26_04_27_AIA_JLTP_12-14 Gympie St

Page 2

This document was prepared for the sole use of Jack Lewis Town Planner, on behalf of the client and
any regulatory agencies involved in this project. No other party should rely on this information without
the prior written consent of Consult Arborist and the client.

The findings laid out in this report are valid for 12 months from the date of the assessment.

If the advice and recommendations made in this report are not strictly adhered to, no responsibility will
be taken for the continuing health and condition of retained trees. Trees are dynamic living organisms
that respond to changes in their environs; repeat assessments are key to maintaining tree vitality,
structural integrity and reducing any potential risk they may pose.


C OPYRIGHT N OTICE
This document remains the property of Consult Arborist Pty Ltd under the Copyright Act 1968
(Australia). Unauthorised reproduction, distribution, or modification is strictly prohibited. No part of this
document may be copied, reproduced, or used without prior written permission. No responsibility will
be accepted by Consult Arborist Pty Ltd for unauthorised or partial use of this report.

General Permission of use subject to Consult Arborist Pty Ltd copyrights:
•    Hard copy permission: Entire copies may be printed for Client use for internal or Project liaison.
•    Electronic permissions: Must be original PDF format for filing and/or limited to the agreed parties
     with a direct and vested interest in the case.



D OCUMENT C ONTROL
The latest approved version of this 26_04_27_AIA_JLTP_12-14 Gympie St should be available to all
personnel involved in the Project in consultation with Consult Arborist Pty Ltd.

Each new revision should be distributed to all key personnel for review and endorsement.

 Version               Date                       Written           Reviewed         Approved
 One (1)               27/04/2026                 MJD               SD               MJD




D OCUMENTS R EVIEWED
The following documents have been reviewed, analysed, and referenced during the production of this
report.

 Reference / Date      Title / Details
 22.04.2026            Project Urban - 25430_OPW [D] new (Landscape Plan)
 17.02.2026 (B)        Recor - P0352-25-003-02-GYMPIE-ST-TEWANTIN




26_04_27_AIA_JLTP_12-14 Gympie St                                                               Page 2 of 17

Page 3

T ABLE OF C ONTENTS
Copyright Notice ................................................................................................................... 2

Document Control ................................................................................................................. 2

Documents Reviewed ........................................................................................................... 2

1     Introduction & Brief ........................................................................................................ 4

2     Site Inspection ............................................................................................................... 5

3     Scope & Limitations ....................................................................................................... 5

4     Site Maps / Plot Plan ...................................................................................................... 6

5     Findings and Discussions .............................................................................................. 7

    5.1       Summary Tree Table ............................................................................................. 8
    5.2       Tree Review .......................................................................................................... 8
    5.3       Design Review....................................................................................................... 9
6     Tree Protection During Works ...................................................................................... 10

    6.1       Site Preparation ................................................................................................... 12
    6.2       During Works ....................................................................................................... 12
    6.3       Supervised Trenching & Bridge ........................................................................... 13
7     Summary Tree Protection Procedures ......................................................................... 14

8     References: ................................................................................................................. 15

9     Disclaimer and Limitations of Liability ........................................................................... 15

Appendix 1: Definition of Terms .......................................................................................... 16

Appendix 2: TPF Sign ......................................................................................................... 17




26_04_27_AIA_JLTP_12-14 Gympie St                                                                                       Page 3 of 17

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1     I NTRODUCTION & B RIEF
The site at 12–14 Gympie Street is located within the Noosa Council residential suburb of
Tewantin.

Stacey Clohesy, Senior Environment Officer, Development and Regulation, Noosa Council,
requested an Arborist Report on specific council trees via an email dated 31 March 2026.

The report aims to address tree protection concerns relating to the proposed project design.

Jack Lewis Town Planner, commissioned this Arborist Report in response to the Noosa
Council email request for information relating to the protection of three (3) existing street trees
at the frontage of the site

This report reflects the current project design and aims to respond to the council’s request.

This Arborist Report will:
• Provide information on the existing subject trees
• Review the project’s design in relation to the trees.
• Discuss mitigation measures to retain subject trees.
• Provide Tree Protection Specifications for retained trees.


