RFI - Attachment 3 - Arborcultural Impact Assessment Report · 132003.221108.3

- The fence should be clearly signed ‘Tree Protection Zone – No Access’.

Tree Root Pruning
Any root pruning required should be completed with a sharp hand tool. The cuts should be made at
a right angle to the root so as to reduce wound size. No wound dressing is needed. No roots larger
than 30mm in diameter should be cut without prior consent from the PA.

Working in the calculated TPZ/ NRZ of the subject trees
Non-Destructive Excavation (NDE) appears it will not be adequate to conduct the ground work
required to facilitate the proposals. The PA is to be present during the demolition/excavation work
to provide guidance on root management and root pruning, if necessary.

Project Arborist Certification
The PA is to assess the trees once the development has been completed. The purpose of this
assessment will be to ensure the tree has not been negatively impacted or damaged throughout the
development. Health remediation may be recommended at this point in time if the tree shows any
signs of decline or damage.


3.3.2 Considerations
Under AS4970-2025 the TPZ is described as:
The Tree Protection Zone (TPZ) is defined in Clause 1.3.19 of AS 4970:2025 as:
"specified zone above and below ground and at given offsets from the trunk set aside to protect a
tree’s roots and crown where these might be damaged by development."
    • The NRZ is the starting point for determining the TPZ.
The TPZ should be determined using various considerations in relation to the tree and proposed
encroachments. Additionally:

The Structural Root Zone (SRZ) is described as:
The Structural Root Zone (SRZ) is defined in Clause 1.3.17 of AS 4970:2025 as:
“Theoretical area around the base of a tree required for the tree’s stability in the ground.”
The woody root growth and soil cohesion in this area are necessary to hold the tree upright. The
SRZ is nominally circular with the trunk at its centre and is expressed by its radius in metres. This
zone considers a tree's structural stability only, not the root zone required for a tree's vigour and
long-term viability, which will usually be a much larger area and is referred to as the ‘(NRZ/TPZ)’.




    Tree Report: (AIA-27 Bayview NH-120226)                          Report Number:     (001)

    Prepared by (Sam Carr – Specialist Arbor Services Pty Ltd)                        Page 8 of 26