Dissolved petrol removal
INSTALLATION of an air sparge and vapour extraction system on the bank of the Orara River at Coramba is due to begin this month.
The work will be carried out by specialist contractors WSP Environmental and the system will be installed at the end of Martin Street.
The system is a remediation measure to remove from the groundwater and soil dissolved petrol which has been leaking from the river bank since 2002.
Installation of the full-sized system follows an earlier pilot deemed successful by Coffs Harbour City Council, which is overseeing the project on behalf of the community, using funds provided by the NSW Environmental Trust.
The air sparge system uses compressed air to help remove hydrocarbons from soil and groundwater below the water table.
When air is pumped underground through the contaminated area, the petrol compounds will evaporate into the injected air, which makes them easier to remove.
The soil vapour extraction system is a vacuum system which captures the air containing the hydrocarbon vapours.
This air will then be passed through filters to remove any contaminants. Commissioning of the system is expected to be undertaken during May.