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22_11_21_TMP_Stockwell_Medihub
Consult Arborist
Pty Ltd
TREE
MANAGEMENT
PLAN
Site Address: Medihub
Noosa Civic
28 Eenie Creek Road
Noosaville, Qld, 4566
Application reference: MCU22/0038
Local Authority: Noosa Council (Council)
Report Style: Decision Notice
Client / Commissioned by: Stockwell Development Group Pty Ltd
Date of report: Monday, 21 November 2022
Prepared by:
Matthew Duncan
Director / Principal Arborist
e: [email protected]
m: 0450 355 770
ABN: 68 153 548 531
T O D AY ’ S T RE E S F O R T O M OR R O W
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Page 2
Consult Arborist This document was prepared for the sole use of, Stockwell Development Group Pty Ltd 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 OPYRI GHT 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 ON TROL The latest approved version of this 22_11_21_TMP_Stockwell_Medihub 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) 21/11/2022 MJD SD MJD D OCUMENT S R EVIEWED The following documents have been reviewed, analysed and referenced during the production of this report. Reference / Date Title / Details 2022-08-18_-_DA_Architect_Drawings Buchan Architect Drawings 2022-08-23_-_DA_Conditions Noosa Council 23/08/2022 Decision Notice AU007281-01 Detail Survey (Preliminary) RPG Preliminary Detail Survey Note: Extracts from the above document have been used to illustrate the text within this report but should be read with full documents. 22_11_21_TMP_Stockwell_Medihub Page 2 of 22
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Consult Arborist
E XECUTIV E S UMMARY
This Tree Management Plan is in response to Noosa Council’s Decision Notice dated 23
August 2022 where information is requested to fulfil conditions 31-34 concerning the Retention
of Existing Vegetation within the Covenant Area. The report is to be submitted before
Operational Works approval is gained by Stockwell. A $30,000 bond has been placed on the
trees by the council and will be drawn down if required if trees within the covenant area are
damaged and if compensation is enforced.
This report focuses only on trees within the covenant area of vegetation located on the
northern side of the site. All other existing trees within the site boundary are to be removed.
Tree protection guidelines and methodology are provided for trees located within the covenant
area that are in close proximity to the approved project design.
Figure 1: Site / Covenant Area boundary
Figure 2: Project plan extract showing Covenant Area extent.
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Consult Arborist
T ABLE OF C ONTEN TS
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
5 Covenant Boundary Tree Schedule .................................................................................... 10
6 Site-specific Tree Protection Measures .............................................................................. 11
6.1 Swale .............................................................................................................................. 11
6.2 Site / TPZ – Exclusion Zone Plan ................................................................................ 12
6.3 Tree Protection Fencing (TPF)..................................................................................... 13
7 Tree Protection Guidelines ................................................................................................... 14
7.1 The Role of the Project Arborist and Tree Protection ................................................ 14
7.2 Calculating Tree Protection .......................................................................................... 15
7.2.1 Tree Protection Zone (TPZ) .................................................................................. 15
7.2.2 Structural Root Zone (SRZ) .................................................................................. 15
7.3 Establishing Tree Protection ........................................................................................ 16
7.4 TPZ Signs ...................................................................................................................... 16
7.5 Trunk Protection ............................................................................................................ 16
7.6 Restricted Activities Within the TPZ............................................................................. 17
7.7 TPZ Standard Mitigation Measures ............................................................................. 17
8 General Excavation Methodologies.................................................................................... 18
9 References: ........................................................................................................................... 19
10 Assumptions and Disclaimer ............................................................................................ 19
Appendix 1 - Definition of Terms ................................................................................................. 20
Appendix 2 – Sample TPZ Fencing Sign.................................................................................... 21
Appendix 3 - Site Plan .................................................................................................................. 22
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Consult Arborist
1 B RI EF
This Tree Management Plan was commissioned by Stockwell Development Group Pty Ltd.,
in response to Noosa Council's decision notice conditions 31-34 concerning the Retention of
Existing Vegetation within the Covenant Area. Consult Arborist has been engaged to conduct
a Visual Tree Assessment along the southern edge of the Covenant Area within proximity to
the approved project design.
Tree protection guidelines have been provided to assist in reducing any conflict with the
protected existing vegetation.
2 S ITE I NSPECT ION
Matthew Duncan, the Director and Principal Arborist of Consult Arborist, undertook the Visual
Tree Assessment on the site from a ground level on Wednesday, 9 November 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 3: Overview area of the project site
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Consult Arborist 3 S COPE & L IMITA TIONS 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 Arb oricultural 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. 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. 22_11_21_TMP_Stockwell_Medihub Page 6 of 22
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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_11_21_TMP_Stockwell_Medihub Page 7 of 22
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4 S ITE F INDIN GS AN D O BSERVATION S
The site is located in the Noosa Council suburb of Noosaville and is currently a vacant plot of
land located on the edge of the Noosa Civic commercial retail complex.
