Environment
Produced water - quality and disposal method
Total volume of produced water declined at the Camden Gas Project, down 23% compared to FY20, due to the decommissioning of gas wells at the facility.
Project | Volume of produced water (kL) | Average EC (µS/cm) | Characterisation | Average TPH (µg/L) | Estimated TPH disposed (kg) | Disposal method |
|---|---|---|---|---|---|---|
Camden Gas Project | 1,192 | 8,587 | Slightly saline quality (4800 - 10000 µS/cm) | 50 | 0.03 | Offsite via Cleanaway |
Notes
TPH: Total petroleum hydrocarbons (Note- following NEPM 2013 update, ALS refers to TPH as TRH. TRH results have been used to calculate these values).
EC: Electrical conductivity (μs/cm).
Data relates only to the volume of water produced from coal seam gas wells. Data does not include water produced during the installation and use of groundwater monitoring bores. It is assumed that the water produced during installation and use of monitoring bores would have TPH = 0 mg/L.
Data shows a calculated mass of total petroleum hydrocarbons based on the volumes of water produced during FY21.
Water quality characteristics relate to the quality of the water as measured from the well, not at the point of disposal.
Characterisation is defined as follows:
Fresh water quality – water with a salinity <800 μS/cm.
Marginal water quality – water that is more saline than freshwater and generally water between 800 and 1,600 μS/cm.
Brackish quality – water that is more saline than freshwater and generally water between 1,600 and 4,800 μS/cm.
Slightly saline quality – water that is more saline than brackish water and generally water with a salinity between 4,800 and 10,000 μS/cm.
Moderately saline quality – water that is more saline than brackish water and generally water between 10,000 and 20,000 μS/cm.
Saline quality – water that is almost as saline as seawater and generally water with a salinity greater than 20,000 μS/cm.
Seawater quality – water that is generally around 55,000 μS/cm.