Council archive · source document
arborist · OPW22/0299
Consult Arborist
Pty Ltd
ARBORICULTURAL IMPACT
ASSESSMENT
Site Address: 10 Natasha Ave and 24 Katharina St
Noosa Heads, Qld, 4567
Application reference: MCU21/0231
Local Authority: Noosa Council (Council)
Client / Commissioned by: Mark Bain Construction
Date of report: Monday, 31 October 2022
Prepared by:
Matthew Duncan
Director / Principal Arborist
e: [email protected]
m: 0450 355 770
ABN: 68 153 548 531
T O D A Y ’ S T R E ES F O R T O M O R R O W
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Consult Arborist
This document was prepared for the sole use of, Mark Bain Construction, their 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
This report/document is subject to copyright laws and remains the property of Consult Arborist Pty Ltd.
Penalties @280c per word per incident of unauthorised usage. No part of this report may be reproduced
or used without the written permission of Consult Arborist Pty Ltd. No responsibility will be accepted by
Consult Arborist Pty Ltd for unauthorised or partial use of this report.
General Permission of use as subject to Consult Arborist Pty Ltd copyrights:
• Hard copy permission: Entire copies may be printed for use by the Client 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 22_10_31_AIA_Markbain_Natasha Katharina 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) 31/10/2022 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
BAIN 26-07-22 Chris Clout Design – Noosa Villas
5/09/2022 002 ECM_22091773_v3_Decision Notice - Approved by Delegation of
Authority MCU21 0231
30/08/2022 003 ECM_22091787_v1_Approved Plans - MCU21-0231
21617_20221025 TOD – Civil Engineering Design for Mark Bain Constructions
Note: Extracts from the above document have been used to illustrate the text within this report but should be read with full
documents.
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Consult Arborist
E XECUTIVE S UMMARY
This Arboricultural Impact Assessment report is in response to Noosa Council’s Decision
Notice dated 5 September 2022. As part of the application conditions, Council has requested
that the native trees across the two sites, 10 Natasha Avenue, and 24 Katharina Street, are
assessed and an Arborist Report is provided demonstrating the protection of the retained
trees.
Due to the project design and the constraints of the site, no trees within the two sites or the
council road reserve are proposed to be retained due to design and construction conflict.
Figure 1: Decision Notice Conditions, Retention of Existing Trees, Points 16, 17 and 18
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Consult Arborist
T ABLE OF C ONTENTS
Copyright .............................................................................................................................. 2
Document Control ................................................................................................................. 2
Documents Reviewed ........................................................................................................... 2
Executive Summary .............................................................................................................. 3
Table of Contents.................................................................................................................. 4
1 Brief ............................................................................................................................... 5
2 Site Inspection ............................................................................................................... 5
3 Scope & Limitations ....................................................................................................... 6
3.1 Wildlife Considerations ........................................................................................... 7
3.2 Protected Trees ...................................................................................................... 7
3.3 Contractors Notes ................................................................................................... 7
3.4 Habitat Trees .......................................................................................................... 7
4 Site Findings and Observations ..................................................................................... 8
4.1 Retention Value Status ........................................................................................... 8
5 Tree Summary Table ..................................................................................................... 9
6 Tree Plot Plan .............................................................................................................. 12
7 Site Plans..................................................................................................................... 13
8 Site Pictures................................................................................................................. 15
9 Tree Protection Guidelines ........................................................................................... 16
9.1 The Role of the Project Arborist and Tree Protection ............................................ 16
9.2 Calculating Tree Protection ................................................................................... 17
9.2.1 Tree Protection Zone (TPZ) ........................................................................... 17
9.2.2 Structural Root Zone (SRZ) ........................................................................... 17
9.3 Establishing Tree Protection ................................................................................. 18
9.4 TPZ Signs ............................................................................................................. 18
9.5 Trunk Protection ................................................................................................... 18
9.6 Restricted Activities Within the TPZ ...................................................................... 19
9.7 TPZ Standard Mitigation Measures ....................................................................... 19
10 References: .............................................................................................................. 20
11 Assumptions and Disclaimer .................................................................................... 20
Appendix 1 - Definition of Terms ......................................................................................... 21
Appendix 2 – Sample TPZ Fencing Sign ............................................................................. 22
Appendix 3 – Tree Catalogue.............................................................................................. 23
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Consult Arborist
1 B RIEF
This Arboricultural Impact Assessment (AIA) report was commissioned by Mark Bain
Construction on behalf of their client. In response to Noosa Council MUC conditions 16, 17,
and 18, Retention of Existing Trees, Consult Arborist has been commissioned to conduct a
Tree Survey of the trees within the two sites at 10 Natasha Avenue and 24 Katharina Street,
the council road reserve, and trees directly adjacent to the site boundary within the
neighbouring properties. This report and assessment take into account the project design and
the current condition and suitability of the existing vegetation.
2 S ITE I NSPECTION
Matthew Duncan, the Director and Principal Arborist of Consult Arborist, undertook the Visual
Tree Assessment on the site from a ground level on Monday, 17 October 2022. Matthew holds
an AQF Level 5 Diploma of Arboriculture (AHC50510), an International Society of
Arboriculture’s Tree Risk Assessment Qualification, valid from 2015 to 2025, and has worked
in the arboricultural industry since 1994. Since its establishment in 2011, Consult Arborist has
been engaged to provide arboricultural advice and guidance on private, civil, and capital works
projects from cross-sector clients throughout Queensland where he is a Queensland
Arboricultural Association (QAA) Qualified Member and Approved Consultant.
Figure 2: Overview of the subject site
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Consult Arborist
3 S COPE & L IMITATIONS
The purpose of this report is to provide advice and guidance on the subject trees' retention
status in relation to the proposed works with guidance for tree protection measures to be used
on trees deemed for retention.
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 with the practical
consideration of the suitable retention of individual trees where suitable.
