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 AIR QUALITY 



Saskatchewan 



Saskatchewan Environment 



Ambient sulphur dioxide (SO2) monitoring began in Coronach in 1979. To 

 date few high concentrations have been recorded. The monitoring site 

 (Coronach Water Treatment Plant) is located 5.0 kilometres north of the 

 power plant, on the southern outskirts of the town of Coronach. There 

 were no recorded violations of Saskatchewan Environment and Public 

 Safety's hourly or 24 hour standards of 0.17 parts per million (ppm) 

 and 0.06 ppm, respectively, in 1988. The highest recorded hourly 

 value of 0.082 ppm was recorded on August 15 at 1200 hours, as compared 

 to 0.071 ppm recorded in September of 1987. Weather information gained 

 from the site indicated that winds at the time were blowing from the 

 northeast. As the power plant is located south of the monitoring 

 location, it can be discounted as the source. The largest 24-hour 

 average readings of 0.009 ppm occurred on April 15, May 13 and August 

 15 and were identical to the highest 24-hour average reading recorded 

 in 1987. Downtime for the monitor during the 12 month period was 4.0 

 percent, mainly due to an episode of windblown damage and a short 

 datalogger malfunction. Figures 13 and 14 show, in graphical form, 

 maximum hourly and daily (24 hour) readings obtained at the monitoring 

 station during the last five years. 



Suspended particulate concentrations obtained from a high volume monitor 



at the same site for the 12 month period did not exceed Saskatchewan 



Environment and Public Safety's 24 hour average standard of 120 micro- 

 's 



grams per cubic metre (ug/m /24 hrs.). The highest reading of 98.5 

 Ug/m /24 hrs occurred on June 26. Wind data for that date points to 

 field blown dusts as the most probable source, as there were no 

 accountable particulate stack emissions during the testing period. 



