The potentiometric surface in the Fox Hills/Hell Creek artesian aquifer (well 11) has shown very little 

 fluctuation or change throughout the 26-year (1979-2004) 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 change caused by climate and/or precipitation. Water 

 levels in wells 5, 10, and 24 responded strongly to the heavy snow accumulation and runoff in early 

 2004. Water levels in well 8 also responded but upward movement was only about 2 ft. The water level 

 m well 23 rose about 2 ft in response to the snowmelt but dropped back to its late 2003 levels by the 

 end of 2004. Hydrographs of selected alluvial wells (10, 23, and 24) and the Fox Hills/Hell Creek 

 artesian aquifer well (1 1) are shown in Figure 3.17. 



Hydrographs of Selected Wells 

 Alluvium and Fox Hills/Hell Creek Aquifers 



2440 



2430 



2425 



III 



a 2420 



« 2415 



2410 



°^s/s&a^ Js Gtf m ™ t^B c^a^^_^ 1^ ,^ ^^3.fls^^3a^aa 0^ [tf 3)3 c^ i^:y-^^jatb 0% 





^^w/ylr^'^Vy^r'' 



_l I I I I I L_ 



0)0'^CMW^tn<ot^ooo)QT-cvi«5-intpr-.ooo>Qi-c\jco3!i)tor; 

 t^opcocpopopcoopcpopopaSo)cpo>ao>aa>cpa>pcp<:pooooc^ 



Year 



-Well 10 (GWIC 4340) -b- Well 11 (GWIC 4329) -a- Well 23 (GWIC 124105) -x- Well 24 (GWIC 144835) 



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



25 



