Arboricultural Impact Assessment report · MCU18/0165

                                                                              Consult Arborist

5 T REE AND S I TE A SSESSM ENT
Three mature (3) trees have been individually assessed to provide information and clarity
regarding their suitability for retention within the project design, taking into consideration the
construction phase and future use of the site.

Noosa Council has expressed their desire that these three trees to be retained as part of this
development within the Council Road Reserve as Council Assets.

The allocated TPZ’s are estimated and provide a good representation of the calculated
protection areas required as per AS4570-2009 Protection of trees on development sites.

The results are to be presented to Noosa Council for consideration, and upon confirmation of
support should be incorporated into the final design and documentation.



5.1     TREE 1 – OLIVINE STREET FRONTAGE

                                                        DBH      Height   Spread    TPZ     SRZ
 ID #     Botanical name               Common Name
                                                        (mm)      (m)       (m)      (m)    (m)
 T1       Eucalyptus tereticornis      Forest Red Gum    800     25-30     15-20    9.6m    3.2
*Measurements estimated by eye and experience.

The overall health and condition of the tree appear to be ‘Good' or typical for a mature tree of
this species; no major defects or disorders were noted at the time of the inspection.

The tree is located within the NC road reserve, 2.5 to 3m from the property boundary. On the
proposed design, two visitor car parking spaces in front of Unit 1 and a corner section of the
Community Garden are adjacent Tree 1 inside the site. In total this aspect of the design
intrudes by approximately 30% into the tree's calculated TPZ on the site side. This level of
intrusion is determined as Major and will require additional tree protection measures to be
implemented to reduce the impact on the tree’s health and ensure its suitability for retention.
In addition, due to the spreading form of its canopy, side branches on the development side
will intrude towards the corner of Unit 1. Selective pruning is necessary to reduce this intrusion
of branches that directly target the area of increased occupancy. It is also advised that
compensatory pruning is undertaken to balance the canopy as required; see Tree / Canopy
management.

Noosa Council has mandated the construction of a pedestrian footpath at 4m and a kerb at
8m. These works will result in up to 24% intrusion into the calculated TPZ and may also require
a rise in soil level over the entire road reserve (at this stage the depth required is unknown).
A shallow depth of topsoil will not cause the tree ill harm; however, the removal of the existing
ground vegetation will need to be considered and a method developed to minimise ground
disturbance. This level of intrusion is deemed as Major and will require detailed consideration
to ensure the impact is kept to a minimum and acceptable for the retention of the tree. It is
recommended that the footpath is constructed over the existing ground on a shallow depth of
fill to reduce excavation requirements.




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