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 3.5 Air Quality 



3.5.1 Saskatchewan Environment and Resource Management 



Ambient sulphur dioxide (SO2) monitoring was discontinued on March 30, 1 992. During the 3-month 

 period of 1992, ambient sulphur dioxide monitoring recorded no violations of Saskatchewan 

 Environment and Resource Management's hourly and 24-hour average standards of 0.17 and 0.06 

 parts per million (ppm), respectively. The highest recorded hourly value of 0.082 ppm SO2 was 

 recorded on March 27th at 13:00 hours, as compared to 0.137 ppm SO2 recorded in September 

 1 991 . The highest 24-hour average reading of 0.011 ppm occurred on March 27th as compared with 

 1991's highest average reading of 0.11 ppm. There was no downtime for the monitor during the 3- 

 month period. 



The High-Volume Sampler was also discontinued on March 30, 1992. Suspended particulate 

 concentrations obtained from the monitor at the same site for the 3-month period did not exceed 

 Saskatchewan Environment and Resource Management's 24-hour average standard of 120 

 micrograms per cubic metre (ng/m^) per 24 hours as compared to the two occasions in 1991 in 

 September and October at 162.2 ^ig/m^, and 197.7 ^ig/m^ respectively. The annual geometric mean 

 was not calculated for 1992 and there was no downtime for the 3-month period as compared to 3.3 

 percent downtime for 1991 . 



3.5.2 SaskPower Corporation 



SaskPower Corporation's (SPC) ambient SO2 monitoring for 1992 recorded no violations of 

 Saskatchewan Environment and Resource Management's hourly and 24-hour average standards. 

 The highest recorded hourly value of 0.067 ppm SO2 was recorded on October 9, 1992 at 11:00 

 hours. 