The subject trees detailed within the report have received an International Society of
Arboriculture (ISA) Basic Level 2 assessment with consideration to the design and future use
of the Project.
No trunk decay detection equipment or ground radar was used as part of this Arboricultural
Appraisal, 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. All data is based on visual inspection based on known
industry methodology of visual tree assessment VTA, of the tree/s and its/their location,
species, health, and condition at the time of inspection unless otherwise stated.
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.
This report does not take into consideration changes to the site design or activities of which
Consult Arborist has not been requested to comment on or been advised of.
The relevant tree information has been recorded to be used as a functional proactive tool to
determine a management strategy for the tree, taking into account the tree’s condition, species
age, location, project design and future use of the site.
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.
The Tree Protection Plan advises on the methods for protection of the retained trees and is
guided by the Australian Standard, AS4970-2009 Protection of trees on development sites,
industry best practice and professional experience.
https://www.easymapmaker.com/map/22_10_MBain_24_Katharina_St_TPZ
Note:
• The Site Map is for reference only, is not to scale, the locations for the tree plots are a
representation of the tree’s location with the use of an iPad plotting function and
mapped using www.easymapmaker.com. The site plan is to be used in conjunction
with the information within the VTA results.
• With the use of an iPad, photographs of the subject trees have been taken when
required and the light/exposure has been adapted to improve the clarity of the picture
quality.
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Consult Arborist 3.1 WILDLIFE CONSIDERATIONS The DEHP (Department of Environment and Heritage Protection) should be consulted in regard to regulations concerning tree removal. The Nature Conservation Act 1992 provides statutory protection for most species of native animals and any tree work which affects them may constitute an offence. In addition, the Nature Conservation and Other Legislation (Koala Protection) Amendment Regulation amended the Environmental Offsets Regulation 2014, Planning Regulation 2017, Nature Conservation (Koala) Conservation Plan 2017 and Vegetation Management Regulation 2012 to provide increased protection to koala habitat areas in South East Queensland. A qualified Fauna Spotter-Catcher should be consulted prior to tree works being carried out where wildlife may be active. 3.2 PROTECTED TREES Prior to carrying out any tree work, it is recommended to check with the local authority to ensure there is no protection order placed on the trees. Should any tree be deemed to be legally protected, it will be necessary to consult the local Council before removal can be carried out. 3.3 CONTRACTORS NOTES Recommended arboricultural works are to be carried out by an arborist holding a minimum of a Level 3 AQF qualification in Arboriculture with good working experience. It is expected that the Arborist may encounter anomalies within the tree as they climb/work and as such may use their discretion to remove any further branches or limbs which they may deem could pose an immediate risk. Additional removals outside the recommendations or defects noted whilst in the tree are to be recorded and reported to the author and/or discussed with a Level 5 Arborist on site prior to undertaking the appropriate action. All pruning to be in accordance with, or guided by AS 4373 – “Pruning of Amenity Trees” 3.4 HABITAT TREES When undertaking remedial tree works on habitat trees, please be aware of the fauna and their habitat. The creation of future habitat whilst undertaking remedial works is to be considered. When mitigating hazardous deadwood, hollow sections and large branches, minimal pruning or reduction of weight is required rather than total removal. Hollow sections take many years to be created and are a highly valuable habitat. Coronet cuts should be facilitated where appropriate to mimic natural branch failure on suitable trees in a natural setting. 22_10_31_AIA_Markbain_Natasha Katharina Page 7 of 26
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Consult Arborist
4 S ITE F INDINGS AND O BSERVATIONS
The site is in the Noosa Council coastal suburb of Noosa Heads and is currently occupied by
two multi-residential units that are proposed for demolition to make way for the construction of
the new multi-dwelling complex.
The subject vegetation throughout the site consists of originally planted landscaping and
naturally occurring native trees of differing ages and conditions. The centre of the site contains
mainly older natives, while the road reserves are a mix of naturally occurring local natives,
formally planted trees, and mixed exotic understory.
The approved project design maximises the permittable building envelope of the two sites and
outdoor living areas. This design conflicts directly with the majority of the vegetation on the
site and the remaining vegetation are of Low retention value and would be unsuitable for
retention during the construction phase and the future use of the site.
Both road reserve verges are sloping in nature and the earthworks design shows shallow Cut
and Fill is required to facilitate the front wall, driveway, and conditioned formal footpaths.
Trees in the neighbouring properties of 8 Natasha and 22 Katharina are located close to the
site boundary. The civil design for the site requires the installation of deep continuous piers to
create the required inground retaining wall structure. These works will likely impact the
neighbouring trees and consultation with the owners is recommended. As per Noosa Council
conditions, this report response does not require neighbouring trees to be addressed.
4.1 RETENTION VALUE STATUS
The retention value status is based on industry-recognised methods of ascertaining the
retention value of a tree. The suitability of the tree for preservation or retention is based on the
individual qualities of each tree within the approved project design. By taking into consideration
the health, structural condition, aesthetics, age, size, longevity (Safe Useful Life Expectancy)
and ability to adapt to new environments the viability of the tree can be reasonably determined.
For trees in non-use areas (e.g., Open spaces) where a range in tree quality is appropriate,
all trees may be considered suitable, except for invasive species.
Suitability for Retention/Preservation Categories are:
• High - Tree retention is the priority. The tree has high amenity, heritage and/or
environmental value. It is in reasonably good condition (any minor structural or health
problems can be mitigated), has a long life expectancy and can recover from injury or
respond to environmental changes.
• Medium – Tree retention is desirable. The tree is in fair-good condition, is a locally
common species, the tree contributes to the aesthetics of its locality and should survive
for many years. The tree may have health or structural problems that can be mitigated
with treatment.
• Low – Tree is not considered worthy of special measures to ensure its retention. The tree
is in poor condition with significant defects that cannot be mitigated, has a short Useful
Life Expectancy, or the tree is expected to decline regardless of treatment. The tree has
low value in the landscape or is an undesirable species.
