A subsidiary of CRH is planning to deal with three separate illegal dumps on its lands in west Wicklow by creating a special landfill on the site.
Roadstone Dublin Ltd, which owns a large site near Blessington, is to apply for a special one-off licence from the Environmental Protection Agency to create the landfill.
The company last night stressed that the landfill would only be dealing with the existing waste on the site, which is estimated to exceed 50,000 tonnes.
The Roadstone dumps were among of a number of large-scale illegal dumps uncovered in Co Wicklow three years ago.
Roadstone management has maintained it was unaware of the illegal dumping activity, which is still the subject of a criminal Garda investigation.
The remediation proposals followed extensive discussions with the Environmental Protection Agency and Wicklow County Council. They are expected to take up to 18 months to implement, at a cost of at least €5 million.
Last month the council issued Roadstone with an order to clean up the site, and requiring it to apply for a licence to the EPA to carry out the work.
In a statement last night, Roadstone said that all hazardous material would be removed and brought to a licensed facility. The remaining waste would then be brought to an engineered landfill on the site.
"This waste licence will be used to deal with the unauthorised material already on site only," according to the statement.
"There is no intention to operate a commercial or public landfill site now or in the future and the remediation landfill will be permanently capped on completion of the works."
An Taisce has criticised the move, claiming it effectively means that a landfill site was chosen, based on where the as yet unidentified illegal dumpers had chosen to dump their waste.
Mr Frank Corcoran, chairman of An Taisce, who lives near Blessington, said lands including the controversial Glen Ding Wood were on an aquifer.
"It is such a sensitive site it would never be selected for a dump in normal circumstances and it would be extraordinary of the EPA were to even entertain a dump on this important drinking water source," he said.
Roadstone has claimed, however, that "comprehensive monitoring, sampling and environmental controls has shown there has been no impact on the local water supply".