3.3.3.2 Montana 



Samples were collected from monitoring wells 7, 16, and 24 during 2003. Well 7 is completed in Hart 

 Coal, well 16 is completed in the Fort Union Formation, and well 24 is completed in alluvium. The 

 TDS concentration in water from all three monitoring wells decreased in 2003. Changes in TDS with 

 time for wells 7, 16, and 24 are shown in Figure 3.15. 



Total Dissolved Solids 



S 650 



-GWQQC 16 

 -GWQQC 24 

 -GWQQC 7 



Figure 3.15 Total Dissolved Solids in Samples from Montana Wells. 



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