FINAL_Arborist Report_22 Nylana Way, Doonan_Chris Townsend

3. Inspection Results:
On the day of inspection, the site had recently been cut and filled in order to commence
construction works. The cut is on the south and east sides with the fill being to the north and west
sides to gain a level pad. Remaining trees surrounding the site appear to be showing good vigour
at the time of inspection. Some deadwood is present, this is typical of species and maturity.
A Tallowwood (tree 1) and Turpentine (tree 2) at the eastern boundary have sustained significant
damage to the root zone as the site cut is all the way to the base of the trees. A larger Tallowwood
to the north of these has also has an incursion into the TPZ (Tree Protection Zone) in the site
preparation process.
Multiple larger species include a Flooded Gum, several Tallowwood, a Red Stringybark, and a
Turpentine. These are located to the east and southern sides of the house site. Their canopies
encroach towards the proposed construction. The aforementioned Flooded Gum at the
northeastern corner of the site has already had recent encroachment pruning. A Turpentine is
located at the western side of the house site. This tree doesn’t encroach on the property; however,
it is bifurcated with a co dominant leader starting mid-way on the trunk. Approximately 40% of the
eastern side of the root zone is covered with fill from the site cut.
Trees inspected are only those as directed by Chris Townsend.

4. Conclusion:
In conclusion to the inspection results, the Tallowwood (tree 1) and Turpentine (tree 2) at the
eastern boundary have up to 50% incursion to the TPZ. As per AS 4970-2009 Protection of Trees
on Development Sites, it states that an incursion of any more than 10% is considered a ‘major
encroachment’ and certain conditions should apply. These 2 particular trees have sustained
damage too great to be able to retain them. I recommend removal of the trees to low stumps and
any herbicide application to be avoided to prevent possible translocation to the surrounding trees
of the same species. If the stumps are to be removed, I suggest stump grinding opposed to
excavation in order to prevent further damage to surrounding trees.
Regarding the multiple larger species located around the site. This encroachment/deadwood
pruning will be classed as maintenance work. Prune according to AS 4373 Pruning of amenity
trees. Work should be performed by a minimum Cert 3 qualified arborist. The Turpentine at the
western side of the house site has fill over approximately 40% of the root zone. This may limit
water and oxygen uptake to this part of the root zone resulting in declining health of this tree.
Follow up consultations by a diploma qualified arborist should be scheduled at 6-month intervals
to check on the health and vigour of the retained trees.
Any trees with excavation within the root zones require canopy reduction pruning to minimise
destabilization caused by work conducted within the TPZ. The general increase of exposure to
the elements due to the clearing work are also a contributing factor to this potential destabilisation.




Arborist Brief– TSA: 22 Nylana Way, Doonan
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