50 

 An annual inspection to assess the condition of the ash lagoon dykes was conducted on 



October 03, 1991. The Inspection was conducted by Edward A. Wilson, P. Eng. 



representing Clifton Associates Ltd., of Regina, Saskatchewan. Mr. Wilson has been 



responsible for several annual inspections in the past and is familiar with the site. 



The conclusion of his report is that the lagoon dykes and liners have good integrity and 

 the ash Is contained effectively. The lagoon system is performing as designed. The 

 report restates the recommendations that were made in 1990 but had not yet been 

 complied with: (i) the installation of additional monitoring piezometers, and (ii) the 

 dredging of ash by the No. 2 outlet structure. SaskPower plans to complete the 

 installation of the additional monitoring piezometers in the summer of 1992. Dredging by 

 the No. 2 discharge structure is at this time not viewed as a critical issue and has not yet 

 been scheduled. 



7.3 Dyke Stability 



There are three inclinometers located along the toe of Dyke "G" designated SI 101 , 102, 

 and 103, respectively. On an annual basis, these inclinometers are measured and the 

 results are compared to previous readings to determine possible movement over time. 

 The measurements for this reporting period were completed June 19, 1991 . There was 

 no indication of movement in any of the inclinometers. 



The 1982 Ash Lagoon Dyke Slope Stability Study, which was prepared by Clifton 



