ity Board of the IJC. The permeabilities of ash lagoon No. 1 and 

 No. 2 and polishing pond liners were calculated and found to be in 

 the same order of magnitude (10~ cm/s) as originally calculated 

 by T. A. Prickett. 



The leachate front advancement towards the reservoir is calculated to 

 be 2.5 m since the ponds were initially filled. The water front in 

 the Empress formation is calculated to have advanced to 484 m south- 

 east of the lagoons. Based on Empress formation water chemistry 

 information, lagoon effects were not observed. Leachate flow to 

 Cookson Reservoir and to the East Poplar River was zero. 



Saskatchewan Environment requires that Saskatchewan Power Corporation 

 maintain the stability of the ash system lagoon dykes. In addition 

 to the daily and monthly visual inspections, an annual investigation 

 by a geotechnical engineer was conducted in early May 1984. The mini- 

 mum freeboard of 1.47 m was exceeded in the polishing pond during two 

 periods and in ash lagoon No. 1 in December 1984. The problem in the 

 polishing pond was remedied by water transfer to ash lagoon No. 2. 

 The level in Ash Lagoon No. 1 remained high because this lagoon is 

 now full of ash. New control structures including the previous 

 internal dyke (Lagoon No. 1 - Polishing pond) breach repair were com- 

 pleted in early fall to facilitate recirculation capabilities. 



Saskatchewan Power Corporation has, since May 1983, undertaken analy- 

 ses of filtered ash lagoon water samples to obtain appropriate infor- 

 mation on potential leachate quality. Analysis of ash was also ob- 

 tained. Based on 1983 and 1984 data comparisons, the expected in- 

 creases in the ash lagoons and the polishing pond occurred for: 

 sodium, potassium, chloride, sulphate, total dissolved solids, alumi- 

 num, boron, chromium, and zinc. 



29 