• Very Low - Tree removal is recommended. Trees are considered potentially hazardous,
very poor specimens, and/or may be environmental or noxious weeds.
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Consult Arborist
5 T REE S UMMARY T ABLE
This table is a summary of native and prominent vegetation located in the Noosa Council road
reserves, the two site properties, and the adjacent neighbours’ properties directly next to the
boundaries.
Throughout the sites, there are planted landscapes of exotics, palms, canes, and naturally
occurring small trees with an understory of general vegetation that is proposed to be removed.
Retention
ID Location Common Name Age Comments Recommendations
Status
Suppressed form.
Road reserve Early Outside project
1 Lilly pilly Low Next to the fence in front of the
Natasha Ave Mature scope
neighbour’s property.
Road reserve Remove - design
2 Foxtail palm Young Low Planted next to the fence.
Natasha Ave conflict
Road reserve Remove - design
3 Foxtail palm Young Low Planted central in the road reserve.
Natasha Ave conflict
Road reserve Weeping / Fine-leaf Remove - design
4 Mature Medium Central in the road reserve.
Natasha Ave Paperbark conflict
Road reserve Remove - design
5 Golden Duranta Mature Low Weed shrubs.
Natasha Ave conflict
Road reserve Singapore orchid Remove - design
6 Mature Low Multi stem.
Natasha Ave tree conflict
Road reserve Early Central road reserve. Change of Remove - design
7 Tuckeroo Medium
Natasha Ave Mature ground level. conflict
Road reserve Remove - design
8 Lemon scented gum Mature Medium Edge of existing driveway.
Natasha Ave conflict
Road reserve Asymmetrical canopy. Next to the Remove - design
9 Wattle Mature Low
Natasha Ave existing driveway. conflict
Neighbour's tree 2-3m from the Outside project
10 8 Natasha Ave Lemon scented gum Mature High boundary, at a ground level lower scope - TPZ
than the site. conflict.
Remove - design
11 10 Natasha Ave Umbrella tree Mature Low Undesirable species.
conflict
1m on the neighbour's side of the Outside project
12 8 Natasha Ave Silky oak Mature Medium fence. scope - TPZ
Ground level lower than the site. conflict.
Early Remove - design
13 10 Natasha Ave Tuckeroo Medium On the fence line.
Mature conflict
Declining health. Outside project
14 8 Natasha Ave She oak Mature Low Canopy encroaching over the scope - TPZ
fence. conflict.
On the fence line in the
Outside project
neighbouring property.
15 8 Natasha Ave Tuckeroo Mature Medium scope - TPZ
Canopy encroaching over the
conflict.
fence.
Asymmetrical canopy.
Remove - design
16 10 Natasha Ave Brushbox Mature Low Dead side stems.
conflict
Previously topped and regrown.
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Consult Arborist
Retention
ID Location Common Name Age Comments Recommendations
Status
Remove - design
17 10 Natasha Ave Fig Mature Low Unsuitable species for the site.
conflict
Early Asymmetrical. Remove - design
18 10 Natasha Ave White cedar Low
Mature Malformed lower trunk. conflict
Early Malformed structure. Remove - design
19 10 Natasha Ave Weeping fig Low
Mature Unsuitable for long-term retention. conflict
Remove - design
20 10 Natasha Ave Brushbox Mature Low Multi stem, previously topped.
conflict
Remove - design
21 10 Natasha Ave Jacaranda Mature Low Multi-stem spreading canopy.
conflict
Remove - design
22 10 Natasha Ave Bribie Island pine Mature Medium
conflict
Outside project
23 22 Katharina St Brushbox Mature Medium Tri stem scope - TPZ
conflict.
Remove - design
24 10 Natasha Ave Bribie Island pine Mature Medium .
conflict
Remove - design
25 10 Natasha Ave Bribie Island pine Mature Medium In corner of the property.
conflict
Small-leafed Cheese Asymmetrical. Remove - design
26 10 Natasha Ave Mature Low
tree On top of a retaining wall. conflict
Remove - design
27 10 Natasha Ave Tuckeroo Mature Low On top of a retaining wall.
conflict
Group of three trees to be treated Remove - design
28 10 Natasha Ave Brushbox Mature Medium
as one. conflict
Early Remove - design
29 10 Natasha Ave Bribie Island pine Low
Mature conflict
Remove - design
30 10 Natasha Ave Cocos palm Mature Low Weed species
conflict
Remove - design
31 10 Natasha Ave Cocos palm Mature Low Weed species
conflict
Weed species. Remove - design
32 10 Natasha Ave Cocos palm Mature Low
Tri-stem Cocos palm conflict
Early Asymmetrical towards the site. Remove - design
33 10 Natasha Ave Weeping fig Low
Mature Unsuitable species of retention. conflict
1m from the fence inside the site. Remove - design
34 10 Natasha Ave Silky oak Mature Low
Reduced vigour. conflict
Remove - design
35 10 Natasha Ave Macaranga Mature Low Recently deceased tree.
conflict
Early Suppressed form. Remove - design
36 10 Natasha Ave Silky oak Low
Mature Next to the fence. conflict
Reduced vigour.
Remove - design
37 10 Natasha Ave Silky oak Mature Low Unsuitable species for long-term
conflict
retention.
Front boundary 24 Early Remove - design
38 Hard quandong Low Multi stem.
Katharina St Mature conflict
Front boundary 24 Early Front boundary. Remove - design
39 Pink bloodwood Medium
Katharine St Mature Reduced vigour. conflict
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Consult Arborist
Retention
ID Location Common Name Age Comments Recommendations
Status
Front boundary 24 Remove - design
40 Cocos palm Mature Low Weed species
Katharina St conflict
Early Remove - design
41 24 Katharina St Mango Low In boundary
Mature conflict
Remove - design
42 24 Katharina St Moreton Bay ash Mature Low Reduced vigour. On boundary.
conflict
On top of a retaining wall. Remove - design
43 24 Katharina St Tuckeroo Mature Medium
Unsuitable for long-term retention. conflict
On top of a retaining wall. Remove - design
44 24 Katharina St Tuckeroo Mature Low
Unsuitable for long-term retention. conflict
Remove - design
45 24 Katharina St Hoop pine Mature Medium Centre of the site.
conflict
Early Unsuitable species for long-term Remove - design
46 24 Katharina St Bunya Pine Low
Mature retention. conflict
Outside project
47 22 Katharina St Pink bloodwood Mature Medium Canopy favouring towards the site. scope - TPZ
conflict.
