- 35 - 



Table 4. — Recommended water quality objectives and excursions, 

 1990 sampling program, East Poplar River at the International Boundary 



[units in mg/L except as otherwise noted] ) 



Parameter 



Objective 



No. of samples 

 USA Canada 



Excursions 

 (No. /Year) 



Objectives recommended by IJC to Governments 



Boron-total 



Total dissolved solids 



3.5/2.5(» ) 



1, 500/1, 000(» ) 



nil 

 nil 



Objectives recommended by Poplar River Board to IJC 



Aluminum-dissolved 



Ammonia un-ionized (as N) 



Cadmium-total 



Chromium- total 



Copper -dissolved 



Copper-total 



Fluoride-dissolved 



Lead-total 



Mercury-dissolved 



Mercury-whole fish (mg/kg) 



Nitrate (as N) 



Oxygen-dissolved 



Sodium adsorption ratio 



Sulfate-dis solved 



Zinc-total 



Water temperature (Celsius) 



pH (pH units) 



Coliform 

 Fecal (no. per 100 mL) 

 Total (no. per 100 mL) 



•Five-year average of flow-weighted concentrations (March to October) should 

 be <2.5 boron and 1,000 TDS . Three-month average of flow-weighted 

 concentrations should be <3.5 boron and <1,500 TDS. 



2 5.0 (minimum April 10 to May 15), 4.0 (minimum remainder of year). 



3 Natural temperature (April 10 to May 15), <30 degrees Celsius (remainder of 

 year) . 



4 Less than . 5 pH units above natural, minimum pH = 6.5, 



