18 - 



Table 4. Recommended Water Quality Objectives and Excursions, 1987 

 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 



Objectives recommended by IJC to Governments: 



Boron-total 



Total Dissolved Solids 



Objectives recommended by Board to IJC 



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

 should be <2.5 mg/L boron and <1 000 mg/L TDS. Three-month average of' 

 flow-weighted concentration should be <3.5 mg/L boron and <1 500 mg/LJ 

 TDS. 



5.0 mg/L (minimum (April 10 to May 15), 4.0 mg/L (minimum remainder ofj 

 year) . 



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

 of year) . 



Less than 0.5 pH units above natural, minimum pH a 6.5, 