On the neighbouring side of the Outside project
48 22 Katharina St Tuckeroo Mature Medium property boundary. scope - TPZ
Tree favouring towards the site. conflict.
Outside project
Over Neighbour’s side of the boundary.
49 22 Katharina St Wattle Low scope - TPZ
mature Tree in declining health.
conflict.
Outside project
Twin stem.
50 22 Katharina St Tuckeroo Mature Medium scope - TPZ
Neighbour's side of the boundary.
conflict.
Outside project
Front boundary 22 Over
51 Wattle Medium Aged tree with reduced vigour. scope - TPZ
Katharina St mature
conflict.
Front boundary 24 Remove - design
52 Pink bloodwood Mature Medium On the front corner boundary.
Katharina St conflict
Front boundary 24 Group on the front boundary. Remove - design
53 Umbrella tree Mature Low
Katharina St Undesirable species. conflict
Front boundary 24 Early Remove - design
54 Tuckeroo Low On the front boundary.
Katharina St Mature conflict
*Please see Appendix 3 Tree Catalogue for full tree details
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Consult Arborist
6 T REE P LOT P LAN
Figure 3: Site Tree Plot showing individual trees colour coded for retention value within the
project design and symbols depicted Tree Protection Zones (TPZ)
Not to Scale
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Consult Arborist
7 S ITE P LANS
Figure 4: Noosa Council Stamped approved plans showing the project layout.
Please note the dotted tree symbols do not depict trees for retention
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Consult Arborist
Figure 5: Todd Engineering - General Arrangement plan illustrating that the entire site will be subject to civil
design and construction.
Both road reserves feature the construction of formal concrete paths and upgrades to inground services.
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8 S ITE P ICTURES
Pictures of the two site frontages on Natasha Avenue and Katharina Street, Noosa Heads.
Figure 6: Frontage of 10 Natasha Ave that requires earthworks Figure 7: Approved new driveway location conflicting
and the conditioned installation of a formal footpath which will with trees on the verge.
conflict with all trees on the verge.
Figure 8: The frontage of 24 Katharina St that requires earthworks Figure 9: Trees on the frontage corner boundary with
and the conditioned installation of a formal footpath which will 22 Katharina St
conflict with all trees on the verge.
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Consult Arborist 9 T REE P ROTECTION G UIDELINES With no trees either on the site or within the council road reserve proposed to be retained due to project and civil design requirements, the tree protection measures are to be used as a guide for the trees within the neighbouring properties. It is advised that discussions are held with the neighbouring property owners in regard to the impact on the trees that may occur during the construction phase. For the proposed retention of the trees adjacent to the site, the following guidelines are recommended to be implemented to minimise the impact of the project works. The protection recommendations offered are guided by, AS4790 – 2009 Protection of trees on development sites, industry best practices and the supervising presence of a suitably qualified and experienced Arborist with a high level of experience as an onsite Project Arborist. The information within these Guidelines is generic for practical use with common sense and discretion. The successful retention of the trees will be bettered by the education and cooperation of all parties of the construction team during the build and the presence of the Project Arborist on site to assist and advise during the construction phase for all works carried out adjacent to the TPZ of protected trees. ALL workers on the site are to be made aware of the Tree Protection Guidelines and any site- specific measures by the main contractor prior to commencing works. 9.1 THE ROLE OF THE PROJECT ARBORIST AND TREE PROTECTION An Arboricultural Assessment undertaken by the Project Arborist will outline the trees that require consideration. The information within these Tree Protection Guidelines should be read in conjunction with guidelines laid out in the Australian Standard, AS4970–2009 Protection of Trees on Development Sites and ongoing advice from the Project Arborist. A designated onsite foreman/supervisor from the construction company is to liaise with the Project Arborist to ensure that Tree Protection is adhered to in their absence from the site. A Post Construction Arborist Report can be prepared by the Project Arborist on request for the retained tree comprising a Visual Tree Assessment detailing each of the trees’ condition and vigour, damage or disturbance which may have occurred, and remedial works are undertaken. After the final inspection, a Certification of Compliance can be supplied along with any monitoring documentation as required. The Project Arborist may at any time implement new or additional procedures as may be required for the site in the best interest of the trees and the development as a whole. 22_10_31_AIA_Markbain_Natasha Katharina Page 16 of 26
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9.2 CALCULATING TREE PROTECTION
The descriptions of the Tree Protection Zone (TPZ) and Structural Root Zone (SRZ) are from
the Australian Standards, AS 4970-2009 Protection of trees on development sites. These
descriptions provide the basic prerequisites to calculate the TPZ and SRZ, and the
compensates for when encroachment or a reduction in the size/area of the TPZ is required to
facilitate a development: see Appendix D of the Australian Standard AS 4970-2009.
Many factors need to be taken into consideration when estimating tree root growth and spread.
9.2.1 TREE PROTECTION ZONE (TPZ)
As specified in the Australian Standard, AS 4970-2009, the TPZ is the principal means of
protecting trees on a development site. The TPZ calculates the radius of a circular area
combining the root and crown spread of a tree for protection and isolation from construction
disturbance so the tree can remain in a viable condition for the future. The TPZ incorporates
the SRZ.
DBH = Diameter at Breast Height - trunk diameter measured at 1.4m above ground
TPZ RADIUS = Twelve times the DBH
Example: .5m DBH x 12 = 6m TPZ RADIUS.
