17 

 3.2.5.3 Other Water-Quality Variables 



Table 3.1 contains the multipurpose water-quality objectives for the East Poplar River at the 

 International Boundary, recommended by the International Poplar River Water Quality Board to the 

 IJC. The table shows the number of samples collected for each parameter and the number of times over 

 the course of the year that the objectives were exceeded. In the table, multiple replicate samples 

 collected during the annual quality control exercise are treated as a single sample, but where an 

 objective was exceeded in a replicate sample, this is charged against the single sample noted. As the 

 table shows, all parameters were within the appropriate objectives, with the exception of dissolved 

 oxygen which exceeded the objective once in January. Dissolved-oxygen concentration can be low 

 during winter as a result of ice cover and during low-flow conditions in summer as a result of biological 

 activity. 



