Approved Plans OPW19 0180 · OPW19/0180

Page 2

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APPROVED PLANS
   OPW19/0180
 NOOSA COUNCIL
    21/10/2019
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[OCR of page images]
 

ARBORIST

REPORT

Project Address: 19 Viewland Drive

Noosa Heads, QLD, 4567
Property Description: Lot 8 RP 88535
Application Number: OPW19/0052
Commissioned by: . Mr Ron O'Grady
Date: 19/03/2019

Prepared by:

Mfr

Matthew Duncan
Director / Principal Arborist

e: [email protected]
m: 0450 355 770

 

ABN: 68 153 548 531

 

APPROVED PLANS
OPW19/0180
NOOSA COUNCIL
21/10/2019

TODAY’S TREES FOR TOMORROW

 

 

 

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This document was prepared for the sole use of Mr R O’Grady 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 Mr R O'Grady.

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 to reduce any potential risk they may
pose.

COPYRIGHT

This report/document is subject to copyright laws and penalties @280c per word per incident,
no part 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:
1. Customer permission: No more than three hard copies to exist at any one time.
2. Customer email permissions: Must be original PDF format and limited to agreed
Parties with direct and vested interest in the case.

DOCUMENT CONTROL

The latest approved version of this 19_03_19_ArbRep_O'Grady_19 Viewland Drive 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.

All individuals working near protected trees are to be made aware of this document and it is
the responsibility of the individual to implement and/or adhere to the recommendations and
guidelines.

1 (one) 19/03/2019 MJD SCD MJD

DOCUMENTS REVIEWED

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

 

 

 

 

 

 

5/03/2019 20190005 - NSC RFI Tree Clearing Application

25/02/2019 Stage 9 Plans 19 Viewland Drive
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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TABLE OF CONTENTS

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Document Control

 

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2 Site Inspection

 

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3:1 Site Overview Google Map :ieizscissexsessasersiacsanccsceaanseanessisssiss ROAR santneace 5

4: Executive Summeatty ccsissssssssassrevvassexsssesnvcseiasansenenanesesiusarseagaesceasnenreneneeseaneonensnenenconconsrse 6

GB: SCOPE ANG, UIMMAU CASH cesar sssesnesconceacsccenenscunsuoavrew aesnavasse vec eeersenesesu nee SSy TUE UN TIOSORANEE 7

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8 Detailed Tree Findings ..............c.eccccccccsecsnesseeseseeseeseeesesssenecsecsenensesessavsesesseessecseeaeers 10
8.1 Tree#1.

  
 

8.2 Tree#2.

 

8.3

8.4

8.5

8.6

8.7

8.8
9 General Tree Protection Procedures viiisscassiiscsrscciveecsvescevecnevescsesuenonrraniTeTeevaMiedaeeTty 13
10 RefErEN CES: oo... ccc eccceecreeneesenseneeseeseetecaeesseecsecsenesseneetsuesieeienesiensenssatieneeeereseenaenes 14
11 Assumptions:and Disclalmer ccscssssssviccsesceusssesnseenmmanassrisacaneansamnencannnnyines 14
Appendix 1 - Definition Of Terms ...........ccccccceeeeeeseeseeeseesesseseesesesecseesesecsecseeeseetecessenaeees 15
Appendix 2 — Tree Risk Assessment Methodology ..............:::::ccsesescsesseseerseseeneneeneeneeeeee 16
Appendix S = Definition icf ISA. Terms esisziswssnernesseccuneaeusersororenmavercrrrereceuuaaviveevonensiey 16
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1 BRIEF

This assessment has been commissioned by Mr R O’Grady. Consult Arborist Pty Ltd has been
requested to conduct an Arborist Report for trees located at, and adjacent to, the site of 19
Viewland Drive, Noosa Heads, with consideration to the planned renovation of the existing
dwelling and the relocation of the driveway access.

This report is to fulfil a request for further information from Noosa Council -

The information requested is set out below:
Issue

Insufficient Information supplied for the removal of the vegetation as the trees appeared to be
healthy at the time of inspection.