A TPZ should not be less than 2m or greater than 15m unless additional crown protection is
required.
9.2.2 STRUCTURAL ROOT ZONE (SRZ)
The SRZ, as specified in AS 4970-2009, is the minimum surface area of protection required
around a tree to maintain that tree’s stability – a larger area than this is required to maintain a
tree in a viable condition for the future. It is only necessary to calculate the SRZ when major
encroachment into a TPZ is proposed.
An indicative SRZ RADIUS can be determined from the lower trunk diameter (above the root
buttress), D, measured in metres and applying the following formula:
0.42
RSRZ = (D x 50) x 0.64
The SRZ RADIUS for trees with a trunk diameter less than 0.15m will automatically be 1.5m.
Please note that these are theoretical calculations and are to be used as a guide. Large tree
species, particularly Fig trees, will have woody structural and feeder roots that extend to a
greater distance than the calculations. Trees within urban environments where solid
structures restrict root growth can also alter a tree’s root spread and direction. An additional
water/food source would also encourage roots to grow further than expected.
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9.3 ESTABLISHING TREE PROTECTION
Figure 10 shows a typical representation of a tree protection system. Tree root systems are
generally shallow in nature with most of the roots found within the top 1m of soil and a higher
density of roots found closest to the surface where moisture and nutrients are more readily
available. The function of the TPZ is to ensure that the tree has a viable root system, so the
tree has a functional future as an amenity asset within the development.
The structural standing of a tree is linked to critical aspects of roots (found in the TPZ) to bind
the soil and create a mass that the tree can anchor to. These roots consist of ‘Secondary roots’
(medium size) and ‘Tertiary roots’ (small size).
Primary roots (large size) found in the SRZ connect the tree to the anchor system. Primary
roots by themselves do not bind enough soil to create a stable anchor system.
The shallow nature of tree roots should be taken into consideration when working close to
trees and when installing the tree protection fencing for the Tree Protection Zone.
Figure 10: Example of an ideal generic Tree Protection System
9.4 TPZ SIGNS
The signs identifying the TPZ / ‘No-Go Zone’ are to be placed around the edge of the TPZ in
locations visible to the site as per Tree Protection Fencing Standards Australia marketing
media AS4970 – 2009.
9.5 TRUNK PROTECTION
Trunk protection, to prevent direct contact with the tree’s trunk and buttress roots can be
installed. This can comprise Geo fab/20mm thick hessian and wooden battens strapped/taped
to the tree’s trunk with a skirt over the buttress roots.
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Consult Arborist
9.6 RESTRICTED ACTIVITIES WITHIN THE TPZ
Restricted activities within the TPZ that would cause harm to the retained trees include, but
are not limited to:
• Any non-approved construction works, excavation, or cultivation of the ground.
• Any non-approved storage.
• Dumping of waste or placement of Fill.
• Any non-approved soil level changes.
• Parking of vehicles and plant.
• Preparation of chemicals, including cement products.
• Wash down and cleaning of equipment.
• Refuelling.
• Temporary or permanent installation of utilities and signs.
• Lighting fires.
• Physical damage to the tree.
9.7 TPZ STANDARD MITIGATION MEASURES
Remediation measures can be undertaken to limit and reduce negative effects that may occur.
Where suitable, the retained trees’ TPZ areas should be improved to provide a more
favourable and beneficial growing environment for tree roots. Use sandy loam where raised
soil levels are required to improve drainage and allow gaseous exchange. Trees can adapt to
low levels of Fill over the existing ground if undertaken with the correct material and in some
circumstances, this additional medium can provide ideal rooting conditions for feeder roots
and a beneficial food source for the tree.
The following recommendations, if followed, should improve an existing plant’s vigour, and in
turn benefit the plant’s health, safety, and amenity value. These can be incorporated into the
project landscaping details.
Implement the following where groundworks are carried out adjacent to, or encroach into, the
TPZ areas if deemed appropriate by Consult Arborist:
• The Project Arborist is to advise and oversee mitigation works to retained trees.
• Where possible the excavated ground, including the cut roots, will be covered/backfilled
with quality topsoil locally sourced or a sandy loam/river sand with low organic matter, as
guided by AS 4419—2003. Australian Standard™ Soils for landscaping and garden use.
• Monthly applications of a seaweed-based soil conditioner/plant food to the topsoil as per
the manufacturer’s guidelines for the duration of the project.
• Install/use ground protection measures when access to the TPZ is required to undertake
construction works. All ground protection measures are to be discussed and agreed upon
with the Project Arborist prior to installation. These are to include but are not limited to:
ply sheets; geo fabric; thick mulch layer.
• Supplementary watering (water cart or sprinkler system) to retain adequate moisture
levels in the soil.
All tree works, and tree protection measures, are to be guided by industry best practices and
the relative Australian Standards which include but are not limited to:
• Australian Standards AS4970-2009 Protection of trees on development sites
• Australian Standards AS4373-2007 Pruning of amenity trees
22_10_31_AIA_Markbain_Natasha Katharina Page 19 of 26
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Consult Arborist
10 R EFERENCES :
• Australian Standards AS4970-2009 Protection of trees on development sites (2009).
• 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.
11 A SSUMPTIONS AND D ISCLAIMER
This information contained in this report has been prepared on an independent basis, 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 its/their location at the time of writing, unless otherwise stated, and contains
opinions, advice and recommendations based on information and data gathered from site inspections carried out by the author
and information supplied by the Client (Mark Bain Construction).
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 caused or alleged to have been caused (including loss or damage resulting from negligence) either directly or indirectly,
by your use of the information made available in this report. In no event will the author be liable to you for any lost revenue or
profits, or for special, indirect, consequential, or incidental damage (however caused and regardless of the theory of liability)
arising out of or related to your use of that information, even if the author has been advised of the possibility of such a loss or
damage.
Consult Arborist cannot be held responsible for the effects of non-conformance works performed, by unsuitably qualified staff or
without the supervision of Consult Arborist.
