25 - 



3.5 



3.0 



if 2.5 



Cn 



& 2.0 



§ '- 5 



M 



5 1.0 

 PQ 



0.5 

 0.0 



1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



Year 



Figure 17. — Boron grab sample data for East Poplar River at 

 International Boundary for period 1981-90. 



19B1 



982 1983 1984 1985 1986 1987 1988 1989 1990 

 Year 



Figure If 



— Box plots of annual boron concentrations for East Poplar 

 River at International Boundary for period 1981-90. 



