The discovery of BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds, in groundwater coming from the deep coal seams near Gloucester, has prompted a high level of community interest. The BTEX has been found, by the NSW Environment Protection Authority and the Division of Resources and Energy, to be naturally occurring. The water, currently being pumped from AGL’s Waukivory wells, is being transported to a licensed liquid waste treatment facility north of Brisbane.
To address interest in the presence and management of BTEX in water from our gas wells we’ve compiled a range of reports, studies and other factual information to provide the community with a better understanding of the issue and to demonstrate AGL’s commitment to managing BTEX at the highest standards.
BTEX1 has been found by the NSW Environment Protection Authority2 and the Division of Resources and Energy3 to be naturally occurring in water contained in the deep coal seams at Gloucester. AGL is removing flowback water from the coal seams via its four wells at the Waukivory Pilot, from where it is being transported to a licensed liquid waste treatment facility north of Brisbane.
This table compares the regular analyses of flowback water taken at the Aboveground Storage Tank (AST) at Waukivory against limits known as ‘trigger levels’1 that would require further evaluation and the post-treatment analyses of the water prior to its lawful discharge as authorized liquid waste by AGL’s contractor Toxfree Solutions.
All sampling is undertaken in accordance with relevant regulatory requirements in NSW and Queensland.
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1The BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) trigger levels have been developed by Environmental Risk Services Pty Ltd and endorsed by the Division of Resources and Energy.
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