26 



The potentiometric surface in the Fox Hills/Hell Creek artesian aquifer (well 1 1) has shown very little 

 fluctuation or change throughout the 23-year (1979-2001) monitoring period. 



Water levels in monitoring wells (5, 8, 10, 23, and 24) that penetrate the alluvial and/or outwash aquifer 

 show considerable fluctuation due to seasonal and/or pumping changes; however, they rose during the 

 period 1996 to 1998 and leveled off during 1999, 2000, and 2001. Hydrographs of selected alluvial 

 wells (10, 23, and 24) and Fox Hills well (11) are shown in Figure 3.17. 



Hydrograph of Selected Wells 



Alluvium and Fox Hills Aquifers 



-3- 2430 — ^ 



-Wall 10 

 -Well 11 

 -Wall 23 

 -Well 24 



Figure 3.17 Hydrograph of Selected Wells - Alluvium and Fox Hills Aquifers 



