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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 />r^�"'"�Yr..' ,�,-•�. �� �4''` ��� _ �j�{a <br />f'f., 4 �„: <br />'`t.,{F', <br />t.: <br />hte. tii�n.7.�r"a4 .at <br />��'Ma <br />f �+,'i 'N" <br />FLt'=`�JNe. p "'r:,'Yk: � <br />,av'r t <br />`e� , <br />i.• tY Y' '' . <br />Range <br />Min. <br />'$' <br />M <br />';r,i..�.:«ki,G'rtsws�':4's�^,,' ''t:.i.it:='Y <br />7a''9i'' <br />7,442 <br />:u7�:r;r <br />"!�' _ <br />rr,' <br />1,830 <br />5/21/14 <br />7.7 <br />t% <br />0.8 '$.1 <br />7.3 ',&3/10 <br />8/25/09 <br />K Ub Cw (t lzxtt) . <br />2,564 <br />399 <br />1,250 3,140 <br />1,890 2125/09 <br />10/18/08 <br />TDS-(»*1) <br />2,212 <br />313 <br />1,240 2,740 <br />1,500 , 2/25/15 <br />11/3/08 <br />Sulfate (mg/1) <br />1,184 <br />178 <br />730 1,520 <br />790 2/25/15 <br />12/1/11 <br />Calcium (mg/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___50,600 <br />860 <br />3/2/10 <br />5/21/14 <br />Manganese (mg/1) <br />1.44 <br />0.542 <br />1.363 <br />2.070 <br />0.707 <br />8/29/11 <br />12/1/10 <br />Sodium (mg/1) <br />27.0 <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 />51.4 <br />10.6 <br />50.1 <br />85.7 <br />35.6 <br />5/20/09 <br />2/10/16 <br />151Page <br />