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GW -N53, GW -N54, and GW -N55 Well Series <br />GW -N53 monitors the underburden aquifer which represents the down gradient condition from <br />mining. GW -N54 monitors the Dakota coal aquifer which represents the down gradient <br />condition from mining, and GW -N55 monitors the overburden aquifer also down gradient of <br />mining. <br />Summary of the indicator parameters for each well are provided as follows: <br />tn) <br />3,251 <br />113 <br />480 <br />3,444 <br />2,960 <br />50/14 <br />8/26/15 <br />TDS <br />2,738 <br />101 <br />470 <br />3,040 <br />2,570 <br />2/25/15 <br />5/28/09 <br />Sulfate (mg/1) <br />1,554 <br />96 <br />430 <br />1,830 <br />1,400 <br />2/25/15 <br />5/26/09 <br />Calcium (n*4) <br />299 <br />14 <br />64 <br />329 <br />265 <br />11/14/14 <br />12/1/10 <br />Iron (toe rec u$/1) <br />179 <br />210 <br />840 <br />860 <br />20 <br />5/30/17 <br />5/20/09 <br />Manganese (mg/1) <br />0.006 <br />0.002 <br />.005 <br />0.010 <br />0.005 <br />3/1/11 <br />3/3/10 <br />Sodium (mg/1) <br />206 <br />22 <br />70 <br />238 <br />168 <br />8/25/11 <br />2/16/16 <br />Magnesium (mg/1) <br />243 <br />13 <br />73 <br />281 <br />208 <br />11/23/11 <br />12/1/10 <br />GW -N54 <br />Parameter Mean Std Range Max. Min. Max at Min at <br />dev <br />Lab pH <br />7.9 <br />0.1 <br />0.5 <br />8.1 <br />7.6 <br />10/18/08 <br />8/20/14 <br />Lab Cond. (umhos/cm) <br />_4,698 <br />1,080 <br />3,960 <br />6,100_ <br />2,140 <br />8/20/14 <br />11/24/10 <br />TDS (mg/1) <br />4,635 <br />1,300 <br />5,280 <br />6,940 <br />1,660 <br />2/25/15 <br />12/8/10 <br />Sulfate (mg/1) <br />3,058 <br />976 <br />4,120 <br />5,030 <br />910 <br />2/25/15 <br />12/7/10 <br />Calcium (mg/l) <br />431 <br />94 <br />333 <br />534 <br />201 <br />11/17/15 <br />9/1/10 <br />_Iron (toc rec >0) <br />5,035 <br />_ 5,107 <br />20,300 <br />21,000 <br />Manganese (mg/1) <br />0.32 <br />0.11 <br />0.29 <br />0.46 <br />Sodium (mg/1) <br />165_ <br />40 _ <br />146 _ <br />213 _ <br />Magnesium (mg/1) <br />594 <br />169 <br />654 <br />880 <br />171Page <br />700 _8/20/14 5/17/12 <br />0.17 3/1/11 6/30/10 <br />67 8/24/09 8/31/10 <br />226 11/17/15 12/1/10 <br />