3.B 



3.4-- 



3.2 



3.0- - 



a 



2.6- 



1.4- 

 2.2-- 



Boron 2.0 

 (mg/L) 



1.0 

 o.a-t- 

 0.8- - 



0.4-- 



0.2- 



Shopt-term objective (3.5 mg/L) 



-t- calculated data 



mean monthly gnab-sample data 



1979 1980 



Time 



^■•| 



Ki 



^' ^t^ 



2.7-1- 

 2.8-- 



2.S 



2.4-- 

 2.3- 

 2.2- 

 2.1-- 

 2.0-- 

 9-- 



Boron 

 (mg/L) 



Long-term objective (2.5 mg/L) 



M 'I H '114. 



— r— t- r -I r--\-—T~ ■ \-—r~ 



tSaO 19fli 19B2 1983 1984 



Figure 5 (a) Three-month Short-term Flow-weighted Concentration for 

 Boron, East Poplar River at the International Boundary; (b) 

 Five-year Long-term Flow-weighted Concentration for Boron, 

 East Poplar River at the International Boundary 



