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GW -N36, GW -N37, and GW -N38 Well Series: <br />GW -N36 monitors the overburden aquifer and represents the up gradient condition above mining <br />activities. GW -N37 monitors the Dakota coal aquifer, and GW -N38 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 />t-1 <br />7.6 <br />0.5 <br />2.7 <br />8,5 <br />5.8 <br />211/14 <br />5/15/06 <br />I.ah Cond. <br />1,456 <br />439 <br />1,327 <br />1,940 <br />613 <br />1 il2W <br />5/31/17 <br />1,017 <br />328 <br />1,012 <br />1,380 <br />368 <br />11/11/15 <br />5/31/17 <br />� Sulfate (mgti) <br />432 <br />101 <br />358 <br />572 <br />214 <br />11/16/16 <br />5/31/17 <br />C um (mg4) <br />153 <br />47 <br />159 <br />216 <br />57 <br />2/23/11 <br />5/31/17 <br />Iron (tot roe u&4) <br />737 <br />633 <br />22,590 <br />2,660 <br />70 <br />12/1/10 <br />7/25/17 <br />Manganese (mg/1) <br />0.121 <br />0.084 <br />0.368 <br />0.400 <br />0.032 <br />8/29/08 <br />5/20/15 <br />Sodium (mg4) <br />70 <br />25 <br />78 <br />101 <br />23 <br />2/23/11 <br />5/31/17_ <br />Magnesium (mg/1) <br />73 <br />26 <br />88 <br />112 <br />24 <br />2/23/11 <br />5/31/17 <br />101Page <br />GW -N37 <br />Parameter <br />Mean <br />Std <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />dev <br />Lab pH <br />4.9 <br />0.7 <br />2.5 <br />6.4 <br />3.9 <br />5/18/16 <br />5/15/06 <br />Lab Cond. (umhos/cm) <br />520 <br />58 <br />222 <br />612 <br />390 <br />5/13/06 <br />7/25/17 <br />TDS (mg(1) <br />310 <br />37 <br />167 <br />_ <br />393 <br />226 <br />5/25/06 <br />7/25/17 <br />Sulfate (mg/1) <br />203 <br />27 <br />119 <br />270 <br />151 <br />5/23/06 <br />7/25/17 <br />Calcium (mg/1) <br />48 <br />_ <br />7 <br />31 <br />_ <br />61 <br />31 <br />5/11/06 <br />_ <br />7/25/17 <br />Iron (tot rec ug(1) _ <br />1,025 <br />1,592_ <br />4,550 <br />_4,600 <br />50 <br />5/18/11 <br />5/23/13_ <br />Manganese (mg/1) <br />0.029 <br />0.013 <br />0.049 <br />0.063 <br />0.014 <br />5/18/16 <br />8/29/12 <br />Sodium (m_g/1) <br />18 <br />2 <br />8 <br />22 <br />14 <br />5/31/17 <br />5/20/15 <br />Magnesium (mg/1) <br />20 <br />3 <br />15 <br />27 <br />12 <br />5/11/06 <br />7/25/17 <br />101Page <br />