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Environment

Produced water - quality and disposal method (FY19)

The volume of produced water at the Camden Gas Project has remained relatively similar to FY18. The Gloucester Gas Project has been decommissioned and rehabilitated.

Project

Volume of produced water (kL)

Average EC (µS/cm)

Characterisation

Average TPH (µg/L)

Estimated TPH disposed (kg)

Disposal method

Camden Gas Project

1,391

9750

Slightly Saline Quality

<50

0.03

Offsite via Cleanaway

Gloucester Gas Project

NA

NA

NA

NA

NA

NA

Notes

  • NA: Not applicable. In February 2016, AGL announced it would not proceed with the Gloucester Gas Project. Since then, AGL has completed an extensive decommissioning and rehabilitation program for its well sites and other infrastructure.

  • 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 (us/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 FY17.

  • 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 waters between 800 and 1,600 μS/cm.

  • Brackish quality – water that is more saline than freshwater and generally waters between 1,600 and 4,800 μS/cm.

  • Slightly saline quality – water that is more saline than brackish water and generally waters with a salinity between 4,800 and 10,000 μS/cm.

  • Moderately saline quality – water that is more saline than brackish water and generally waters between 10,000 and 20,000 μS/cm.

  • Saline quality – water that is almost as saline as seawater and generally waters with a salinity greater than 20,000 μS/cm.

  • Seawater quality – water that is generally around 55,000 μS/cm.

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