Noosa Council has approved Stockwell to construct Medihub, a multi-level medical facility with
basement car parking. On the northern side of the site is a vegetation covenant area that
extends east parallel with Eenie Creek Road and behind the existing retail outlet buildings.
A survey of trees over 100mm in diameter was completed on trees along the south boundary
of the covenant. 13 trees were recorded over 100mm in diameter and within 2m, or TPZ radius,
of influence; the information is presented in the Tree Schedule and Tree Plot Plan.
On the southern side of the covenant area is a 3-4m wide strip of early mature and juvenile
trees with a natural understory that appears to have regrown naturally since the site was
originally cleared 20 years ago. The ground gives the impression of having been shaped into
a swale drain running east to west the length of the boundary. This strip of land and vegetation
is outside the covenant area and is proposed to be cleared to allow for site access and the
reconfiguration of the swale to create an overland stormwater flow.
Figure 4: Northern aspect of the site with the trees marked for removal within the swale.
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Consult Arborist
Figure 5: Plan extract from MPN Stormwater Treatment Plan stating Realign Existing Swale with batter
created to deepen the existing shallow swale drain
The creation of the Swale batter will directly conflict with the surface root of the surveyed trees
on the southern boundary of the covenant area.
Access to the swale area will also be required to assist with the construction of the building.
Site-specific tree and/or ground protection measures will need to be implemented to limit the
ground disturbance whilst fulfilling the approved project design.
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5 C OVENANT B OUNDA RY T R EE S CHEDUL E
TPZ SRZ
Botanical Common Height Spread @ Retention
ID# Age Health Structure (m) (m) Comments
Name Name (m) (m) 1.4m Status
(R) (R)
Corymbia Early
1 Bloodwood Good Good 12 6 0.34 4.1 2.3 Retain
species mature
A significant tree
Lophostemon Swamp Over
2 Fair Fair 12 6 0.65 7.8 3.0 Retain just inside the
suaveolens brushbox mature
covenant area.
Corymbia Early Just inside the
3 Bloodwood Good Good 10 4 0.25 3 2.0 Retain
species mature covenant area.
Corymbia Early On covenant
4 Bloodwood Good Good 10 6 0.25 3 2.0 Retain
species mature fence line.
Corymbia Early On covenant
5 Bloodwood Good Good 8 3 0.2 2.4 1.8 Retain
species mature fence line.
Eucalyptus Flooded Early Just inside the
6 Good Good 14 10 0.54 6.5 2.8 Retain
grandis gum mature covenant area.
Lophostemon Swamp Early Just inside the
7 Good Good 8 3 0.25 3 2.0 Retain
suaveolens brushbox mature covenant area.
Eucalyptus Forest Red Early 1m inside the
8 Good Good 10 3 0.25 3 2.0 Retain
tereticornis Gum mature covenant area.
Casuarina Early Just inside the
9 She oak Good Good 9 2 0.15 2 1.6 Retain
species mature covenant area.
Broad-
Melaleuca Early 1m inside
10 leaved Good Good 8 2 0.25 3 2.0 Retain
quinquenervia mature covenant area.
Paperbark
Three stems
Casuarina &
She oak & Early growing together
11 Melaleuca Good Good 8 2 0.25 3 2.0 Retain
Paperbark mature just inside the
species
covenant area.
Casuarina Early Just inside the
12 She oak Good Good 8 2 0.15 2 1.6 Retain
species mature covenant area.
Might be on the
Broad- road
Melaleuca Early
13 leaved Good Good 7 3 0.25 3 2.0 Retain reserve/corner of
quinquenervia mature
Paperbark the covenant
area.
