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Environment

Produced water - quality and disposal method

The volume of produced water at the Camden Gas Project has increased by 11% compared to FY19.

Project

Volume of produced water (kL)

Average EC (µS/cm)

Characterisation

Average TPH (µg/L)

Estimated TPH disposed (kg)

Disposal method

Camden Gas Project

1543

9750

Slightly Saline Quality (4800 - 10000 µS/cm)

50

0.039

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 FY20.

  • 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.

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