15 



m 



a 



1991 



D 1992 



Figure 3.3 TDS Concentrations for 1991 Grab Samples from East Poplar River at 

 the International Boundary. 





CO 



Q 



1600 

 1500 

 1400 

 1300 



Short-Term Objective (1500 mg/L) 



from sample analysis 

 from regression 



1974 1976 1978 1980 1982 1984 1986 1988 1990 



1975 1977 1979 1981 1983 1985 1987 1989 1991 



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

 River at the international Boundary. 