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Consult Arborist 6 S ITE - SPECIFIC T R EE P RO TEC TION M EA SURES The protection of the trees should be undertaken during all stages of the project from the tree clearing and site establishment, throughout the main construction until completion. Tree Protection Zone fencing is to be erected prior to any works starting on site. This fence is to be star pickets and orange plastic mesh is to be erected along the southern boundary of the covenant area in accordance with Council approval conditions. The fencing is to be certified by the Project Arborist before works commence with a prestart held with the contractor. 6.1 SWALE With the requirement for the clearing of the trees within the swale area, all care is to be taken not to damage the protected trees. All tree removal is to be undertaken by hand with the use of chainsaws. Tree stumps are to be ground and not ripped out of the ground, so as not to disturb the ground in which the protected trees would have root systems growing. The swale area is then to be covered with thick Geofab 8-10mm and then a ground protection material such as either 200-300mm of forest mulch or some kind of rubber/plastic matting. The aim of this ground protection is to allow access to the area whilst protecting the roots in the ground. On completion of the main building construction works where access in this area is needed the ground protection measures can be carefully removed. It is acknowledged that a functional swale drain is required to be constructed which will require the creation of battered sides. The greater the earthworks that occur closer to the protected trees the greater the risk of damaging the trees and the forfeit of the monetary bond. The details of the creation of the swale should be worked out on site with the team and the Project Arborist to determine how this is created and what exactly the final design would look like. Due to the limited access available for machinery, and only with the use of temporary ground protection, a combination of a mini-digger and a Hydro-vac excavator is suggested as a method to undertake any excavation to create the swale, with the Project Arborist overseeing the works. On completion of the build, the TPZ area is to be included in the soft landscaping plan. No structure or services are to be installed within the area. Tree protection measures are to be carefully removed under the guidance of the Project Arborist and the area is handed over to the landscaper to complete any rectification works to the swale as per the approved landscape plan. 22_11_21_TMP_Stockwell_Medihub Page 11 of 22
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Consult Arborist 6.2 SITE / TPZ – EXCLUSION ZONE PLAN Figure 6: Existing plan extract adapted to illustrate the location of the subject trees and Tree Protection Area • Figure 6 is the existing plan extract illustrated to show the indicative Tree Protection Area (red dotted line) that is to be protected and managed as per tree protection measures specified within this report. • All staff on site are to be made aware of the Tree Protection Area. • The Site Foreman is to take responsibility for its protection daily • The Tree Protection Area is aimed at protecting the root systems of the trees deemed to be retained. • Access beneath the trees is not permitted for any construction activity, or storage, without prior agreement with the Project Arborist and the site foreman • All site activities within the Tree Protection Area are to be discussed and agreed upon with the Project Arborist, supervision may be required. • All excavation works within the Tree Protection Area are to be supervised by the Project Arborist. • Tree Protection fencing will be required and maintained during the life of the project. 22_11_21_TMP_Stockwell_Medihub Page 12 of 22
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Consult Arborist
6.3 TREE PROTECTION FENCING (TPF)
TPZ fencing may consist of 1m high plastic orange mesh barrier fencing or a double row of
flagging with star pickets with end caps as support, spaced at 4 – 5m and attached with zip
ties. This style of fencing is deemed suitable for larger sites when work activities are generally
to be within the central area of the site with the proposed retained trees are on the periphery
and away from main site activities.
Figure 7: Exclusion Zone fencing
Figure 8: Fauna-friendly exclusion zone fencing
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Consult Arborist 7 T REE P RO TECT ION G UID ELINES For the proposed retention of the trees onsite, 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. 7.1 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_11_21_TMP_Stockwell_Medihub Page 14 of 22
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7.2 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.
7.2.1 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.
7.2.2 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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7.3 ESTABLISHING TREE PROTECTION
Figure 9 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 9: Example of an ideal generic Tree Protection System
7.4 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.
7.5 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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7.6 RESTRICTED ACTIVITIES WITHIN THE TPZ
Restricted activities within the TPZ that would cause harm to the retained trees to 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.
7.7 TPZ STANDARD MITIGATION MEASURES
Remediation measures can be undertaken to limit and reduce any negative effects that may
occur. Where suitable the retained trees’ TPZ areas are to be improved to provide a more
favourable and beneficial growing environment for the tree’s roots and will in turn benefit the
plant’s health, safety, and the amenity that it provides and can be incorporated with the project
landscaping details.
Where the soil levels are required to be raised a sandy loam is to be us ed. This will improve
drainage and allow for gaseous exchange. Trees can adapt to low levels of Fill being placed
over the existing ground if undertaken with the correct material. In some cases, this additional
medium can also provide ideal rooting conditions for feeder roots and a beneficial food source
for the tree.
The following mitigation measures and procedures should be implemented where deemed
appropriate by the Project Arborist who should advise and oversee all mitigation works.
• Where possible 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.
• Ground protection measures are to be installed/used 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.
• Apply a seaweed-based soil conditioner/plant food to the topsoil as per the manufacturer’s
guidelines; monthly applications are recommended for the duration of the project.
• When required supplemental watering with a water cart or sprinkler system can be used
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
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8 G ENERAL E XCAVA TION M ETHOD OLOG IES
Details below give examples of works methodology to excavate a trench or general excavation
when working in proximity to trees.