Information Required

1. Provide a completed Tree Risk Assessment Form by a person with ISA Tree Risk
assessment qualification for the tree subject to the permit application and also include any
supporting information.

2 SITE INSPECTION

Matthew Duncan, Director and Principal Arborist of Consult Arborist, undertook the Visual
Tree Assessment of the site which was completed from a ground level on Wednesday, 13
March 2019. Matthew holds an AQF Level 5 (AHC50510) Diploma in Arboriculture from
Sunshine Coast TAFE, an International Society of Arboriculture’s Tree Risk Assessment
Qualification 2015 and has worked in the arboricultural industry since 1994. For the past 7
years, Consult Arborist has been engaged to provide arboricultural advice and guidance on
civil and capital works projects from cross-sector clients throughout SEQ.

3 SITE LOCATION AND DETAILS

The site at 19 Viewland Dive is located within the Noosa Council residential suburb of Noosa
Heads. The proposed renovation of the dwelling includes the relocation of the driveway and
landscaping and directly conflicts with existing trees. A number of the trees on site will be
within 3m of the renovated dwelling and as such are permit exempt from Noosa Council. These
trees have been included to provide transparency for the application.

The predominant trees within the front garden are mature Bribie Island Pines and a Pink
Bloodwood. To the rear of the property there is an early mature Cadaghi, a group of Brush
box stems, a self-seeded Wattle and a clump of Fraser Island Apple.

Located within the proposed new alignment of the driveway is a Tuckeroo that was planted
between the kerb and footpath by Noosa Council as part of the streetscape.

 

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3.1. SITE OVERVIEW GOOGLE MAP

 

Figure 2: Site plan with subject trees indicated

 

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4 EXECUTIVE SUMMARY

It is proposed that at the front of the property 5 of the 7 Bribe Island Pines are removed due
to design conflict. The remaining two Bribe Island Pines will be retained on the front
boundary/edge of the road reserve.

The Bloodwood requires removal on the grounds of health and safety.

To the rear of the property the Cadaghi and Wattle are to be removed under the NC
exemptions with the remaining vegetation to be assessed as the renovation progresses and
retained or removed as required. The Brush Box and Fraser island Apple trees/stems are
exempt from requiring permission due to their position adjacent to boundary fences,
neighbouring structures and the completed renovation.

Consent from Noosa Council is sought to remove and replace the Tuckeroo street tree to
facilitate the driveway cross-over.

 

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5 SCOPE AND LIMITATIONS

The purpose of this report is to provide clarity, advice and guidance for the existing trees within
the site that form part of the application and effected by the proposed renovation.

Consult Arborist has reviewed the supplied documentation/plans relating to the site and
reviewed them in relation to the existing trees/vegetation and the site taking into consideration
the design, future use and buildability of the Project. This report aims to provide guidance and
direction with the practical consideration of the retention and removal of trees on site.

This report is guided by the AS4970-2009 Protection of trees on development sites and the
ISA Tree Risk Assessment. The subject trees as detailed within the report that are deemed
to be affected by the proposed development received an assessment guided by International
Society of Arboriculture (ISA) Basic Level 2 assessment with consideration to the design and
future use of the project.

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.

This report does not take into consideration extreme weather events or future pest and disease
outbreak which may affect the tree’s health, condition and retainability.

All assessments of the retained trees have been made visually and include the use of basic
tools and techniques, i.e. cavity probing, minor root collar excavation, measuring tapes and
devices and photography to gather information. No additional specialist equipment was used
and no conclusive comments on what may have or may be happening within the internal
structure of the tree will be made. No tissue or soil samples have been collected or submitted
for testing.

The information contained in this report is based on a visual inspection of the palms/trees and
their locations, species, health and condition at the time of inspection. The additional
information provided is the author’s opinion and is a ‘snapshot in time’ of the specific trees’
health and condition at the time of the quoted inspection and no guarantee can be given that
faults or issues may not arise in the future.

