25 



3 J.2.2 Montana 



Water-levels in monitoring wells (6, 7, 9, 13, 16, 17, 19, and 22) that penetrate the Fort Union 

 Formation and/or Hart Coal Seam were rising during 1997 and 1998, and have leveled off or dropped 

 slightly during 1999 and 2000. Hydrographs of selected Fort Union/Hart Coal wells (6, 7, 17, and 19) 

 are shown in figure 3.16. 



2456 



a 2450 



Hydrograph of Selected Wells 



Fort Union - Hart Coal Aquifers 



-W19 



Jan-79 Jan-81 Jan-83 Jan-85 Jan-87 Jan-89 Jan-91 Jan-93 Jan-95 Jan-97 Jan-99 Jan-01 



Date 



Figure 3.16 Hydrograph of Selected Wells - Fort Union-Hart Coal Aquifers 



