Purpose of project
Mature Eucalyptus trees are threatened by imposed level changes of half a metre. Aeration beds are installed to prevent root suffocation.
Rock filled aeration beds
Tree planting date
Eucalyptus capitellata, Corymbia gummifera, Lophostemon confertus (Brown Stringybark, Red Bloodwood, Brushbox)
Botanical name (Common name)
Number of Trees Planted
Tree Stock Size at Planting
Number of Trees Surviving
Survival Assessment Date
Owner of Site
Lake Macquarie City Council
Bernie Goodwin reserve, Morrisett, NSW
Lake Macquarie city Council
If you require details not available here, see contact details.
Case Study Description
Existing mature trees, with habitat values enhanced due to roosting and nesting Spoonbills.
Threatened by playground construction works, which identified asbestos contamination.
Required to fill entire site by 500mm to encapsulate asbestos affected soil.
Management decided to save trees rather than remove/replace.
Design &/or as constructed detail
Sandstone block lined beds, with matrix of aeration tubes covered with 500mm of 90-200mm sandstone. Surrounding areas filled with compacted soil to 500mm. Geofabric layer over native soil to encapsulate asbestos contamination, followed by aeration pipe matrix, covered with geofabric layer, covered with 500mm depth of sandstone rock.
Depth of Engineered Space
Volume of Engineered Space
subsoil perforated plastic piping
Drainage Type Resource/Image/Document
Growing Media Detail
Native soil undisturbed
Surrounding Site Soil Detail
All areas surrounding the aeration beds have been raised .5m and a playground/hard surfaces installed
Surrounding site soil detail Resource/Image/Document
Leaf blower to remove surface debris
Aeration pipes with numerous inspection points
Installation quality control
Stakeholder Support for future projects of this kind
Not yet determined. This project sourced ‘waste”sandstone for minimal cost.