Unit 2007 2008 2009 2010 2011 2012 target
Diverter stack usage hours per year 261.26 129.16 265.82 56.28 122.83 < 292
Sour gas flaring tonnes per day SO2 4.3 7.3 3.2 2.4 3.8 <5
Main stack sulphur dioxide hours greater than 16.4 tonnes per hour 3 3 0 2 0 0
Main stack sulphur dioxide 90-day rolling average >245 tonnes 0 0 0 0 0 0
Main stack nitrogen oxides # of hours >1.5 tonnes per hour 0 0 0 0 0 0
Main stack opacity # hours > 40% 27 84 22 5 9 < 5
Ambient air exceedances H2S hourly # 17 55 5 0 14 0
Ambient air exceedances H2S 24-hour period # 3 9 1 0 4 0
Ambient air exceedances SO2 hourly # 2 1 0 0 0 0
Ambient air exceedances SO2 24-hour period # 0 0 0 0 0 0
Odour incidents # attributed to SCL 10 3 1 0 2 0

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