Unless otherwise stated this report cannot be used within a court of law or any legal situation without the prior consent of Consult
Arborist Pty Ltd. The author shall not be required to give testimony or to attend court by reason of this report unless subsequent
contractual arrangements have been made.
The information contained in this report refers only to the tree/s that were inspected on 17/10/2022 and reflects the condition of
the tree/s at the time of the inspection.
There is no warranty or guarantee, expressed or implied, that the problems or deficiencies of the plants or property in question
may not arise in the future. Likewise, remedial treatments cannot be guaranteed.
Arboriculturalists cannot detect every condition that could possibly lead to the structural failure of a tree. Trees are living
organisms that fail in ways we do not fully understand. Conditions are often hidden within trees and 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 of time.
This report does not take into consideration the possibility of extreme weather or other events over which Consult Arborist Pty
Ltd has no control.
Treatment, pruning and removal of trees may involve considerations beyond the scope of the Arboriculturalists services, such as
property boundaries and ownership, disputes between neighbours, sightlines, landlord-tenant matters and related. Consult
Arborist Pty Ltd cannot take such issues into account unless complete and accurate information is given to them. Likewise,
Consult Arborist Pty Ltd cannot accept any responsibility for the authorization or non-authorization of any recommended treatment
or remedial measure.
Arboriculturalists are tree 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. Trees can be managed,
but they cannot be controlled. To live or work near a tree involves some degree of risk. The only way to eliminate all risks
associated with a tree is to eliminate the tree.
Clients may choose to accept or disregard the recommendations of Consult Arborist Pty Ltd or to seek additional advice.
22_10_31_AIA_Markbain_Natasha Katharina Page 20 of 26
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Consult Arborist
A PPENDIX 1 - D EFINITION OF T ERMS
The following criteria have been used in the VTA and arboricultural appraisal to gather information and determine
the required management options on the grounds of public health and safety. Measurements are approximate,
made visually by eye unless otherwise stated.
Age Class:
Young: Early-stage of growth, immature size
Early Mature: Fast-growing well-established tree which has not yet reached mature size
Mature: The tree reached its mature size, exhibits slowing growth rates with early stages of naturally
forming dead or dysfunctional wood.
Over Mature: Tree has reached mature size and is unlike to increase significantly in height or mass.
Retrenchment of the upper crown with increased vegetative vitality in lower crown, increased
fungal activity and wood decay, increase colonisation by flora and fauna.
Veteran: Tree with advanced retrenchment, reduced crown size and annual increment growth,
extensive hollowing, crown collapse, low vigour, advanced heartwood decay, advanced
colonisation by fauna and flora.
Health:
Good: Tree with no defects or disorders which are notable. Full canopy with good colour foliage.
Minimal pathogen damage.
Fair: Tree with minor defects or disorders which are notable. Some dead wood within what can be
an unbalanced canopy, foliage generally with good colour although some discolouration may
be present typical of species in location. Minor pathogen damage.
Poor: Tree with major defects or disorders which are notable. Tree has considerable deadwood
present, discoloured or distorted leaves indicating a further decline of the tree. Detrimental
pathogen damage.
Dead: Dead or dysfunctional moribund tree.
Structure:
Good: Tree with good unions and no branch defects. Sound trunk with no / minor defects. Good
buttress and root structure.
Fair: Tree with minor defects or disorders which are notable. Small areas of bark missing. Small
cavities or minor unfavourable branch unions may be present. Minor damage to roots.
Poor: Tree with major defects, large hollows, weak unions and/or problematic damaged roots.
Hazardous: This implies a tree with a major defect that may fail at any time
Protection of Trees:
TPZ: As specified in the AS 4970-2009 Protection of trees on development sites, the Tree
Protection Zone (TPZ) is the principal means of protecting trees on a development site. The
TPZ is a combination of the root and crown area requiring protection. This area should be
isolated from construction disturbance so that the tree can remain in a viable condition. The
TPZ incorporates the Structural Root Zone (SRZ).
The radius of the TPZ is calculated for each tree by multiplying its trunk diameter at 1.4m
above ground by 12, e.g., 300mm [email protected] x 12 = 3.6m Tree Protection Zone (TPZ)
A TPZ should not be less than 2m or greater than 15m (unless crown protection is required).
SRZ: Structural Root Zone (SRZ), as specified in AS 4970-2009 Protection of trees on
development sites, is 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 major encroachment into a TPZ is proposed.
The SRZ for trees with a trunk diameter less than 150mm will be 1.5m.
DBH: Diameter at Breast Height - The approximate diameter of the trunk is measured visually in
millimetres at a height of 1.4m.
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Consult Arborist A PPENDIX 2 – S AMPLE TPZ F ENCING S IGN 22_10_31_AIA_Markbain_Natasha Katharina Page 22 of 26
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Consult Arborist
A PPENDIX 3 – T REE C ATALOGUE
TPZ SRZ
Botanical Common Height Spread DBH Retention
ID Location Age Health Structure (m) (m) Comments Recommendations
Name Name (m) (m) (mm) Status
(R) (R)
Suppressed form.
Road reserve Syzygium Early 200 - Outside project
1 Lilly pilly Poor Poor 4-6 2-4 3 2.0 Low Next to the fence in front of the
Natasha Ave species Mature 300 scope
neighbour’s property.
