The LNG/Domestic gas plant operated by Woodside Offshore Petroleum at Karratha in Western Australia has a number of point emission sources to atmosphere spread over a 110 hectare onshore area. The amount of source monitoring was recently agreed with the Western Australia Environmental Protection Authority which set new emission limits for nitrogen oxides, sulphur oxides and hydrogen sulphide, as well as specifying the monitoring program to be instigated for these. Because the plant consists of a number of duplicate facilities, a monitoring program based on a limited number of representative equipment types has been developed.

This paper describes the history of emission monitoring at the site and Woodside's design of a mobile facility to measure source emissions and ambient concentrations adjacent to areas zoned as hazardous. Also discussed is the management of the atmospheric monitoring program and its rationale in a remote, arid location like north west Western Australia.

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