24 

 22 



20 

 18 

 16 

 14 



le 



10 



e 



6 

 4 



2 - 

 



Boron, in milligram* pwlitar 



•HCO, 



1.62 



0.66 



1. 68 

 —tmaa 



1.04 



WELL 5 WELL 6 WELL 7 WELL 6 



WELL 9 WELL 10 WELL II 



Figure 5 : Average concentrations of major ions and boron from 



selected observation wells in the United States portion 



of the East Poplar River basin (data are composites from 

 1980, 1981, and 1982). 



20. 



