THE Dublin Airport Authority has objected to the site of the proposed €500m sewage treatment plant as birds scavaging there could pose a safety threat to planes.
The choice of the controversial site sparked a wave of outrage after Fingal County Council gave the green light to the project, which had attracted more than 10,000 objections.
Objectors claimed the site for the 'monster' sewage treatment plant had the potential to cause an environmental disaster.
In its submission to the Greater Dublin Drainage project team, the DAA said the site was located just 2.6km from the existing main runway, which handles 75pc of aircraft landing at Dublin Airport and 15pc of aircraft on take off.
"The potential site is a matter of concern arising from the threat to aviation safety posed by bird hazard," their two-page submission said.
"It is within an area where the presence of any attractants for scavenging birds would be a hazard to air safety."
The site was in an area in which the DAA would have to resist the erection of any object which would constitute an obstacle to aviation, it said.
The outflow for the facility, near Dublin Airport, is planned for Portmarnock, near Ireland's Eye.
Three sites had been shortlisted for the 50-acre facility – Annsbrook and Newtowncorduff, near Lusk, both with an outfall near Loughshinny, north of Rush, and Clonshaugh.
DAA sources said their objections are likely to be expanded at any Bord Pleanala hearing into the proposed plant.
There were more than 10,000 objections from local interests, including the horticultural industry, fearing it would harm farming and agriculture and destroy the local fishing industry and coastline.
Those opposed to the €500m development claimed that a number of smaller sites would be preferable.
Project managers with Greater Dublin Drainage said the site, which is 2.2km east of Dublin Airport and between the Malahide Road and the M1, is ecologically and environmentally better.
Fingal County Council says that one large plant discharging into the Irish Sea is the most sustainable option.
The 23-hectare site is currently farmland and will require 32km of underground piping to transfer treated waste to sea.