Road reserve Wodyetia Remove - design
2 Foxtail palm Young Good Good <4 <2 < 100 2 1.5 Low Planted next to the fence.
Natasha Ave bifurcate conflict
Road reserve Wodyetia Planted central in the road Remove - design
3 Foxtail palm Young Good Good <4 <2 < 100 2 1.5 Low
Natasha Ave bifurcate reserve. conflict
Road reserve Melaleuca Weeping / Fine- 400 - Remove - design
4 Mature Good Good 8-10 4-6 5.4 2.6 Medium Central in the road reserve.
Natasha Ave leucadendra leaf Paperbark 500 conflict
Road reserve 100 - Remove - design
5 Duranta erecta Golden Duranta Mature Fair Fair 4-6 2-4 2 1.6 Low Weed shrubs.
Natasha Ave 200 conflict
Road reserve Bauhinia 200 - Remove - design
6 Orchid tree Mature Fair Poor 4-6 4-6 3 2.0 Low Multi stem.
Natasha Ave species 300 conflict
Road reserve Cupaniopsis Early 300 - Central road reserve. Change of Remove - design
7 Tuckeroo Good Good 6-8 4-6 4.2 2.3 Medium
Natasha Ave anacardioides Mature 400 ground level. conflict
Road reserve Corymbia Lemon scented 400 - Remove - design
8 Mature Good Good 14-16 6-8 5.4 2.6 Medium Edge of existing driveway.
Natasha Ave citriodora gum 500 conflict
Road reserve 200 - Asymmetrical canopy. Next to Remove - design
9 Acacia species Wattle Mature Good Fair 6-8 4-6 3 2.0 Low
Natasha Ave 300 the existing driveway. conflict
Neighbour's tree 2-3m from the Outside project
8 Natasha Corymbia Lemon scented 600 -
10 Mature Good Good 16-20 12-14 7.8 3.0 High boundary, at a ground level lower scope - TPZ
Ave citriodora gum 700
than the site. conflict.
10 Natasha Schefflera 300 - Remove - design
11 Umbrella tree Mature Good Good 6-8 4-6 4.2 2.3 Low Undesirable species.
Ave actinophylla 400 conflict
1m on the neighbour's side of the Outside project
8 Natasha Grevillea 400 -
12 Silky oak Mature Good Fair 12-14 6-8 5.4 2.6 Medium fence. scope - TPZ
Ave robusta 500
Ground level lower than the site. conflict.
10 Natasha Cupaniopsis Early 200 - Remove - design
13 Tuckeroo Good Good 6-8 4-6 3 2.0 Medium On the fence line.
Ave anacardioides Mature 300 conflict
Declining health. Outside project
8 Natasha Casuarina 200 -
14 She oak Mature Poor Poor 8-10 4-6 3 2.0 Low Canopy encroaching over the scope - TPZ
Ave species 300
fence. conflict.
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Consult Arborist
TPZ SRZ
Botanical Common Height Spread DBH Retention
ID Location Age Health Structure (m) (m) Comments Recommendations
Name Name (m) (m) (mm) Status
(R) (R)
On the fence line in the
Outside project
8 Natasha Cupaniopsis 400 - neighbouring property.
15 Tuckeroo Mature Good Good 12-14 8-10 5.4 2.6 Medium scope - TPZ
Ave anacardioides 500 Canopy encroaching over the
conflict.
fence.
Asymmetrical canopy.
10 Natasha Lophostemon 400 - Remove - design
16 Brushbox Mature Fair Fair 14-16 6-8 5.4 2.6 Low Dead side stems.
Ave confertus 500 conflict
Previously topped and regrown.
10 Natasha 800 - Remove - design
17 Ficus species Fig Mature Fair Good 14-16 12-14 10.8 3.4 Low Unsuitable species for the site.
Ave 1000 conflict
10 Natasha Melia Early 200 - Asymmetrical. Remove - design
18 White cedar Fair Fair 8-10 6-8 3 2.0 Low
Ave azedarach Mature 300 Malformed lower trunk. conflict
Malformed structure.
10 Natasha Ficus Early 500 - Remove - design
19 Weeping fig Fair Fair 8-10 8-10 6.6 2.8 Low Unsuitable for long-term
Ave benjamina Mature 600 conflict
retention.
10 Natasha Lophostemon 400 - Remove - design
20 Brushbox Mature Fair Poor 14-16 8-10 5.4 2.6 Low Multi stem, previously topped.
Ave confertus 500 conflict
10 Natasha Jacaranda 400 - Remove - design
21 Jacaranda Mature Fair Fair 10-12 10-12 5.4 2.6 Low Multi-stem spreading canopy.
Ave mimosaefolia 500 conflict
10 Natasha Callitris Bribie Island 300 - Remove - design
22 Mature Good Good 14-16 6-8 4.2 2.3 Medium
Ave columellaris pine 400 conflict
Outside project
22 Katharina Lophostemon 500 -
23 Brushbox Mature Good Fair 14-16 10-12 6.6 2.8 Medium Tri stem scope - TPZ
St confertus 600
conflict.
