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The Otago Regional Council is reviewing the information available on the Taieri's contaminated sites.
Ten sites in the Taieri area were identified by the Otago Regional Council and Dunedin City Council in 2009 as contaminated.
Last week, the ORC met representatives from Otago's territorial authorities to discuss a new hazardous activities and industries list.
ORC director of environmental monitoring and operations Jeff Donaldson said the list would contain revised information on contaminated sites and part of the process would involve re-evaluating hazardous and potentially hazardous sites in Otago.
''We are going over all of the sites in Otago and looking at them more closely because there's a number of sites which haven't been clearly identified,'' he said.
The sites in the Taieri area which had been identified as contaminated would be among those reviewed.
''We are going through those to see if we can find what sites are where and just exactly what the contamination is likely to be.''
ORC senior environmental officer Simon Beardmore said although the Taieri sites had been identified as contaminated, the risk to human health was low.
The councils hoped to standardise the information available about sites and across councils to ''improve access to information on contaminated land and potentially contaminated land, and to help the public, local authorities and others make informed decisions''.
''Any change in land use at these sites would require an evaluation of risks to human health and Dunedin City Council approval,'' he said.
Dunedin City Council resource consent manager Alan Worthington said the council did not ''actively manage'' the sites, but if someone applied for resource consent to use them, the user had to address the contamination and the impacts of their proposed use.