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GW -N44, GW -N45, and GW -N46
<br />GW -N44 monitors the overburden aquifer and represents the down gradient condition. GW -N45
<br />monitors the Dakota coal aquifer, and GW -N46 monitors the underburden aquifer and represents
<br />the down gradient condition.
<br />Summary of the indicator parameters for each well are provided as follows:
<br />P 7.8 {), "` 1.9 8.61 6.7 �:�lt� 6/1/03
<br />Lab C6n4. 3,460 1,640 10,640 12,300 1,660 ", O 11/16/16
<br />TDS (mg/i) 3,282 1,875 12,380 13,800 1,420 6/611,7 8/3/17
<br />Sulfate {muil) 2,120 1,34' 8,766 9,510 744 6%6/17 8/3/17
<br />Calcium (mg/1)
<br />387
<br />76
<br />362
<br />514
<br />152
<br />3/13/02
<br />6/6/17
<br />Iron (tot rec ug/1)
<br />6,850
<br />14,084
<br />61,510
<br />61,600
<br />90
<br />5/17/12
<br />8/29/12
<br />Manganese (mg/1)
<br />0.40
<br />0.44
<br />1.46
<br />1.46
<br />0.00
<br />6/6/17
<br />8/23/11
<br />Sodium (910)
<br />183
<br />190
<br />1,321
<br />1,350
<br />29
<br />6/6/17
<br />11/12/13
<br />Magnesium (mg/1)
<br />301
<br />261
<br />1,873
<br />1,970
<br />97
<br />6/6/17
<br />11/12/13
<br />GW -N45
<br />Parameter Mean Std Range Max. Min. Max at Min at
<br />dev
<br />Lab pH
<br />8.2
<br />0.2
<br />1.7
<br />8.8
<br />7.1
<br />2/19/14
<br />6/1/03
<br />Lab Cond. (umhos/cm)
<br />6,991
<br />3,348
<br />12,840
<br />14,700
<br />1,860
<br />5/20/15
<br />6/6/17
<br />TDS (mg/1)
<br />6,971
<br />5,119
<br />17,140
<br />18,600
<br />1,460
<br />11/14/12
<br />6/6/17
<br />Sulfate (mg/1)
<br />4,238
<br />3,985
<br />13,030
<br />13,400
<br />370
<br />8/17/15
<br />12/28/01
<br />Calcium (mg/1)
<br />107
<br />66
<br />279
<br />307
<br />28
<br />11/14/12
<br />2/17/06
<br />Iron tot rec u
<br />1,099
<br />1,226 _
<br />5,800
<br />5,900 100
<br />Manganese (mg/1)
<br />0.31
<br />0.57
<br />1.92
<br />1.92 .002
<br />Sodium (mg/1)
<br />1,037
<br />255 _
<br />1,479
<br />1,520 41
<br />Magnesium (mg/1)
<br />770
<br />866
<br />2,734
<br />2,800 66
<br />151Page
<br />11/12/13_ 11/14/12
<br />3/14/17 _ 6/6/17
<br />11/14/12 _6/6/_1_7
<br />11/14/12 3/13/02
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