24 



3.3.2.2 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 1 997 and 1 998, and have leveled off or dropped 

 slightly during 1 999. Hydrographs of selected Fort Union/Hart Coal wells (6, 7, 1 7, and 1 9) are shown 

 in Figure 3.16. 



Hydrograph of Selected Wells 



Fort Union - Hart Coal Aquifers 

 ?2460 



::'2458 

 g 2456 

 •2 2454 



cd 



I 2452 

 I 2450 



CO 



-g 2448 



Hi 



I 2446 



17 



19 



Jan-79 Jan-82 Jan-85 Jan-88 Jan-91 Jan-94 Jan-97 Jan-00 Jan-03 



Date 



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



