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Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.73 <br />0.20 <br />0.7 <br />8.1 <br />7.4 <br />5/5/10 <br />11/10/08 <br />Increasing <br />Lab Cond. <br />2606.50 <br />221.63 <br />790 <br />2860 <br />2070 <br />6/03/09 <br />05/05/10 <br />Decreasing <br />TDS <br />2183.50 <br />87.38 <br />310 <br />2330 <br />2020 <br />3/17/09 <br />08/17/11 <br />Decreasing <br />Sulfate <br />900.58 <br />73.52 <br />332 <br />1090 <br />758 <br />8/2/12 <br />5/14/12 <br />Decreasing <br />Calcium <br />211.10 <br />23.40 <br />110 <br />231 <br />121 <br />3/17/09 <br />11 /10 /11 <br />Decreasing <br />Iron <br />0.05 <br />0.00 <br />0.01 <br />0.06 <br />0.05 <br />11/10/08 <br />11/2/09 <br />Decreasing <br />Magnesium <br />200.50 <br />15.64 <br />72 <br />219 <br />147 <br />3/17/09 <br />11/10/11 <br />Decreasing <br />Sodium <br />154.15 <br />19.26 <br />87 <br />181 <br />94 <br />3/13/12 <br />8/13/08 <br />Increasing <br />Elevation <br />6435.25 <br />0.88 <br />3.26 <br />6437.87 <br />6434.61 <br />5/3/11 <br />8/2/12 <br />Increasing <br />- <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.92 <br />0.28 <br />1.6 <br />8.6 <br />7 <br />10/08/98 <br />10/21/02 <br />Level <br />Lab Cond. <br />1923.22 <br />225.76 <br />990 <br />2350 <br />1360 <br />10/08/98 <br />03/29/85 <br />Increasing <br />TDS <br />1405.99 <br />225.67 <br />848 <br />1810 <br />962 <br />10/08/98 <br />03/13/93 <br />Increasing <br />Sulfate <br />538.90 <br />138.11 <br />719 <br />838 <br />119 <br />10/08/98 <br />8/19/09 <br />Increasing <br />Calcium <br />110.41 <br />24.69 <br />190 <br />202 <br />12 <br />11/10/11 <br />11/30/93 <br />Increasing <br />Iron <br />0.96 <br />3.35 <br />28.99 <br />29 <br />0.01 <br />10/08/98 <br />10/21/02 <br />Decreasing <br />Magnesium <br />132.77 <br />26.37 <br />202 <br />217 <br />15 <br />10/08/98 <br />11/30/93 <br />Increasing <br />Sodium <br />164.86 <br />26.49 <br />221 <br />240 <br />19 <br />10/08/98 <br />11/30/93 <br />Increasing <br />Elevation <br />6329.53 <br />2.91 <br />14 <br />6339.09 <br />6325.09 <br />10/03/00 <br />03/28/91 <br />Increasing <br />Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />Gossard Well: <br />MT -95 -02 Well: <br />SPOIL SPRING DEVELOPMENT <br />A limited number of low impact spoil springs are expected to develop occasionally, but <br />their aerial extent and low level or non - existent surface flow will have a very minor <br />impact on surface (and shallow groundwater /perched aquifer) water quality and quantity <br />in the future. <br />