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GW -N41, GW -N42, and GW -N43 <br />GW -N41 monitors the overburden aquifer up gradient of the mining area. GW -N42 monitors the <br />Dakota coal aquifer up gradient of the mining area, and GW -N43 monitors the underburden <br />aquifer up gradient of the mining area. <br />Summary of the indicator parameters for each well are provided as follows: <br />v'ik .?{�i`p .' f #-r.".:"vi .+:• <br />Mean <br />a <br />Range F 70 <br />f .a 1 4" <br />Min. <br />vfi i inv'#' <br />Min at <br />5/28/09 <br />Iron (tat rec ug/1) <br />8.0: <br />610 <br />2.1:3.' <br />2,430 <br />6.2 <br />:''': <br />6/1/03 <br />tl). <br />0.003 <br />747 <br />131 <br />592 <br />iil20 ' <br />428 <br />6/2/03 <br />5/20/09 <br />15 <br />8 <br />447 <br />'90 <br />363 <br />3i <br />246 <br />3 <br />6/9/09 <br />10 <br />45 <br />115 <br />34 <br />134 <br />186 <br />46 <br />5/19107 <br />5/27/09 <br />Caldwn (ntg11) <br />86 <br />13 <br />57 <br />116 <br />59 <br />5123107 <br />5/28/09 <br />Iron (tat rec ug/1) <br />528 <br />610 <br />2,380 <br />2,430 <br />50 <br />8/23/10 <br />7/26/17 <br />Manganese (mg/1) <br />0.003 <br />0.002 <br />0.005 <br />0.007 <br />0.003 <br />6/15/02 <br />6/2/03 <br />Sodium (mg/1) <br />15 <br />8 <br />25 <br />32 <br />7 <br />6/6/04 <br />5/28/09 <br />Magnesium (mg/1) <br />44 <br />10 <br />45 <br />63 <br />18 <br />5/15/06 <br />5/28/09 <br />GW -N42 <br />Parameter Mean Std Range Max. Min. Max at Min at <br />dev <br />Lab pH <br />6.0 <br />0.5 <br />0.9 <br />6.5 <br />5.9 <br />5/26/02 <br />8/16/02 <br />Lab Cond. (umhos/cm) <br />709 <br />84 <br />152 <br />764 <br />612 <br />5/26/02 <br />6/1/03 <br />TDS (mg/1) <br />469 <br />72 <br />131 <br />517 <br />386 <br />9/4/02 <br />6/16/03 <br />Sulfate (mg/1) <br />_ 243 <br />74 <br />140_ <br />300 <br />160 <br />8/15/02 <br />6/6/03__ <br />Calcium (mg/1) <br />71 <br />10 <br />18 <br />78 <br />60 <br />8/30/02 <br />6/2/03 <br />Iron (tot rec ug/1) _ <br />�.08 <br />Manganese (mg/1) <br />0.06 <br />0.15 <br />0.16 <br />0.01 <br />8/30/02 <br />6/2/03 <br />Sodium (mg/1) <br />_ 33 <br />6 <br />3 <br />_ 36 <br />_ 30 <br />6/4/03 <br />6/9/02 <br />Magnesium (mg/1) <br />37 <br />5 <br />9 <br />41 <br />32 <br />6/9/02 <br />6/2/03 <br />131Page <br />