mentation requires assessment. It is difficult to comment on the 

 compatibility of methods relating to zinc and lead, because the Geo- 

 logical Survey uses a dissolved method and Environment Canada uses a 

 total method. Although the data appear incompatible, the concentra- 

 tions were near laboratory detection levels and well below the pro- 

 posed objectives (Table 4). The agency results for dissolved iron 

 were incompatible during the September quality assurance survey. 

 Because of the low concentrations for lead and zinc and the fact 

 that iron is not addressed in the objectives, only boron is a major 

 concern of the sample results. 



Particular attention will be given by government agencies in 1985 to 

 further clarify the interagency compatibility for the above noted 

 parameters. 



Flow-Weighted Concentrations for Comparison to the IJC Objectives 



The 1981 report by the IJC to Governments recommended: 



For the March to October period, a maximum flow-weighted 

 concentration should not exceed 3.5 mg/L for boron, and 

 1 500 mg/L for total dissolved solids for any three con- 

 secutive months in the East Poplar River at the Interna- 

 tional Boundary . 



For the March to October period, a long-term average of 

 flow-weighted concentrations should be 2.5 mg/L or less 

 for boron, and 1 000 mg/L or less for total dissolved 

 solids in the Bast Poplar River at the International 

 Boundary . 



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