01 mg/1); dissolved calcium of 22.9 mg/l compared to the baseline maximum of 20 mg/1; <br />chloride of 2.51 mg/l compared to the baseline maximum of 1 mg/l; conductivity of 177.75 <br />µmhos/cm compared to the baseline maximum of 170 mg/1; hardness of about 86 mg/l compared to <br />the baseline maximum of 64 mg/1; dissolved iron of 0.164 mg/I compared to the baseline maximum <br />of 0.10 mg/l; dissolved magnesium of 6.73 mg/l compared to the baseline maximum of 3.5 mg/l; <br />dissolved potassium of 1.27 mg/l compared to the baseline maximum of 1.1 mg/l; sulfate of 21.4 <br />mg/l compared to the baseline maximum of 20 mg/l; TDS of 143 mg/1 compared to the baseline <br />maximum of 120 mg/l; and dissolved zinc of 0.014 mg/l compared to the baseline maximum of <br />below lab detection limits (<0.01 mg/1). <br />One sample was collected for analysis in WY 2008 at the Deer Creek monitoring station in WY <br />2008. The water quality measurements over baseline values at Deer Creek are not mining related, <br />but included dissolved aluminum of 0.641 mg/l compared to the baseline maximum of below lab <br />detection limits (<0.03 mg/1); dissolved boron of 0.83 mg/1 compared to the baseline maximum of <br />0.03 mg/l; dissolved copper of 0.017 mg/l compared to the baseline maximum of below lab <br />• detection limits (<0.01 mg/1); dissolved magnesium of 21.4 mg/I compared to the baseline <br />maximum of 20.4 mg/1; total manganese of 0.06 mg/I compared to the baseline maximum of 0.049 <br />mg/l; nitrate/nitrite of 2.2 mg/I compared to the baseline maximum of 2.07 mg/1; pH of 8.41 s.u. <br />compared to the baseline minimum of 8.5 s.u.; dissolved potassium of 5.09 mg/l compared to the <br />baseline maximum of 3.6 mg/l; total selenium of 0.003 mg/l compared to the baseline maximum of <br />below lab detection limits (<0.001); TDS of 376 mg/l compared to the baseline maximum of 330 <br />mg/l; and TSS of 150 mg/l compared to the baseline maximum of 68 mg/l. <br />One sample was collected for analysis in WY 2008 at the Poison Gulch monitoring station in WY <br />2008. The numerous water quality measurements over baseline values observed in WY 2008 at <br />Poison Gulch are not mining related, but included dissolved aluminum of 0.194 mg/l compared to <br />the baseline maximum of below lab detection limits (<0.03 mg/1); total arsenic of 0.0052 mg/l <br />compared to the baseline maximum of 0.0007 mg/l; dissolved boron of 0.83 mg/l compared to the <br />baseline maximum of 0.03 mg/l; dissolved calcium of 36 mg/l compared to the baseline maximum <br />of 35.5 mg/l; chloride of 1.44 mg/1 compared to the baseline maximum of 1 mg/l; conductivity of <br />317.9 µmhos/cm compared to the baseline maximum of 295 µmhos/cm; dissolved copper of 0.032 <br />mg/l compared to the baseline maximum of below lab detection limits (<0.01 mg/1); hardness of <br />about 134 mg/I compared to the baseline maximum of 124 mg/l; dissolved iron of 0.12 mg/l <br />compared to the baseline maximum of 0.11 mg/l; total iron of 2.58 mg/l compared to the baseline <br />June 2009 HydroGeo, Inc.