Project Urban landscape design plans are used and referenced in the report to demonstrate
the subject trees' locations within the verge in relation to the development.

Tree retention and/or removal, and the Tree Protection Specifications and plan are developed
guided by the concepts in the AS 4970:2025 Protection of trees on development sites.

Please note: the Tree Protection Zone (TPZ) does not always reflect a tree’s calculated Notional Root
Zone (NRZ). The TPZ is an area allocated to a tree to create an Exclusion Zone. This area is guided
by many factors, including but not limited to the tree’s NRZ calculation. Tree species, age, vigour,
tolerances, ground condition, past ground disturbances, ground/root obstructions and the requirement
to complete a project and retain a tree with a non-conforming TPZ that is justified.




26_04_27_AIA_JLTP_12-14 Gympie St                                                        Page 4 of 17

Page 5

2     S ITE I NSPECTION
Consult Arborist, led by Director and Principal Arborist Matthew Duncan, is a trusted authority
in arboricultural consulting.

With over 30 years of industry experience, Matthew holds an AQF Level 5 Diploma of
Arboriculture (AHC50510) and an ISA Tree Risk Assessment Qualification (valid 2015–2030)
and undertook the Visual Tree Assessment on the site from a ground level in April 2026 to
review subject trees and project design.

Since founding Consult Arborist in 2011, he has provided expert arboricultural guidance for
private, civil, and capital works projects across Queensland.

As a Qualified Member and Approved Consultant of the Queensland Arboricultural Association
(QAA), Matthew ensures professional, informed, and tailored solutions for clients seeking
high-quality tree assessment and management services.

3     S COPE & L IMITATIONS
The purpose of this report is to provide advice and guidance for the subject trees at the project
site.

Consult Arborist has reviewed the supplied documentation relating to the site, the existing
trees/vegetation, and the site layout with consideration to the design, future use, and
buildability of the project. This report aims to provide guidance and direction on the practical
consideration of the required retention of the trees.

Where appropriate, guidance is offered for proposed tree protection measures that can be
implemented to support the long-term viability of the retained protected vegetation.

No trunk decay detection equipment or ground radar was used as part of this Arboricultural
Assessment; no conclusive comments on what may have been or may be happening within
the internal structure of the tree or the tree’s roots will be made. No tissue or soil samples
have been collected or submitted for testing.

The information contained in this report is the author’s opinion and is a ‘snapshot in time’ of
each specific tree’s health and structure at the time of the inspection, and no guarantee can
be given that faults or issues may not arise in the future. The information is directed by the
documents provided and listed in Documents Reviewed. The information provided is taken to
be true and accurate and will be discussed as such.

This report does not take into consideration changes to the site design or activities for which
Consult Arborist has not been requested to comment on or been advised.

See attached photographs, plan extracts, and maps for identification purposes. Photographs
of the subject trees have been taken on an iPhone/iPad when required, and the light/exposure
has been adapted to improve the clarity of the picture quality.




26_04_27_AIA_JLTP_12-14 Gympie St                                                     Page 5 of 17

Page 6

4      S ITE M APS / P LOT P LAN




             Figure 1: Site location, the orange circle highlights the focused area of this assessment




    Figure 2: Project Urban Landscape design plans illustrating the subject tree locations with an orange circle




26_04_27_AIA_JLTP_12-14 Gympie St                                                                        Page 6 of 17

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5     F INDINGS AND D ISCUSSIONS
The project proposes to subdivide an existing property into seven (7) Lots with access to
Gympie Street via individual driveways and Butler Street via a shared driveway arrangement.

No trees within the site are shown for retention, and as such, no further comments will be
made on these trees.

A line of mixed tree and shrub species occupies and straddles the property boundary with
Gympie Street. Of these trees and shrubs, all bar one (Tr1) are planned for removal; as such,
no further comments will be made.

Tr2 and Tr3 are the two trees standing within the grass area of the Gympie Street verge
towards the kerb to which this report refers.




