The opposition will push for broader scrutiny of the ACT's management of environmental reporting in the wake of the pollution of Hume groundwater with potentially dangerous chemicals.
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The Canberra Liberals are expected to move a motion on Wednesday calling for the Auditor-General's involvement in the case. This is likely to spark debate over the state of environmental protection in the territory.
The groundwater beneath the Koppers site was polluted with up to 2430 times the safe limit of hexavalent chromium by 2007.
The US-based corporation used a mixture of copper, chrome, and arsenic to treat Koppers logs at the plant between the 1980s and 2005.
But public records show it failed to send frequent groundwater tests to the ACT government, something that was picked up on by the Environment Protection Authority the year Koppers stopped production.
Just two groundwater test results were received in the three years between mid-2002 and mid-2005, despite Koppers being legally required to send them quarterly.
Six lab reports were submitted in the four years between 1998 and 2002, when the corporation was asked to send them every four months.
The EPA never disciplined Koppers, nor sought to prosecute it for leaching the carcinogenic chemical into groundwater at levels well above the legal limits in its Crown lease and 2002 environmental authorisation.
The ACT government last week released the results of urgent testing at the site, which confirmed the chromium 6 had not spread from beneath the former Koppers plant.
Opposition environment spokeswoman Nicole Lawder will move a motion in the Assembly on Wednesday to call for the Auditor-General to conduct a performance audit of the management of environmental reporting in the ACT.
Mrs Lawder will move that the broader audit be conducted with reference to the Koppers case.
The motion will also urge the government to provide information within a month to update the public on remediation of the groundwater and on the steps take to ensure the situation is not repeated.
Mrs Lawder said it was important the government learnt from rare cases such as Koppers and the 2011 toxic fire in Mitchell.
''It mightn't happen very often but you need to learn lessons from when it does happen to make sure you deal with it better, or even better still, you pre-empt it and make sure it doesn't happen at all,'' she said.
Greens MLA Shane Rattenbury has previously voiced support for any audit by the Auditor-General, although his position on the Liberals' motion was unclear on Tuesday night.
The ACT government has assured the public there is no risk to human health or the environment from the contamination.
The chemical is safe if it is contained and does not spread into nearby waterways, or come into contact with humans or plants or animals in other ways.
But Mrs Lawder said she was hearing differing reports about how easily the contaminated groundwater can spread.
''We're unable to get a realistic, convincing guarantee that groundwater and the water in the perched aquifer cannot spread,'' she said.
''I've had conflicting reports, with some people suggesting to me that it certainly could spread into surface water if not in the next couple of years, in 50 or 100 years time.''
She said the public deserved to be comforted by a serious approach being taken to the issue.
''There does appear to have been some systemic failures, there were missing reports … and that should have been the very first time the government or the EPA stepped in to make sure everything was occurring that should be occurring.''