GROUND WATER QUALITY 



Saskatchewan 



Ground water sampling continued in 1985 at the locations specified in the 



Technical Monitoring Schedules. 



Water Quality in the Tills 



Waters from the tills are of generally poorer quality than those from the 

 Empress Gravels. This is illustrated in Figure 7, where TDS has been 

 plotted for each piezometer. The higher, and more variable concentrations 

 are associated with piezometers completed in till, whereas TDS levels in 

 Empress-completed piezometers rarely exceed 1,200 mg/L. 



Piezometer C712B at location 2a, just to the north of the polishing lagoon 

 displayed an increase in uranium concentration over 1984 to mid-1985. The 

 extremely high uranium values reported in 1985 are possibly questionable, 

 being about ten times the expected level. The first-quarter of 1986 

 results for C712B should be scrutinized to determine whether a real trend 

 is developing, or whether the high uranium concentrations noted in April 

 and July 1985 were in error. No other parameter trends are in evidence at 

 this location. 



Locations 2b (C718) and 2c (C719), near the north edge of the polishing 

 lagoon similarly displayed no consistent water quality trends over the 

 period October 1983 to the end of 1985, although the uranium concentration 

 at C719 fluctuates widely during the period October 1984 to October 1985. 



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