When using a mechanical excavator ground protection is advisable to minimise compaction
and damage to the surrounding soil and roots. With a combination of a small buck et and ripper,
the spoil from the trench can be carefully extracted. General excavation is to be undertaken ,
when possible, with the bucket positioned perpendicular to the tree, and the spoil dug away
from the tree, this helps to minimise roots being accidentally torn or fractured.
When excavations are being undertaken within a tree's root zone, all necessary precautions
are to be adhered to. The Project Arborist will advise on the progression of the works and
undertake root pruning as required.
Roots deemed to be pruned and removed are to be carefully cut using a sharp saw and/or
secateurs. Root removal is carried out by the Project Arborist on a root-by-root basis taking
into consideration the type of tree, distance from the cut to the tree, and the size and number
of roots found.
Where possible trenches and excavations are to be carefully backfilled using topsoil from the
site or imported topsoil with a low organic matter content and lightly compacted by hand within
the tree zone. Ideally, the ground is then irrigated to increase moisture in the soil (not
waterlogged) and where possible 100mm of mulch is spread to cover the surface area.
Where possible create a preliminary trench/excavation at the outer edges of the required cut
line using a Hydro-vacuum excavator. Roots found can be cleanly cut by the Project Arborist.
Once the preliminary cut line is completed excavation of the remaining area outside the cut
line can be dug using the appropriate excavator with all due care and attention to the adjacent
protected trees.
Figure 10: Example of preliminary trench/excavation cuts
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9 R EFERENC ES :
• 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.
10 A SSU MPTIONS 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 (Stockwell).
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 y ou 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 indirect ly,
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 9/11/2022 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 quest ion
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 P ty
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_11_21_TMP_Stockwell_Medihub Page 19 of 22
Page 20
Consult Arborist
A PPENDIX 1 - D EFINITION OF T ER MS
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: Diameter at Breast Height - The approximate diameter of the trunk is measured visually in
millimetres at a height of 1.4m.
SRZ: The Tree Protection Zone, as per AS 4970-2009 Protection of trees on development sites, 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 Structural Root Zone
(SRZ).
The radius of the TPZ = DBH x 12
A TPZ should not be less than 2m or greater than 15m (unless crown protection is required).
DBH: The Structural Root Zone, as per AS 4970-2009 Protection of trees on development sites, 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 major encroachment into a TPZ is proposed.
22_11_21_TMP_Stockwell_Medihub Page 20 of 22
Page 21
Consult Arborist A PPENDIX 2 – S A MPL E T PZ F ENCING S IGN 22_11_21_TMP_Stockwell_Medihub Page 21 of 22
Page 22
APPENDIX 3 - SITE PLAN
Consult Arborist
14°17'35"/ pp
10.356 we
Et Boge
Mf
349°31'10"
8.39
\
Date : 18-11-2022
x
3555545" \ Drafted By: DJC
464 Surveyed: DJC
4°32'45"
WARNING NOTES 7464 | Checked By : ACC
Boundaries
The boundaries on this plan have been plotted from & DUNS Here: AUDOTON-O1 seth
deed dimensions only, and were not reinstated or
marked at the time of survey. ge ae SEES
Services Sheet Size: A3
The services on this plan have been derived by survey and ) /
compiled from existing records. The position of services 12d File Ref : AUO07281-60
labelled “plotted from records” is approximate only and 1311"45"
subject to confirmation by further investigation. Before the 7.464 Level Datum : AHD Der
commencement of any construction works, the location of ff
all services must be verified on site by the relevant > Origin: Vide Supplied
authorities. > H Survey Control
Symbols
The shapes depicting services are symbolic representations, RY ir
and whilst they are accurately positioned, they are not to
scale. é tr | CLIENT
Trees + |. ‘KWE!
The trees shown on this plan are a representation of the significant z= 4 it +9 eprezZZ01, ou STOC: LL
trees at the time of the survey. The extent of this information PROJECT
should be verified by relevant parties. The type and significance of i
the trees shown should be confirmed. The symbols and dimensions Medihub
shown are indicative only. Noosaville
© = Diameter of Trunk
Spread of Foliage 315°15'20" 1 Detail and Contour Survey
H = Height of Tree 7 10.378 SP322201 Over Lot 22 on SP322201
Hofmann Drive, Noosaville
“| O Local Authority
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10.378 Noosa Shire Council
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RPS Austraia East Pty Lid
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‘ABN 44 140 202 762
SYMBOLS 1 Innovation Parioway, Birtinya, Qld, 4575
pero ior PO BOK 6149, Meridan Plains, Old, 4551
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22_11_21_TMP_Stockwell_Medihub
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