 

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oO
n

 

Picture 1: Frontage of 19 Viewland Drive

 

Picture 1: Rear of 19 Viewland Drive

 

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7 TREE SCHEDULE

Consult Arborist

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Encroachment over
Front Corymbia Pink 500- the dwelling due to
4 Garten iitermadia Bloddwend 10-12 8-10 600 66 Mature Fair Poor Moderate No Remove past overhead power
line pruning.
Two trunks.
mo Project design and
2| fom | came | Brmeisend) es | ae | 0° 4? | mone | irae | cae Low Yes | Remove | construction conflict.
Garden | columellaris Pine 400
Permit exempt within
3m.
Front Callitris Bribie Island 400- . Project design and
3 pater Blumiataite Pine 12-14 6-8 500 5.4 Mature Good Fair Low Yes Remove construction conflict
Front Callitris Bribie Island 200- Project design and
4 Garden columeliaris Pine &8 48 300 8 Meture Good Flr How Yes Remove | construction conflict
Rear Corymbia 4 300- Early- Weed.
5 | Garden | torelliana Redaoh: | 8 || Ee | foo | 4% | inane | SOO | \Good Low Yes | Remove | permit exempt
Rear 200- Early- , Permit exempt within
6 Garden Acacia sp. Wattle 5-6 2-3 300 3 fale Fair Fair Low Yes Remove an
NC Road | Cupaniopsis . . Project design and
mt Reserve | anacardioides Tuckeroo 2-3 1-2 0-100 2 Young Fair Fair Low Yes Remove construction conflict.
“All measurements are in metres and measured with a combination of diameter tape and visually by eye
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8 DETAILED TREE FINDINGS

8.1 TREE #1

A mature Pink Bloodwood located beneath overhead power lines. The trunk of the tree is
located adjacent to the front property boundary. Due to the past pruning regime over many
years by Energex the tree's canopy now significantly favours the direction of the dwelling. It is
uncertain if the trunk has moved in the past, but the tree does have a predisposed lean and
failure direction towards the dwelling. While the tree will not be directly affected by the
proposed renovation it does pose a threat to the dwelling.

Current Risk Rating

 

Likelihood of Failure Likelihood of impacting target
Possible High

Matrix Table 1 — Likelihood Matrix Consequences of failure
Somewhat Likely Severe

Matrix Table 2 and final Risk Score MODERATE

 

 

 

 

 

 

 

 

Hazard mitigation works - proactive removal.

Requested Outcome — Removal

8.2 TREE #2

A mature twin trunk Bribie Island Pine with a suppressed form resulting in a reduced structural
condition. The tree is located within the proposed front landscaping earthworks area where
the works will result in 300-400mm of Fill being placed over the tree's root system and a rock
retaining wall being constructed on the western side with continuation of the Fill on the eastern
side. This is likely to lead to the tree's decline and accelerated mortality.

Currently Risk Rating

 

 

 

 

 

 

Likelihood of Failure Likelihood of impacting target
Improbable Low

Matrix Table 1 — Likelihood Matrix Consequences of failure
Unlikely Minor

Matrix Table 2 and final Risk Score LOW

 

 

 

Renovation works conflict with the tree.

Requested Outcome — Removal

 

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8.3 TREE #3

A mature Bribie Island Pine centrally located within the front garden. The proposed new
driveway alignment will directly conflict with the tree’s location.

 

 

 

 

 

Current Risk Rating
Likelihood of Failure Likelihood of impacting target
Improbable Medium
Matrix Table 1 — Likelihood Matrix Consequences of failure
Unlikely Severe
Matrix Table 2 and final Risk Score LOW

 

 

 

 

Renovation works conflict with the tree.

Requested Outcome — Removal

8.4 TREE #4

A mature Bribie Island Pine positioned beneath tree 3 resulting in a suppressed form. The tree
is positioned within 3m of the eastern property boundary and within the proposed new
driveway alignment.

 

 

 

 

 

Current Risk Rating
Likelihood of Failure Likelihood of impacting target
Improbable Low
Matrix Table 1 — Likelihood Matrix Consequences of failure
Unlikely Minor
Matrix Table 2 and final Risk Score LOW

 

 

 

 

Renovation works conflict with tree

Requested Outcome — Removal

8.5 TREE #5

An early-mature Cadaghi sited in the rear garden. Permit exempt - listed as an 'Undesirable
Plant Species".