                                 Figure 3: Road reserve with Tr1 & Tr2




                    Figure 4: Trees Tr2 and Tr3 with front boundary vegetation behind




26_04_27_AIA_JLTP_12-14 Gympie St                                                       Page 7 of 17

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5.1 SUMMARY TREE TABLE
                                                                 DSH         NRZ        SRZ
  ID       Common Name          Age Class     Height (m)
                                                                (mm)         (m)        (m)
  Tr1    Pink Bloodwood         Maturing        12-14         400-500         5.4       2.47
  Tr2    Pink Bloodwood         Mature          14-16         600-700         7.8       2.85
  Tr3    Stringy Bark Euc.      Mature          16-18         700-800          9         3.1

Please note that the height and trunk diameters (DSH – Diameter at Standard Height) are
estimated by eye, to guide the calculation for the Structural Root Zone (SRZ) and Notional
Root Zone (NRZ). As these trees were retained within a suburban public road setting, they
have a formed and restrictive kerb and road on one side of Trees Tr2 and TR3; they have had
SRZ intrusion in the past decades. The trees have adapted to the verge configuration and
survived the transition from native bush trees to a suburban streetscape.

5.2 TREE REVIEW
The suburb of Tewantin has seen significant expansion over the past 60-70 years. It’s
estimated that this section of Gympie Street was developed approximately 40 years ago, when
a number of mature Eucalypt trees in the road verges were retained, including trees Tr2 and
Tr3. They were likely retained to maintain the leafy-green feel to the new suburban
development at the time. Tr1 appears to be a younger tree and was more likely allowed to
grow up in the verge next to the boundary vegetation over the past 20–30 years.

The project intends to similarly retain these trees whilst adhering to mandatory planning
conditions. The relevant Noosa council planning conditions relate to standardised driveway
designs and construction methodologies. Energex requirements specify underground
electrical conduit be installed in a trench on a set alignment of 0-900mm from the property
boundary with a 600mm+ cover. These regulatory design factors both intrude into the trees’
theoretical root zone calculations as per AS 4970:2025 Protection of trees on development
sites, requiring further review and discussion.

With all three trees growing in maintained turf with no mulch and minimal topsoil depth, it is
unsurprising that both Tr1 and Tr2 are displaying reduced vigour and depleted canopy density.
Tr3, located adjacent to the existing informal driveway access, is in better health, with average
vigour and good canopy density.




26_04_27_AIA_JLTP_12-14 Gympie St                                                     Page 8 of 17

Page 9

5.3 DESIGN REVIEW
The project proposed to construct a driveway for each Lot that fronts Gympie Street. The
alignment of each of these driveways has been reviewed, discussed, and adjusted to reduce
the surface treatment intrusion into each of the three (3) retained trees. The driveways do
cross over the surface of the trees’ NRZ calculation, and it is proposed that the construction
excavation of the driveway is kept to a minimum whilst achieving council standard designs.

The project is required to install an underground electrical conduit on the Energex standard
alignment of 0-900mm from the property boundary. In an attempt to minimise the root damage
that will occur, these works will be undertaken adjacent to the trees using a Hydro-Vac
Excavator in the presence of a Project Arborist to guide the work. Where possible, larger tree
roots that cross the upper level of the trench will be identified for retention; within the lower
conduit alignment, the roots will be cut. Ultimately, the trench may need to be certified for
compliance by others to ensure it meets Energex standards. Trees Tr1 and Tr3 will incur the
greater intrusion from these works.

It is acknowledged that the extent of each tree’s calculated NRZ cannot be achieved, but the
combined m² area available on the Gympie Street verge represents a significant area of
protection for the trees.




                           Figure 5: Tr3 adjacent to exist informal driveway




26_04_27_AIA_JLTP_12-14 Gympie St                                                     Page 9 of 17

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6     T REE P ROTECTION D URING W ORKS
Prior to works commencing, it is proposed that a prestart meeting be held with the Contractors
and the Project Arborist to ensure an understanding of the tree protection measures required.

With the trees located on the council verge and not directly affected by the main site works,
the verge is to be a No Go Zone for general site activities. The Site Access route is to be
established along the eastern boundary as per the project plans; this will divert site traffic away
from the area next to Tr3 that is currently the informal property access.

