3.3.3.2 Montana 



Samples were collected from monitoring wells 7, 16, and 24 during 2004. Well 7 is completed in Hart 

 Coal, well 16 is completed in the Fort Union Formation, and well 24 is completed in alluvium. The 

 TDS concentration in water from two of the three monitoring wells increased in 2004. Changes in TDS 

 with time for wells 7, 16, and 24 are shown in Figure 3.18. 



Total Dissolved Solids 



800 



750 

 a> 

 J 700 



a> 



a 



I 650 



I* 600 



S 



S 550 



CO 



500 



(O 



1 450 



o 

 « 



5 400 



S 



350 



300 



CO o> o i- 



co 00 00 bo Ob 00 



000>0'^OJC«J'S-incDt~~000> 



ooooo)o>a)o>o>o>0)0>0)0> 



cacacocaconjcococOfljcQcocQcococtinscccococococotacocccccc 



—)—3—>—>—i—>—i—i—i—l—i—l—l—i—i—>—)—3—)—>—3—>—i—>—i~i~>~i 



Date 



-»— Well 16 (GWIC4211) -a— Well 24 (GWIC 144835) -A-Well 7 (GWIC4267) 



Figure 3.18 Total Dissolved Solids in Samples from Montana Wells. 



30 