Requested Outcome — Removal

8.6 TREE #6

An early-mature Wattle located adjacent to the rear property boundary and within 3m of the
existing dwelling. Permit exempt due to location and age.

Requested Outcome — Removal

 

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8.7 TREE #7

Planted establishing Tuckeroo street tree within the Noosa Council road reserve. The position
of the tree is in direct conflict with the proposed driveway crossover.

 

 

 

 

 

Risk Rating
Likelihood of Failure Likelihood of impacting target
Improbable Very Low
Matrix Table 1 — Likelihood Matrix Consequences of failure
Unlikely Negligible
Matrix Table 2 and final Risk Score LOW

 

 

 

 

Renovation works conflict with the tree.

Requested Outcome — Removal and replacement

8.8 RETAINED TREES

Two mature but supressed Bribie Island Pines are proposed to be retained within the front of
the property. Both trees have asymmetrical canopies that favour the road reserve. Their
retention will help to retain some of the treescape to the road frontage.

Tree protection measures will need to be undertaken to prevent detrimental harm to the tree
root systems during the proposed renovation and driveway works. These Tree Protection
Measures can be guided by AS4970-2009 Protection of trees on development sites and
generally aim to protect the root systems of retained trees by exclusion and prevention of
damage. It is recommended that there TPZ areas are fencing and the area beneath them
mulched to help retain moisture in the soil. NO construction, access or storage of site materials
is to occur within the retained trees TPZ areas.

Requested Outcome -— Retain

 

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9 GENERAL TREE PROTECTION PR

All trees or groups of trees specified or shown to be retained are to be protected from damage
with temporary fencing as specified in AS 4970-2009 Protection of Trees on Development
Sites and in the Arborist’s report. Temporary fencing must be erected at the boundary of the
TPZ marked areas must be installed in accordance with AS4970 prior to works commencing.

All Works within a designated TPZ of retained vegetation must be supervised by the Project
Arborist (AQF Level 5). Take all necessary precautions, including but not limited to the
following:

e Appropriate signage i.e. ‘Tree Protection Zone’ and ‘No Go Zone’ must be erected at the
boundary of TPZ to prevent vehicles from entering and prevent stockpiling occurring near
retained trees / vegetation;

e No damage to be caused to tree trunks and bark (i.e. do not attach guides or stays to
trees / vegetation);

e Noexcavation works / open trenching to encroach within the TPZ of retained trees unless
under the direct supervision of Project Arborist;

e Where necessary to cut roots, this shall be undertaken by the Project Arborist;

e No storage or otherwise placing of spoil, bulk or potentially harmful materials (i.e.
construction refuse, concrete waste, herbicides, diesel, etc.) under or within 1 m of TPZs.
Prevent windblown materials such as cement from harming trees and plants;

e Avoid ground compaction under trees. If compaction occurs (i.e. from site access or the
location of a construction plant or vehicle parking) notify the Project Arborist and obtain
their instructions;

e Ground Protection: Where construction encroaches into the TPZ of trees to be retained it
shall be necessary to install protection to avoid compaction of the ground surface, lateral
and absorbing roots;

e Any damage to trees during works is to be rectified according to AS 4373/96 Pruning of
Amenity Trees and best horticultural practices. The Project Arborist must oversee works,
and

Where deemed beneficial mulch entire ground surface within TPZ with Forest Blend Organic
Mulch or site mulch to a depth of 100mm and install a temporary irrigation system or manually
water to ensure that soil moisture levels are adequately maintained.

 

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10 REFERENCES:

Australian Standards ® AS 4970 — 2009 Protection of trees on Development Sites

Australian Standards ® AS 4373 — 2007 Pruning of amenity trees AS 4373—2007.

Wild Plants of Greater Brisbane —- Queensland Museum

ISA Tree Risk Assessment

ACA, STARS

Evaluating Tree Defects — A Field Guide by Ed Hayes, Second Edition

Body Language of Trees - Research for Amenity Trees, Claus Mattheck

Smiley E. Thomas, Nelda Matheny and Sharon Lilly April 2012. Tree Risk Assessment: Levels of Assessment

11 ASSUMPTIONS AND DISCLAIMER

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 (Mr Ron O'Grady).