To demarcate the No Go / Exclusion / Tree Protection Zone, site flagging or mesh fencing can
be used. Public access needs to be considered for the council verge. Figure 7 below illustrates
with a broken purple line the area to be fenced to demarcate the tree protection zone. Site
steel mesh fencing can be erected along the boundary with the site, and flagging can be used
during the working day to visually mark the edge of the Site Access Route.

NO site traffic or materials are to be parked or stored on the council verge.

It is acknowledged that the extent of each tree’s calculated NRZ cannot be achieved, but the
combined m² area available on the Gympie Street verge represents a significant area of
protection for the trees.

The electrical trenching works required are to be undertaken with a combination of a suitably
sized excavator and Hydro Vac. The trench will be approximately 900mm deep and 300mm
wide. Energex specifications will guide the trench dimensions and methodology. Where
possible, ‘Bridges’ will be retained with roots and soil in the upper level of the trench.

The driveways would ideally be constructed with minimal excavation to limit the surface root
zone intrusion. The final design will be guided by the project engineer and council conditions.
Sunshine Coast Council's footpath design at Figure 6 is offered as a guide for the intended
driveway design to limit the excavation works.




    Figure 6: Example of an alternative pathway design from Sunshine Coast Council Open Space LIM 2023




26_04_27_AIA_JLTP_12-14 Gympie St                                                            Page 10 of 17

Page 11

The Project Arborist is to be kept informed of the project designs and requirements, and is to
supervise on-site during the excavation works within the verge area.

Tree Protection Specifications are to be adhered to even in the absence of the Project Arborist.




                          Figure 7: Gympie Street Verge Tree Protection Plan
                                 Blue Circles depicting calculated NRZ
                                 Broken Purple Line = Exclusion / TPZ




26_04_27_AIA_JLTP_12-14 Gympie St                                                   Page 11 of 17

Page 12

6.1 SITE PREPARATION
Clear site – Retained trees are to be clearly identified.

Trees and vegetation deemed for removal are to be fully cleared from adjacent retained trees.
Project Arborist to undertake pre-start meeting with the clearing contractor.

Exclusion/Site Fencing – Exclusion fencing is to be erected on the periphery of the site and
the edge of the required works area to demarcate No-Go zones.

Site Access – Site access route to be established and clearly demarcated to avoid the eastern
edge of Tr3 TPZ.

6.2 DURING WORKS
Excavation works beneath the trees are to be supervised by the Project Arborist.

General excavation methodologies are to be adhered to, specifically in reference to the root
pruning and excavating perpendicular to the tree.

If any roots are uncovered during these works, the supervising Project Arborist should assess
them for pruning if safe to do so.




26_04_27_AIA_JLTP_12-14 Gympie St                                                  Page 12 of 17

Page 13

6.3 SUPERVISED TRENCHING & BRIDGE
When Supervised Open Trenching (with a Project Arborist present) is being undertaken within
a treed area, all necessary precautions are to be adhered to. The Project Arborist will be on
site and advise on the progression of the trench and undertake root pruning as required.

An Exclusion Zone / No-Go Zone around the tree is to be established with no spoil, materials,
or machinery to be stored inside this zone. Care is to be taken when excavating adjacent to
the tree, and retained tree roots are to be treated similarly to live services (e.g. water main,
electrical conduit, etc)

This technique can be implemented when installing pipes or services within a trench adjacent
to trees with spreading root systems. When larger roots are expected to be uncovered in the
upper section of the trench, these, where suitable, will be retained and left to span the trench
within a ‘Bridge’ of soil and turf.

The trench alignment will be dug up to a predetermined distance from the subject tree,
depending on its size, location, and species. At this point, the rate of trenching will slow to
allow for more detailed assessment by the Project Arborist and may include a short distance
of hand digging or vacuum excavation to determine the presence of roots. Roots uncovered
will be assessed, retained, or pruned depending on size and location within the trench. Where
roots are being retained within the ‘bridge’, the digging is to continue cautiously beneath the
root to create the tunnel for the pipe. The new pipe can then be installed within the tunnel
beneath the ‘Bridge’.




