1300 



1200 



1100 



3 1000 



m 

 Q 

 H 900 



800 - 



700 



- • • - 



1992 



N 1993 



Figure 3.3 TDS Concentrations for 1992 Grab Samples from East Poplar River 

 at International Boundary. 



1600 

 1500 

 1400 

 1300 

 1200 

 1100 

 1000 

 900 

 800 

 700 

 600 

 500 

 400 

 300 

 200 

 100 



I ' I '—1 ' I ' I ' 1 ' I ' I ' 



1 ' I ' I ' I ' I ' I ' r 



Short-Term Objective (1500 mg/L) 



from sample analysis, 

 from regression 



_l I I I I ■ I 



1974 1975 1978 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 



Year 



Figure 3.4 Three-Month Moving, Flow-Weighted TDS Concentration for East 

 Poplar River at International Boundary. 



