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Year <br />1993 <br />1994 <br />2008 <br />2009 <br />2010 <br />2011 <br />GW -N38 <br />GW -N18 <br />GW -N38 <br />GW -N18 <br />GW -N38 <br />GW -N18 <br />GW -N38 <br />GW -N18 <br />GW -N38 <br />GW -N18 <br />GW -N38 <br />GW -N18 <br />Depth to Water (ft) <br />11.0 <br />28.1 <br />9.5 <br />32.1 <br />4.9 <br />40.2 <br />5.5 <br />35.4 <br />3.4 <br />35.6 <br />3.7 <br />34.8 <br />Elevation of Water (ft) <br />5740 <br />5646 <br />5741 <br />5642 <br />5746 <br />5634 <br />5745 <br />5639 <br />5747.8 <br />5638.6 <br />5747.4 <br />5369.2 <br />pH <br />5.2 <br />6.9 <br />4.5 <br />7.2 <br />7.0 <br />7.0 <br />7.2 <br />7.1 <br />7.3 <br />7.2 <br />7.4 <br />7.1 <br />Calcium (diss, mg /L) <br />53 <br />318 <br />42 <br />286 <br />190 <br />447.8 <br />308 <br />402 <br />262 <br />377.3 <br />190 <br />32.8 <br />Iron (diss, mg /L) <br />0.05 <br />0.02 <br />0.05 <br />0.05 <br />u <br />u <br />u <br />u <br />u <br />0.1 <br />u <br />U <br />Magnesium (diss, mg /L) <br />20 <br />82.5 <br />18 <br />71 <br />18.8 <br />220.5 <br />17.6 <br />231.1 <br />17.6 <br />190.3 <br />15.3 <br />144.2 <br />Bicarbonate (diss, mg /L) <br />12 <br />277 <br />6 <br />273 <br />337 <br />410.8 <br />340 <br />396.3 <br />313 <br />447.8 <br />233 <br />385 <br />TDS (mg /L) <br />348 <br />1479 <br />346 <br />1260 <br />1100 <br />3380 <br />1090 <br />2860 <br />1020 <br />3520 <br />680 <br />2415 <br />Sulfate (mg /L) <br />248 <br />844.5 <br />183 <br />846 <br />420 <br />1920 <br />N/A <br />1590 <br />420 <br />1869 <br />270 <br />1360 <br />N/A - Data not available. <br />Table 6 - Overburden Ground Water Comparison (GW -N38 and GW -N18) <br />SL -14 03DEC12.wpd 66 <br />