        Figure 8: Bridge with pipe laid beneath       Figure 9: Bridge of roots with pipe beneath




26_04_27_AIA_JLTP_12-14 Gympie St                                                        Page 13 of 17

Page 14

7     S UMMARY T REE P ROTECTION P ROCEDURES
To guide future design changes where works are required adjacent to the tree, the following
Summary Tree Protection Procedures are offered. These are guided by AS 4970:2025
Protection of trees on development sites, and a full Tree Protection Management Plan can be
produced if required. Definitions from AS4970 are available in Appendix 1.

Trees should be protected from damage with temporary fencing as guided by AS 4970 and
any Arborist report. Temporary fencing should be erected at the boundary of the TPZ or
Exclusion Zone marked areas as appropriate and should be installed before works commence,
including demolition.

All works within a designated TPZ of retained vegetation must be supervised by the Project
Arborist (AQF Level 5).

Take all necessary precautions, including but not limited to the following:

•   Appropriate signage, i.e., ‘Tree Protection Zone’ and ‘No Go Zone’, must be erected at
    the boundary of the TPZ to prevent vehicles from entering and prevent stockpiling from
    occurring near retained trees/vegetation.
•   No damage to be caused to tree trunks and bark (i.e., do not attach guides or stays to
    trees/vegetation).
•   If useful, exploratory root investigations can be undertaken with a hydro-vac excavator or
    as specified and supervised by the Project Arborist.
•   No excavation works/open trenching to encroach within the TPZ of retained trees unless
    under the direct supervision of the Project Arborist.
•   Approved excavation works should be undertaken with the machines sat on protected or
    solid ground away from the tree, and work performed perpendicular to the tree.
•   Where necessary to cut roots, this shall be undertaken by the Project Arborist.
•   No storage or otherwise placing of spoil, bulk or potentially harmful materials (i.e.,
    construction refuse, concrete waste, herbicides, diesel, etc.) under or within 1m of TPZs.
•   Avoid ground compaction under trees. If compaction occurs (i.e., from site access or the
    location of a construction plant or vehicle parking), notify the Project Arborist and obtain
    their instructions.
•   Ground Protection: Where construction encroaches into the TPZ of trees to be retained,
    it shall be necessary to install protection to avoid compaction of the ground surface, lateral
    and absorbing roots.
•   Any damage to trees during work is to be rectified according to AS 4373/96 Pruning of
    Amenity Trees and best horticultural practices. The Project Arborist is to guide the works.
•   Where deemed beneficial, mulch the entire ground surface within the TPZ with Forest
    Blend Organic Mulch or site mulch to a depth of 100mm.




26_04_27_AIA_JLTP_12-14 Gympie St                                                    Page 14 of 17

Page 15

8       R EFERENCES :
•     Australian Standards AS 4970:2025 Protection of trees on development sites.
•     Australian Standards AS 4373 – 2007 Pruning of amenity trees. (2007).
•     Barton, A. (2003). Wild plants of greater Brisbane. South Brisbane, Qld, Australia: Published by the Queensland Museum,
      in partnership with the Environment and Parks Branch of the Brisbane City Council.
•     Dunster, J., Smiley, E., Matheny, N. and Lilly, S. (n.d.). Tree risk assessment manual.
•     Haslam, S. and Hauser, J. (2011). Noosa's native plants. Tewantin (Qld.): Noosa Integrated Catchment Assoc. Inc.
•     Hayes, E. (2001). Evaluating tree defects. [S.l.]: Safetrees.
•     Lonsdale, D. (1999). Principles of tree hazard assessment and management. London: Forestry Commission.
•     Mattheck, C., Breloer, H., Lonsdale, D. and Strouts, R. (2003). The body language of trees. London: The Stationery Office.
•     Strouts, R. and Winter, T. (1998). Diagnosis of ill-health in trees. Colegate, Norwich: Crown.


9        D ISCLAIMER AND L IMITATIONS OF L IABILITY
The information contained in this report has been prepared independently, free of any bias and represents the honest opinion of
the consulting arborist.

All data is based on visual inspection of the tree(s) and their location at the time of writing unless otherwise stated. The report
includes opinions, advice, and recommendations based on information gathered during site inspections conducted by the author
and data supplied by the Client (Jack Lewis).

