4.0- 



S.t 



2.8- 



-I 2.4 

 >«» 



9 



E 2.0- 



2 I.6H 



O 1-2 

 O 



0.8- 

 Q.4 



0.0 



IJC Rtcommtndtd Long Term 0b|«eliv* (2.3 mg/U 



NAMJJAS0|lllllll|!llllll||llllll|lllllll|llll|ll| 



1975 I 1976 I 1977 I 1978 | 1979 I 1980 I 



1981 



TTrm 



1982 



Figure 2: Five-year long-term moving flow weighted concentrations for 

 - ;>>■ boron an<i TDS in the East Poplar River near the International 

 Boundary, computed using March to October data only, 1975 to 

 1982. Eadh point is the mid -point of a five-year period, 

 that iSi with two and one-half years on either side of the 

 point (see text for further details). 



13. 