10 Natasha Callitris Bribie Island 400 - Remove - design
24 Mature Good Good 14-16 6-8 5.4 2.6 Medium .
Ave columellaris pine 500 conflict
10 Natasha Callitris Bribie Island 400 - Remove - design
25 Mature Good Good 14-16 6-8 5.4 2.6 Medium In corner of the property.
Ave columellaris pine 500 conflict
10 Natasha Glochidion Small-leafed 300 - Asymmetrical. Remove - design
26 Mature Fair Fair 10-12 6-8 4.2 2.3 Low
Ave ferdinandi Cheese tree 400 On top of a retaining wall. conflict
10 Natasha Cupaniopsis 300 - Remove - design
27 Tuckeroo Mature Good Good 10-12 6-8 4.2 2.3 Low On top of a retaining wall.
Ave anacardioides 400 conflict
10 Natasha Lophostemon 500 - Group of three trees to be treated Remove - design
28 Brushbox Mature Fair Fair 12-14 10-12 6.6 2.8 Medium
Ave confertus 600 as one. conflict
10 Natasha Callitris Bribie Island Early 100 - Remove - design
29 Fair Fair 6-8 2-4 2 1.6 Low
Ave columellaris pine Mature 200 conflict
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Consult Arborist
TPZ SRZ
Botanical Common Height Spread DBH Retention
ID Location Age Health Structure (m) (m) Comments Recommendations
Name Name (m) (m) (mm) Status
(R) (R)
10 Natasha Syagrus 200 - Remove - design
30 Cocos palm Mature Good Good 8-10 2-4 3 2.0 Low Weed species
Ave romanzoffiana 300 conflict
10 Natasha Syagrus 200 - Remove - design
31 Cocos palm Mature Good Good 8-10 2-4 3 2.0 Low Weed species
Ave romanzoffiana 300 conflict
10 Natasha Syagrus 200 - Weed species. Remove - design
32 Cocos palm Mature Good Fair 8-10 4-6 3 2.0 Low
Ave romanzoffiana 300 Tri-stem Cocos palm conflict
10 Natasha Ficus Early 400 - Asymmetrical towards the site. Remove - design
33 Weeping fig Good Fair 14-16 12-14 5.4 2.6 Low
Ave benjamina Mature 500 Unsuitable species of retention. conflict
10 Natasha Grevillea 300 - 1m from the fence inside the site. Remove - design
34 Silky oak Mature Fair Fair 12-14 6-8 4.2 2.3 Low
Ave robusta 400 Reduced vigour. conflict
10 Natasha Macaranga 300 - Remove - design
35 Macaranga Mature Dead Poor 8-10 6-8 4.2 2.3 Low Recently deceased tree.
Ave tanarius 400 conflict
10 Natasha Grevillea Early 100 - Suppressed form. Remove - design
36 Silky oak Fair Fair 8-10 2-4 2 1.6 Low
Ave robusta Mature 200 Next to the fence. conflict
Reduced vigour.
10 Natasha Grevillea 300 - Remove - design
37 Silky oak Mature Fair Fair 14-16 8-10 4.2 2.3 Low Unsuitable species for long-term
Ave robusta 400 conflict
retention.
Front
Elaeocarpus Early 300 - Remove - design
38 boundary 24 Hard quandong Good Fair 8-10 8-10 4.2 2.3 Low Multi stem.
obovatus Mature 400 conflict
Katharina St
Front
Corymbia Early 300 - Front boundary. Remove - design
39 boundary 24 Pink bloodwood Fair Fair 12-14 6-8 4.2 2.3 Medium
intermedia Mature 400 Reduced vigour. conflict
Katharine St
Front
Syagrus 300 - Remove - design
40 boundary 24 Cocos palm Mature Good Good 10-12 2-4 4.2 2.3 Low Weed species
romanzoffiana 400 conflict
Katharina St
24 Katharina Mangifera Early 300 - Remove - design
41 Mango Good Good 8-10 6-8 4.2 2.3 Low In boundary
St indica Mature 400 conflict
24 Katharina Corymbia Moreton Bay 300 - Remove - design
42 Mature Fair Fair 10-12 2-4 4.2 2.3 Low Reduced vigour. On boundary.
St tessellaris ash 400 conflict
On top of a retaining wall.
24 Katharina Cupaniopsis 300 - Remove - design
43 Tuckeroo Mature Good Good 8-10 2-4 4.2 2.3 Medium Unsuitable for long-term
St anacardioides 400 conflict
retention.
On top of a retaining wall.
24 Katharina Cupaniopsis 300 - Remove - design
44 Tuckeroo Mature Fair Fair 8-10 6-8 4.2 2.3 Low Unsuitable for long-term
St anacardioides 400 conflict
retention.
22_10_31_AIA_Markbain_Natasha Katharina Page 25 of 26
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Consult Arborist
TPZ SRZ
Botanical Common Height Spread DBH Retention
ID Location Age Health Structure (m) (m) Comments Recommendations
Name Name (m) (m) (mm) Status
(R) (R)
24 Katharina Araucaria 500 - Remove - design
45 Hoop pine Mature Good Good 16-20 6-8 6.6 2.8 Medium Centre of the site.
St cunninghamii 600 conflict
24 Katharina Araucaria Early 300 - Unsuitable species for long-term Remove - design
46 Bunya Pine Good Good 10-12 4-6 4.2 2.3 Low
St bidwillii Mature 400 retention. conflict
Outside project
22 Katharina Corymbia 400 - Canopy favouring towards the
47 Pink bloodwood Mature Fair Fair 12-14 6-8 5.4 2.6 Medium scope - TPZ
St intermedia 500 site.
conflict.
On the neighbouring side of the Outside project
22 Katharina Cupaniopsis 400 -
48 Tuckeroo Mature Good Good 10-12 8-10 5.4 2.6 Medium property boundary. scope - TPZ
St anacardioides 500
Tree favouring towards the site. conflict.
Neighbour’s side of the Outside project
22 Katharina Over 300 -
49 Acacia species Wattle Fair Fair 10-12 8-10 4.2 2.3 Low boundary. scope - TPZ
St mature 400
Tree in declining health. conflict.
Twin stem. Outside project
22 Katharina Cupaniopsis 300 -
50 Tuckeroo Mature Good Good 10-12 8-10 4.2 2.3 Medium Neighbour's side of the scope - TPZ
St anacardioides 400
boundary. conflict.
Front Outside project
Over 400 -
51 boundary 22 Acacia species Wattle Fair Fair 8-10 8-10 5.4 2.6 Medium Aged tree with reduced vigour. scope - TPZ
mature 500
Katharina St conflict.
Front
Corymbia 400 - Remove - design
52 boundary 24 Pink bloodwood Mature Fair Fair 10-12 8-10 5.4 2.6 Medium On the front corner boundary.
intermedia 500 conflict
Katharina St
Front
Schefflera 200 - Group on the front boundary. Remove - design
53 boundary 24 Umbrella tree Mature Good Fair 6-8 4-6 3 2.0 Low
actinophylla 300 Undesirable species. conflict
Katharina St
Front
Cupaniopsis Early 100 - Remove - design
54 boundary 24 Tuckeroo Good Fair 6-8 4-6 2 1.6 Low On the front boundary.
anacardioides Mature 200 conflict
Katharina St
22_10_31_AIA_Markbain_Natasha Katharina Page 26 of 26
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