- A7 - 



Two inclinometers were installed in 1986 on the north side of dyke G 

 between the dyke and the cooling water canal to provide additional 

 information on dyke stability. A discharge structure between Ash 

 Lagoon No. 3N and the Polishing Pond was also constructed during the 

 year. 



Saskatchewan Power continues to experiment with the surcharging of 

 dry ash into the lagoons. The present procedure involves several ash 

 discharge points along the north and west sides of Ash Lagoon No. 1. 

 The coarse bottom ash material is selectively collected at the dis- 

 charge points and spread over the finer materials previously laid 

 down. The result should be a surface that is not wind erodible and 

 could support vegetation. It would be graded to a 5 percent slope 

 from the dyke to the middle of the lagoon. 



Saskatchewan Power has, since May 1983, undertaken analyses of filtered 

 ash lagoon water samples to obtain appropriate information on potential 

 leachate quality. Generally, the water quality data show increases in 

 the Ash Lagoons and the Polishing Ponds for sodium, potassium, sulphate, 

 total dissolved solids, fluoride, boron, molybdenum, and strontium; 

 and notable variability in the levels for uranium, and vanadium. In 

 addition, there were some decreases noted for other measured variables 

 such as lead, mercury, and recently, zinc. The changes are to be 

 expected in a closed system of this type. 



