16 

 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 exceedences over the course of the year. In the table, multiple replicate samples 

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

 exceedences noted in the suite of replicate sample is charged against the single sample noted. 

 There were no exceedences for any parameter measured. The January 17 Canadian sample 

 revealed a dissolved oxygen concentration of 4 mg/L, which is equal to the objective value. 

 Dissolved oxygen levels can be expected to be lower during ice-covered conditions, and low- 

 flow summer conditions where oxygen has been reduced by biological activity. 



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

 the International Boundary, recommended by the International Poplar River Water-Quality 

 Board to the UC. Revisions to the objectives were made in 1992 as outlined in the 1992 

 annual report. Objectives for un-ionized ammonia, mercury in fish, and pH require further 

 definition. No excursions occurred in 1995. 



