o 



17 



1200 



1100 



900 



BOO - 



700 



600 



400 



' I ' I ' I ' I I 



I ' I ' I ' I ' I ' I ' I 



Long-Term Objective (.1000 mgA) 



,1.1,1,1.1 



■ I ■ I ■ 



I ■ I ■ I ' I ■ 



1974 1976 1978 1980 1982 1984 1986 1988 1990 



1975 1977 1979 1981 1983 1985 1987 1989 1991 



Figure 3.5 Five- Year Moving, Flow-Weigiited TDS Concentration for East Poplar 

 River at the Internationai Boundary. 



1500 



CO 

 Q 



1350 - 

 1200 - 

 1050 - 



900 



750 



800 - 



450 - 



300 



150 

 



•r 



•-.-\T 





Sen Slope Estimate (2.63 mg/L/year) 



1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 



Figure 3.6 Sen Slope Estimate for TDS at East Poplar River at the International 

 Boundary. 



