29 - 



3.0 



2.6 



►^ 2.2 



E 1.8 



C 1 .4 

 O 

 U 



O 1.0 

 PQ 



0.6 

 0.2 



i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — i — | — r 



Long-Term Objective (2.5 mg/L) 



-i I i I i L 



J l I l L 



J I I i I I L 



1 974 1 975 1 976 1 977 1 978 1 979 1 980 1 981 1 982 1 983 1 984 1 985 1 986 1 987 1 988 1 989 1 990 



Year 



Figure 23 . --Five-year moving, flow-weighted boron concentration 

 for East Poplar River at International Boundary. 



The relationship between boron and specific conductance at the East 

 Poplar River sampling location during the period 1975-1990 is described 

 by the equation: 



boron = (0.00149 x specific conductance) - 0.275 

 (R 2 =0.71, n=398) 



Mercury in Cookson Fish 



Mercury levels in fish in the Cookson Reservoir have been measured on 

 four occasions, in 1979 and 1983 by Environment Canada (Water Quality 

 Branch, 1980; Munro, 1985), and in 1980 and 1984 by Saskatchewan Environ- 

 ment (Waite and others, 1980) . These fish were collected for the purpose 

 of meeting consumptive guidelines. The fish are confined to Cookson 



