- 19 - 



1500 



1350 



1200 



1050 



\ 900 



§, 750 



^ 600 



450 



300 



150 







1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



Year 



Figure 8 



--TDS grab sample data for East Poplar River 

 at International Boundary for period 1981-90 



1500 

 1350 



1200 - 

 1050 - 



\ 900 



en 



£ 750 - 



00 600 



Q 



I- 450 



300 



150 







I 



$ ^ y ^ M ? 



1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



Year 



Figure 9. — Box plots of annual TDS concentrations for East Poplar 

 River at International Boundary for period 1981-90. 



