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GW -N50, GW -N51, and GW -N52 Well Series: <br />GW -N50 monitors the overburden aquifer and represents the up gradient condition above mining <br />activities. GW -N51 monitors the Dakota coal aquifer, and GW -N52 monitors the underburden <br />aquifer. Both wells also represent the up gradient condition above mining. <br />Summary of the indicator parameters for each well are provided as follows: <br />Lab Con& (yU*9 qp) 2,564 399 1,250 3,140 1,890 fit' # 10/18/08 <br />`'1rDs (mg�lj <br />2,212 <br />313 <br />1,240 <br />2,740 <br />1,500 <br />2/25/15 <br />11/3/08 <br />Sulfate(mg/1) <br />1,184 <br />178 <br />730 <br />1,520 <br />790 <br />2!25115 <br />12/1/11 <br />Calcium (09/1) <br />332 <br />48 <br />198 <br />413 <br />215 <br />3/1/11 <br />11/30/09 <br />Iron (toc rec ug/1) <br />7,442 <br />3,970 <br />15,670 <br />17,500 <br />1,830 <br />5/21/14 <br />2/18/14 <br />Manganese (mg/1) <br />1.17 <br />0.18 <br />0.48 <br />1.44 <br />0.96 <br />3/3/10 <br />2/23/12 <br />Sodium (mg/1) <br />118.9 <br />28.1 <br />87.2 <br />149.0 <br />61.8 <br />3/1/11 <br />10/17/08 <br />Magnesium (mg/1) <br />177 <br />37 <br />142 <br />234 <br />92 <br />3/1/11 <br />10/17/08 <br />GW -N51 <br />Parameter Mean Std Range Max. Min. Max at Min at <br />dev <br />Lab pH <br />6.9 <br />0.6 <br />2.1 <br />7.9 <br />5.8 <br />2/20/13 <br />8/25/09 <br />Lab Cond. (umhos/cm) <br />1,050 <br />122 <br />547 <br />1,410 <br />863 <br />5/22/09 <br />2/10/16_ <br />TDS (mg/1) <br />748 <br />114 <br />535 <br />1,100 <br />565 <br />5/28/09 <br />5/21/14 <br />Sulfate (mg/1) <br />458 <br />122 <br />469 <br />700 <br />231 <br />5/26/09 <br />5/21/14__ <br />Calcium (mg/1) <br />119 <br />21 <br />83 <br />167 <br />84 <br />8/25/11 <br />2/9/17 <br />Iron (toc rec ug/1) <br />17,649_ <br />11,982 <br />49,740 <br />3/2/105/21/14 <br />Manganese (mg/1) <br />1.44 <br />0.542 <br />1.363 <br />_50,600 <br />2.070 <br />_860 _ <br />0.707 <br />8/29/11 _ <br />12/1/10 <br />Sodium (me.) <br />7.9 <br />35.7 <br />50.3 <br />14.6 <br />5/20/09 <br />2/10/16 <br />Magnesium (mg/1) <br />_27.0 <br />51.4 <br />_ <br />10.6 <br />50.1 <br />85.7 <br />35.6 <br />5/20/09 <br />_ <br />2/10/16 <br />151Page <br />