Campaigners aiming to stop the development of a "monster" sewage treatment plant in Clonshaugh believe they are on track to reverse its planning permission.
The plant, which will be located near Dublin Airport, was granted planning permission by An Bord Pleanala in November.
Irish Water's plan to build the facility had been coined the 'Monster Plant' by locals in the area and had received 14,000 objections.
The company has said that the plan was necessary to cater for future popular growth as the Ringsend plant is currently operating at over capacity.
But opponents to the Greater Dublin Drainage project, group Solution Not Pollution, have said they do not want the sewage plant just off the Malahide Road which will be four times the size of Croke Park.
Sabrina Joyce-Kemper from Portmarnock, is one of the leaders of the Solution not Pollution campaign.
She is leading the judicial review with An Bord Pleanala and Irish Water and is hoping to see the previous planning permission revoked.
She told Dublin Live: "We've felt good about this from the very beginning because we've come prepared.
"It's been shown that the surveys by Irish Water are completely deficient, and there are experts from left, right and centre wanting to help us fight this.
"I've seen cases won on an eighth of the grounds to what we have."
The review was before the High Court yesterday, and Sabrina said the campaign is feeling more confident than ever.
The process is expected to begin on April 21, but Irish Water are understood to have asked to push it back to July.
Sabrina continued: "The judge wanted to begin this process in April. They [An Bord Pleanala and Irish Water] wanted more time and asked to begin in July.
"They [the solicitors] were completely unprepared. I could tell that the judge was really annoyed. They've been told to go back to the client to get their files in order and it will be reviewed in the coming days."
Sabrina added: "I think they're going to be forced to attend court in April. The judge is aiming for six days for this whole thing to play out, and it's clear he doesn't see it as a long and drawn out process.
"We're working on an alternative white paper that will show that capacity can be maintained with different proposals."