All information received from the Client shall be deemed to be true, accurate and up to date.

To the extent permitted by law, you agree Consult Arborist Pty Ltd is not liable to you or any person or entity for any loss of or
damage (including loss or damage resulting from negligence), either directly or indirectly, arising from your use of the information
presented in this report. In no event will the author be liable for any lost revenue or profits, or for any special, indirect,
consequential, or incidental damages (however caused and regardless of the theory of liability) arising out of or related to your
use of this information, even if the author has been advised of the possibility of such a loss or damage.

Consult Arborist Pty Ltd cannot be held responsible for the effects of non-conforming works carried out by inadequately qualified
staff or without the supervision of Consult Arborist.

Unless otherwise stated, this report may not be used in a court of law or any legal proceeding without the prior consent of Consult
Arborist Pty Ltd. The author is not required to provide testimony or attend court based on this report unless subsequent contractual
arrangements have been made.

The information contained in this report pertains solely to the tree(s) that were inspected in April 2026 and reflects their condition
at the time of the inspection.

No warranty or guarantee, expressed or implied, is made that the problems or deficiencies identified in the plants or property will
not arise in the future. Likewise, remedial treatments cannot be guaranteed.

Arborists cannot detect every condition that could potentially lead to the structural failure of a tree. Trees are living organisms
that fail in ways not fully understood, and conditions can often remain hidden within a tree or below ground. Consult Arborist Pty
Ltd, and the author cannot guarantee that a tree will be healthy or safe under all circumstances or for a specified period.

This report does not account for the possibility of extreme weather events or other factors beyond the control of Consult Arborist
Pty Ltd.

Treatment, pruning, and removal of trees may involve considerations beyond the scope of the arborist’s services, such as property
boundaries, ownership issues, disputes between neighbours, sightlines, landlord-tenant matters and similar concerns. Consult
Arborist Pty Ltd cannot address such issues unless complete and accurate information is provided. Furthermore, Consult Arborist
Pty Ltd cannot be held responsible for the authorisation or non-authorisation of any recommended treatment or remedial measure.

Arborists are specialists who use their education, knowledge, training, and experience to examine trees, recommend measures
to enhance the beauty and health of trees and attempt to reduce the risk of living near trees. While trees can be managed, they
cannot be controlled. To live or work near a tree involves inherent risks, and the only way to eliminate all risks associated with a
tree is to remove it entirely.

Clients may choose to accept or disregard the recommendations of Consult Arborist Pty Ltd or to seek additional advice.




26_04_27_AIA_JLTP_12-14 Gympie St                                                                                    Page 15 of 17

