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W -N56. GW -N57. and GW -N58 Well Series <br />GW -N56 monitors the overburden aquifer up gradient of the mining area. GW -N57 monitors the <br />Dakota coal aquifer up gradient of the mining area, and GW -N58 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 />} :r,,��s :erg „ . +"rfi ..'i'?�'�"f'�-`�'`.���-,`!`` iV'��-���`X �i`.d �'�;'�'.``.' •�%' <br />Mean r. Range , Min. Y Min at <br />kit <br />7.7 <br />0.1 <br />0.4 <br />7.9 <br />7.5 <br />2/19/13 <br />5/17/16 <br />Lab Cond. (umhos/cm) <br />7.8 <br />0.11 <br />0.4 <br />$,1i <br />7.6113 <br />8/9/17 <br />11/27/12 <br />T.a) m�bo*d m <br />3,974 <br />278 <br />990 <br />4,440 <br />3,450 <br />8/14/1 <br />8/26/15 <br />Iw Owl 11 <br />3,616 <br />300 <br />950 <br />4,070 <br />3,120 <br />5!`$113 <br />8/29/12 <br />`Sulfate <br />2,245 <br />230 <br />700 <br />2,600 <br />1,900 <br />.5/28113 <br />5/26/15 <br />Calcium (09//1) <br />522 <br />69 <br />288 <br />606 <br />318 <br />5/17/16 <br />8/29/12 <br />Iron (toc rec ug/1) <br />0.26 <br />0.47 <br />1.77 <br />1.78 <br />0.01 <br />5/17/17 <br />8/29/12 <br />Manganese (mg/1) <br />352 <br />46 <br />151 <br />429 <br />278 <br />5/17/17 <br />11/27/12 <br />Sodium (mg/l) <br />183 <br />59 <br />254 <br />395 <br />141 <br />11/27/12 <br />5/17/16 <br />Magnesium (mg/1) <br />29 <br />3 <br />17 <br />36 <br />19 <br />8/9/17 <br />8/29/12 <br />GW -N57 <br />Parameter Mean Std Range Max. Min. Maas at Min at <br />dev <br />Lab pH <br />7.7 <br />0.1 <br />0.4 <br />7.9 <br />7.5 <br />2/19/13 <br />5/17/16 <br />Lab Cond. (umhos/cm) <br />4,579 <br />259 <br />1,090 <br />4,980 <br />3,890 <br />8/9/17 <br />8/26/15 <br />TDS (mg/1) <br />4,582 <br />332 <br />1,440 <br />5,280 <br />3,840 <br />9/21/16 <br />5/26/15 <br />Sulfate (me) <br />3,058 <br />277 <br />1,160 <br />3,650 <br />2,490 <br />9/21/16 <br />5/26/15 <br />Calcium (mg/1) <br />511 <br />19 <br />66 <br />544 <br />478 <br />11/17/15 <br />5/17/16 <br />Iron (toc rec ug/1) <br />5,347 <br />6,883 <br />31,310 <br />32,400 <br />1,090 <br />2/26/15 <br />11/14/14 <br />Manganese (mg/1) <br />0.62 <br />0.22 <br />0.73 <br />0.99 <br />0.26 <br />8/9/17 <br />8/20/14 <br />Sodium (mg/1) <br />144 <br />24 <br />17_4_ <br />101 <br />2/17/14_ <br />5_/26/15 <br />Magnesium (mg/1) <br />506 <br />_ <br />47 <br />---73------- <br />184 <br />574 <br />390 <br />11/9/16 <br />5/26/15 <br />191Page <br />