TDS 

 (mg/L) 



1700-r 



1800 4- 



tsoo-- 



1400 

 1300' 



iaoo-|- 



1100-- 



1000 -f 

 900 



aoo- 



700-- 

 B00-- 

 900-- 

 400-- 

 »00-- 



- a 



Short-term objective (1500 mg/L) 



■•- calculated data 

 mean monthly grab sample data 



■^ j+\ .+; 





- b 



TDS 

 (mg/L) 



Long-term Objective (1000 titg/L) 



1979 1980 



Time 



Figure 4 (a) Three-month Short-term Flow-weighted Concentration for 

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

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

 East Poplar River at the International Boundary 



