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GW -N47, GW -N48, and GW -N49 Well Series <br />GW -N47 monitors the underburden aquifer directly north of the mining area. GW -N48 monitors <br />the Dakota coal aquifer directly north of the mining area, and GW -N49 monitors the overburden <br />aquifer directly north of the mining area. . <br />Summary of the indicator parameters for each well are provided as follows: <br />aF'�•1 � t, e�a9�` s,1"'s'_« ;M,- '4x':;,f+�-s� ..,-..., .,. .� , a,f� <br />s3 a « Mean Range a Min. `? Min at <br />-: <br />7.6 <br />019 <br />0.70 <br />7.3 <br />) lli�8 <br />5/28/13 <br />'! <br />( ) <br />2 746 <br />348 <br />1 800 <br />4 � <br />> <br />2,260 <br />-"'1044 ' <br />8/25/15 <br />__ <br />S ( ) <br />2,317 <br />307 <br />1,660 <br />3,530 <br />1,890 <br />'11/30 - <br />5/28/13 <br />Sulfate (mg/1) <br />1,363 <br />192 <br />1,070 <br />2,220 <br />1,130 <br />1.0/19/08 <br />8/25/15 <br />Calcium (mg/i) <br />337 <br />38 <br />182 <br />446 <br />264 <br />10/17/08 <br />3/3/10 <br />Iron (toc roe ug/1) <br />17,642 <br />4,286 <br />20,000 <br />27,100 <br />7,100 <br />11/26/12 <br />3/2/10 <br />Manganese (mg/1) <br />1.05 <br />0.21 <br />0.93 <br />1.45 <br />0.52 <br />5/28/13 <br />3/3/10 <br />Sodium (mg/1) <br />134.0 <br />42.8 <br />182.2 <br />245.0 <br />62.8 <br />3/1/11 <br />5/28/13 <br />Magnesium (mg/1) <br />169 <br />33 <br />155 <br />290 <br />135 <br />6/2/10 <br />5/28/13 <br />131Page <br />GW -N48 <br />Parameter <br />Mean <br />Std <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />dev <br />Lab Ph <br />7.0 <br />0.2 <br />0.8 <br />7.3 <br />6.5 <br />5/11/12 <br />8/25/09 <br />Lab Cond. (umhos/cm) <br />1,805 <br />161 <br />660 <br />2,130 <br />1,470 <br />2/20/13 <br />8/17/16 <br />TDS (mg/1) <br />1,476 <br />191 <br />860 <br />2,040 <br />1,180 <br />2/10/16 <br />8/18/14 <br />Sulfate (mg/1) <br />974 <br />140 <br />67_9_ <br />1,430 <br />751 <br />2/10/16 <br />8/18/14 <br />Calcium (mg/1) <br />212 <br />24 <br />87 <br />266 <br />179 <br />3/1/11 <br />8/15/13 <br />Iron (toc rec ug/1) <br />27,458 <br />4,716 <br />21,100 <br />35,1_00 <br />14,0005/17/12_ <br />3/23/10 <br />Manganese (mg/1) <br />1.80 <br />0.20 <br />^ 0.54 <br />2.11 <br />1.57 <br />3/1/11 <br />9/2/10 <br />Sodium (mg/1) <br />52.1 <br />3.6 <br />15.1 <br />58.9 <br />43.8 <br />3/1/11 <br />8/25/15 <br />Magnesium (mg/1) <br />_ <br />108 <br />16 <br />57 <br />142 <br />85 <br />3/1/11 <br />8/25/15 <br />131Page <br />