Page 16

A PPENDIX 1: D EFINITION OF T ERMS
 Age Class (AC): Is based on tree size and general visual characteristics of growth
 Y        Young:
          Early stage of growth, immature size and characteristics.
 EM       Early Mature:
          A fast-growing, well-established tree which has not yet reached its mature size.
          Strong upright growth habit with a dominant apical leader.
          Increased internode spaces between leaves and twigs.
          Slender lower trunk.
 M        Mature:
          The tree reached its mature size for the species and location.
          Exhibiting slowing growth rates with reduced internode spaces between leaves and twigs.
          Reduced apical dominancy with a more divisional growth habit.
          Minor naturally forming dead or dysfunctional wood.
          An increasing trunk girth to height ratio.
          Minor hollows.
 AA       Advanced Age:
          The tree has reached a mature size and is unlikely to increase noticeably in height or mass.
          The vigour/growth rate has reduced to the point that extension growth is very limited, if achieved.
          Canopy density is lessening and/or with some visible dieback/early retrenchment.
          Retrenchment of the upper crown, with increased vegetative vitality in the lower crown, creates a more compact
          form.
          The tree is displaying aged characteristics, including trunk swelling, enlarged buttress flare, trunk growth ridges,
          enlarged burrs, hollows, etc.
          Fungal activity and wood decay, and increased colonisation by flora and fauna.
 V:       Veteran:
          A tree with advanced retrenchment, reduced crown size and annual increment growth, extensive hollowing, crown
          collapse, low vigour, advanced heartwood decay, and advanced colonisation by fauna and flora.
          The former canopy is replaced with secondary adventitious growth.
          Sections of branches on the trunk are dead or dysfunctional – potential stag.
 Health (H): Is based on the tree’s general appearance and vigour, weighed against its genetic potential
 G        Good:
          Full canopy with foliage having good colour, size, and density of leaves.
          Strong vigour with a high canopy ratio, typically found in trees up to a mature age class.
          Minimal pathogen damage.
 F        Fair:
          The majority of the canopy has foliage with average colour, size, and density of leaves; discolouration may be
          present, typical for the species in the location.
          Slowed vigour and average canopy ratio; typically found in Mature and Advanced-Age classes or on younger trees
          under stress.
          Some minor twig or small-diameter deadwood, the canopy may be unbalanced.
          Minor pathogen damage.
          General health could be restored to Good with mitigation measures.
 P        Poor:
          A tree with a depleted canopy and limited to no vigour
          The canopy has notable dieback and a low canopy ratio.
          Detrimental pathogen damage.
          The tree may be in irreversible decline.
 D        Dead
          Dead and/or dysfunctional tree with minimal canopy ratio.
          Branches predominantly have no life.
 Structure (St): Is based on a visual assessment of the tree’s general form and visible defects
 G        Good:
          Structurally sound with no major visual defects.
          Trunk and buttress with no major wounds or decay.
          Canopy with sound stem and branch unions.
          The root system appears undamaged.
          No tree part failure is predicted
 F        Fair:
          A tree with minor defects or disorders which are notable in the canopy.
          Small areas of bark are missing, and small cavities are on stems and the main trunk.
          Canopy with asymmetrical growth resulting in an uneven canopy form.
          Tall phototropic growth habits.
          Minor damage due to root zone intrusion.
          Limited tree part failure is predicted.
 P        Poor:
          A tree with visual defects and disorders that are negatively affecting the tree's structural condition.
          Defects in the canopy, weak unions, actively decaying wounds and cavities, and problematically damaged roots.
          Increased tree part failure is predicted.
 H        Hazardous:
          A tree with a major defect and visual faults that may fail at any time
          Active tree part failure is occurring.




26_04_27_AIA_JLTP_12-14 Gympie St                                                                              Page 16 of 17

Page 17

 Abbreviations:
 DSH         Diameter at Standard Height:
             Trunk diameter at 1.4m above ground level.
 NRZ         Notional Root Zone:
             the primary trigger for arboricultural input on a development site.
             NRZ RADIUS = 12 x DSH
 TPZ         Tree Protection Zone:
             as per AS 4970-2025 Protection of trees on development sites, it is the principal means of protecting trees on a
             development site. The TPZ is a combination of the root and crown area requiring protection to be isolated from
             construction disturbance so that the tree can remain in a viable condition. The TPZ incorporates the SRZ.
 SRZ         Structural Root Zone:
             as per AS 4970-2009 Protection of trees on development sites, it is a mathematical calculation of the surface
             area of protection required to maintain a tree’s stability – a larger area is required to maintain a tree in viable
             health. It is only necessary to calculate the SRZ when a major encroachment into a TPZ is proposed.
 Arborists:
 Consulting A suitably qualified and experienced tree expert who provides independent, professional advice about the care,
 Arborist    management, preservation, industry standards / best practice, hazard mitigation and risks associated with trees—
             typically in urban or development contexts.
             Experience in written Arborist Reports, Tree Management Plans and Expert Advice.
             Minimum Qualification AQF level 5 + 5 years
 Project     An arborist specifically appointed to a construction or development project to oversee and manage tree-related
 Arborist    matters in line with planning conditions, Arborist Reports, Environmental guidelines, and industry standards.
             Minimum Qualification AQF level 5
 Craft       An AQF 3 qualified hands-on tree professional who specialises in the physical work of tree care and management,
 Arborist    such as climbing, pruning, removing, or planting trees.


A PPENDIX 2: TPF S IGN
Sample Tree Protection Zone sign for inclusion at the TPZ boundaries.




26_04_27_AIA_JLTP_12-14 Gympie St                                                                                Page 17 of 17