The concentrations of total dissolved solids (TDS) and boron in the East Poplar River 

 were below the long-term and short-term objectives recommended to Governments by 

 the International Joint Commission. However, the five-year flow-weighted concentrations 

 (FWCs) for TDS increased to 950 mg/L, only slightly below the long-term objective of 

 1000 mg/L TDS. The five-year boron FWCs remained well below the long-term objective 

 of 2.5 mg/L boron. The 4.0 mg/L objective for dissolved oxygen was exceeded once. 

 Quality control sample splits showed less than acceptable comparability between 

 Canadian and United States laboratories for some water quality variables. 



The water quality of the common discharge point from the salinity wells is better than that 

 of the reservoir. 



Suspended particulate concentrations exceeded Saskatchewan Environment and Public 

 Safety's 24-hour standard on two occasions. However, these exceedances are believed 

 to have been caused by field-blown dust. 



An estimated 487 830 m^ of ash and 224 200 m^ of supply water were added to the ash 

 lagoons in 1 991 . Regular inspections showed no signs of dyke misalignment or seepage. 

 A more detailed inspection, conducted by an outside consultant, confirmed that the lagoon 

 dykes and liners have good integrity and the ash is contained effectively. 



Extensive testing of the LIFAC desulphurization process took place in the first half of the 



VIII 



