Our client is embarking on a world-scale long-term Coal Seam Gas (CSG) to LNG project. As part of this project, our client is expanding its operations within the upstream gas field area. Existing operations in the upstream project area include four compressor stations and the expansion includes constructing another two compressor stations.
The existing Environmental Authority (EA) sets out a detailed stack air monitoring program for the six compressor station sites, covering the major emission points (compressor engines and generators) as well as a number of smaller emission sources (TEG Reflux Columns and Reboiler Burners). In addition, the EA requires that a modelling validation study be performed for the compressor stations based on the results of the stack monitoring.
SLR’s objectives were to model air emissions from the 6 Compressor Stations, 2 permanent accommodation camps and a number of water treatment facilities in order to provide supporting evidence for an application to amend the existing Environmental Authority. We also provided expert advice with preparing the submission and assisting in discussions with Department of Environment and Heritage Protection
SLR undertook the following works:
- Assessment of Background Air Quality and Emission Inventory: Identification of existing infrastructure and land uses within and surrounding the upstream gas field area which are likely to influence existing air quality. Stack and emission data required for modelling was compiled for the emission sources associated with the existing and proposed compressor stations
- Meteorological Modelling: SLR developed a meteorological model for the upstream gas field area.
- Air Dispersion Modelling Study: The modelling of NOX, CO and VOC emissions from the compressor stations included a range of likely scenarios representative of future operational conditions.
- Assessment of Impacts: The modelling results were assessed against relevant project criteria set out in EA, and ambient air quality standards within the National Environmental Protection Measure (NEPM) Air and the QLD EPP (Air).
- Reporting: A report was developed outlining our findings in order to support an amendment to the EA for air monitoring requirements.