25 



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

 fluctuation or change throughout the 21 year (1979-1999) 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. Hydrographs of selected alluvial wells 

 (10, 23, and 24) and Fox Hills well (1 1) are shown in Figure 3.17. 



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



