The potentiometric surface in the Fox Hills/Hell Creek artesian aquifer (well 11, Figure 3.17) has 

 shown little fluctuation or change during the 1979-2005 monitoring period. 



Water levels in monitoring wells (5, 8, 10, 23, and 24) that penetrate alluvium and/or outwash show 

 seasonal change caused by climate and/or precipitation. Water levels in all of the wells responded to 

 the heavy snow accumulation and melt in early 2004. Water levels in well 23 dropped back to late 2003 

 levels by the end of 2004 and water levels in wells 10 and 24 returned to pre-melt elevations in 2005. 

 Water levels in wells 5 and 8 remain above elevations observed in 2002-2003. Hydrographs from 

 selected alluvial wells (10, 23, and 24) and the Fox Hills/Hell Creek well (11) are shown in Figure 

 3.17. Offsets noted in the legend have been applied to the data to separate the traces and make the 

 hydrographs more readable. Measurements from wells 11 and 24 where the wellhead was noted as 

 being frozen are not included. 



V»v*^ 



♦^ 



''''''''''''^''''^-\^.f^^A/ Au:^^ A.:/^V 





■^WK>^A>A r^^'^A Aft^ >^ ^ ^ 



-5-0-5-3-3-3-3-5-5-3-3-3-5-3-3-3-3-3-5-5 



Year 



-Well 10 (GWIC 4340: ft offset) -a— Well 11 (GWIC 4329: +3 ft offset) 



-Well 23 (GWIC 124105: + 2 ft offset) -»«-Well 24 (GWIC 144835: -3 ft offset) 



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



25 



