RFI - Attachment 3 - Arborcultural Impact Assessment Report · 132003.221108.3

2 Introduction
2.1 Brief
This report has been prepared by Specialist Arbor Services Pty Ltd (SAS) on behalf of Rick Egan
Builders to present the findings of an Arboricultural Impact Assessment (AIA) in relation to the
proposed development at 27 Bayview Road, Noosa Heads and provide a Tree Management Plan
(TMP) to navigate the likely impacts.

My role as a Consulting Arborist is to gather facts by observations to assist in determining the best
Arboricultural codes of practices are applied and so that it follows the AS4373-2007 Pruning of
amenity trees & AS4970-2025 Protection of trees on development sites.

The purpose of this report is to firstly survey the trees and assess the projects impacts upon trees
that are located within the project boundaries and secondly, to advise on ways to mitigate the
impacts through recognised tree care and tree protection methods.

Detail has been requested in relation to the following instructions:
   • To assess the overall condition and retention value of the subject trees.
   • To determine the Notional Root Zones (NRZ), Tree Protection Zones (TPZ) and Structural
        Root Zones (SRZ) of the subject trees.
   • To determine whether the subject trees are expected to remain viable following the proposed
        development.
   • To propose recommendations that are expected to ensure that the subject trees would remain
        viable post construction.



2.2 Method
A ground based Visual Tree Assessment (VTA) considering Tree: identity, estimated age, tree
dimensions, tree health, structure, and notable features, will be carried out in accordance with
internationally recognised tree assessment practices including but not limited to:

   •   Field Guide for Visual Tree Assessment (Claus Mattheck & Helge Breloer (1994)
   •   Lonsdale, D. 1999. Principles of Tree Hazard Assessment and Management.
       The Stationery Office. London, UK.
   •   Mattheck, C. Bethege, K. & Weber, K. 2015. The Body Language of Trees. Karlsruhe
       Institute of Technology. Karlsruhe, GmbH.
   •   Australian Standard AS4970 – 2025 ‘Protection of Trees on Development Sites’

A calculation of the Notional Root Zone (NRZ) and Structural Root Zone (SRZ) is conducted to
assist in understanding the degree of encroachment from the proposed works. Mitigation measures
are then developed to assist in reducing unwanted impacts occurring to retained trees. The trees
retention value is then assessed based on the above information. This data can be found within the
Tree Assessment Table and Tree Management and Tree Protection Fencing Plan, in addition to this
this report.

When a tree is deemed to have an obvious tree risk feature, a detailed assessment is carried out from
the ground using the QTRA tree risk app. This method calculates the risk of harm (RoH)
quantitively by considering probability of failure and the consequence if the failure was to occur.

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

    Prepared by (Sam Carr – Specialist Arbor Services Pty Ltd)                          Page 2 of 26