32 



4.4.2 Montana 



Sampling for water quality was performed on wells 5-11, 15, 16 and 1 9 in 1 991 . A graph 

 of TDS versus time, for selected wells, is presented in Figure 4.5. There continues to be 

 no significant changes in water quality. 



1200 



200 



Jan-79 Jan-81 Jan-83 Jan-85 Jan-87 Jan-89 Jan-91 Jon-93 



Date 



Figure 4.5 TDS for Selected Wells In the Hart Seam. 



