The Prebbleton residents who do not want the plant in their neighbourhood gathered at the city council offices on Hereford St from 9.30am.
They were wearing the same protective suits and gas masks they sported at a protest outside the Environment Canterbury offices on Tuam St last month.
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Resident Angela Jones said they raised their concerns at the city council meeting over the planned extension of the Waste Management Ltd plant in Prebbleton.
Waste Management Ltd wants to expand its current site to operate a waste stabilisation and treatment facility at 305 Marshs Rd.
In its resource consent application, it said the plant will treat and manage items, such as pesticides, acid, used tyres and other types of rubbish.
The city council granted resource consent for the proposed plant extension in December 2018.
ECan also granted three consents for its construction and the discharge of stormwater in March 2019.
The consent application currently with ECan is only for activities resulting in discharge to air. It was subject to a limited notified consent process, meaning only people within 500m of the proposed facility get the chance to have a say on the consent.
The plan has prompted a major backlash from the nearby residents who are calling for wider consultation.
But Environment Canterbury is standing by its decision to restrict submissions and has previously said only the High Court could overturn its decision.
The residents believe it should never have to reach that stage. But it is looking increasingly likely the residents will file a judicial review with the aim of making it a fully notified consent process.