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 13/03/2019 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, sight lines, landlord-tenant
matters and related. Consult Arborist Pty Ltd cannot take such issues into account unless the 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.

 

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APPENDIX 2 — TREE RISK ASSESSMENT METHODOLOGY

The methodology of rating risk used in this report is based on the following International Society of Arboriculture’s Tree Risk
Assessment and is calculated through the use of qualitative risk matrix tables.

Initially the Likelihood Matrix is used to estimate how likely a failure will be to impact a target. This is calculated by categorising
how likely failure is to occur and combining that with how likely that failure is to impact a target, as per Table 1.

1- Matrix

imminent

Possible
Im,

   

= toa target

Once the Likelihood of Failure & Impact level is determined a final level of Risk Rating can be calculated by combining the
Likelihood with the Consequences of Failure for each identified risk. This ascertains an overall Risk Rating for the tree, determined
in Table 2.

Low
Low Moderate
Low Low

 

2 =
Where multiple risks are noted these tables will be used for each risk and the highest level will be taken as the overall risk rating

for the tree. In this scenario multiple mitigation options may be offered to the tree manager to return the risk to an acceptable
level within a reasonable timeframe as guided in Risk Rating.

APPENDIX 3 - DEFINITION OF ISA TERMS

Improbable: | The tree or branch is not likely to fail during normal weather conditions and may not fail in many severe weather
conditions within the specified time frame.

 

 

 

Possible: Failure could occur, but it is unlikely during normal weather conditions within the specified time frame.
Probable: Failure may be expected under normal weather conditions within the specified time frame.
Imminent: Failure has started or is most likely to occur in the near future, even if there is no significant wind or increased load.
ps is an infrequent occurrence for a risk assessor to encounter and may require immediate action to protect people
m_ harm.

Very low: The likely hood of the failed tree or part impacting the specified target is remote. Occupancy rates are rare with no
protection or occasional with moderate protection.

 

 

 

Low: It is not likely that the failure will impact the target. The occupancy rates are frequent with partial protection or
constant with significant protection.

Medium: The failure is as likely as not to impact the target. The occupancy rates frequent with single side exposure or constant
with partial protection.

High: The failure is most likely to im the target. ion is constant with no protection.

Constant: 24 hours a day, 7 days a week.
Frequent: A large portion of the day / week.
Occasional: | The zone is occupied by people or targets infrequently or irregularly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rare: Not commonly used.

Negligible: Low-value property damage or disruption that can be replaced or repaired, no personal injury.

Minor: Low to moderate property damage, small disruptions to traffic or infrastructure, or very minor injury to persons.

Significant: | Property damage of moderate to high value, considerable disruption, or personal injury.

Severe: Serious personal injury or death, damage to high-value or disruption of important activities.

Extreme: Failure is imminent with a high likelihood of impacting the target, and the consequences are severe.

High: Failure is very likely or likely with significant consequences, or failure is likely with severe consequences.

Moderate: Failure is very likely or likely with minor consequences, or failure is somewhat likely with significant or severe

consequences.

Low: Failure is unlikely with negligible consequences or failure is somewhat likely with minor consequences.

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APPENDIX 1 - DEFINITION OF TERMS

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.
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.
Tree with advanced retrenchment, a reduced crown size and annual increment growth, extensive hollowing, crown collapse, low
vigour, advance heartwood decay, advanced colonisation by fauna and flora.

 

 
   

Veteran:

      
  

 

 

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 deadwood within what can be an unbalanced canopy, foliage generally
with good colour although some discoloration 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 further decline of the tree. Detrimental pathogen damage.

Dead: Dead or dysfunctional moribund tree.

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 major defect that may fail at any time

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 development site. The TPZ is a combination of the root and crown area fequiring 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 ximate diameter of the trunk is measured visually in millimetres at a height of 1.4m.

Low Low risk potential / proactive management Within 12 months

Moderate Medium risk potential / reactive management Within 6 months

High High risk potential / reactive management Within 30 days”

Severe Severe risk potential / Risk management ASAP - Urgent
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Document Set ID: 20954104
Version: 1, Version Date: 23/08/2019