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Arborist Report · 132007.616.05
Attached to the e-mail Response to further information request - 132007.616.05.
Consult Arborist Pty Ltd
PRELIMINARY
ARBORICULTURAL
IMPACT ASSESSMENT
Project Address: 8 Attunga Heights,
Noosa Heads, QLD, 4567
Property Description: 23 RP89506
Commissioned by: Tike Property Pty Ltd
Date: 11/09/2018
Prepared by:
Matthew Duncan
Director / Principal Arborist
e: [email protected]
m: 0450 355 770
ABN: 68 153 548 531
TODAY’S TREES FOR TOMORROW
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Consult Arborist
This document was prepared for the sole use of Tike Property 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 Tike Property.
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.
C OPYRIGHT
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.
D OCUMENT C ONTROL
The latest approved version of this 18_09_11_PAIA_Tike_8 Attunga Heights_V2 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.
Version Date Written Reviewed Approved
1 (one) 7/09/2018 MJD SCD MJD
2 (two) 11/09/2018 MJD SCD MJD
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Consult Arborist
T ABLE OF C ONTENTS
Copyright .............................................................................................................................. 2
Document Control ................................................................................................................. 2
1 Brief ............................................................................................................................... 4
2 Site Inspection ............................................................................................................... 4
3 Site Location and Details: .............................................................................................. 4
3.1 Site Overview Google Map ..................................................................................... 5
4 Scope and Limitations .................................................................................................... 6
5 Site Plan ........................................................................................................................ 7
6 Tree Schedule ............................................................................................................... 8
7 Finding from Tree Schedule ......................................................................................... 10
7.1 Tree #1 - #3 .......................................................................................................... 10
7.2 Neighbouring Ribbonwood .................................................................................... 12
7.3 Trees #4 and #5.................................................................................................... 13
7.4 Noosa Council Road Reserve ............................................................................... 14
8 Conclusion ................................................................................................................... 15
9 References: ................................................................................................................. 16
10 Documents Reviewed............................................................................................... 16
11 Assumptions and Disclaimer .................................................................................... 17
Appendix 1 - Definition of Terms ......................................................................................... 18
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Consult Arborist 1 B RIEF This assessment has been commissioned by Tim McGary, Tike Property Pty Ltd. Consult Arborist Pty Ltd has been requested to conduct a Preliminary Arboricultural Impact Assessment of trees located at and adjacent the site of 8 Attunga Heights, Noosa Heads, with consideration of the planned redevelopment of the site. 2 S ITE I NSPECTION 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, 15 August 2018. 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 S ITE L OC ATION AND D ETAI LS : The site at 8 Attunga Heights is located within the Noosa Council residential suburb of Noosa Heads. Existing dwellings in the area are being redeveloped over time to replace the 70’s and 80’s properties with modern multi-occupancy or high-end housing. The site is currently occupied by a typical 1980’s detached house which sits centrally on the site. The site is on a slight slope which angles from the back of the site to the road frontage. To utilise the maximum potential of the site a semi-detached townhouse configuration is proposed with the lower ground floor being dug into the natural slope of the site. The existing treescape consists of two Bribie Island Pines, a Brush box and Golden cane plants at the rear of the site. Further Golden canes, a Lilly Pilly and a Bribie Island Pine are in the front north-west corner. An old feature Pandanus that is past its best is located towards the front of the site next to the existing driveway. The two main feature trees of the site are located on Noosa Council road reserve are Bribe Island Pines with a number of weed or undesirable species forming an understory. Adjacent the boundary at the rear of the site in the neighbouring properties are three mature Bribie Island Pines. These trees have been taken into consideration with the updated Project Design that is aimed at minimising the impact on their locations while integrating them into the overall design. Comment and guidance will be provided on the subject trees and their suitability for retention within the currently proposed project design. 18_09_11_PAIA_Tike_8 Attunga Heights_V2 Page 4 of 18
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Consult Arborist
3.1 SITE OVERVIEW GOOGLE MAP
Figure 1: Google map overview of the site and surrounding area
Figure 2: Site plan with subject trees indicated
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Consult Arborist 4 S COPE AND L IMI TATIO NS The purpose of this report is to provide clarity, advice and guidance for the existing trees within the site that have previously been surveyed but not catalogued. Consult Arborist has reviewed the supplied documentation relating to the site, the existing trees/vegetation and the site layout taking into consideration the design, future use and buildability of the Project. This PAIA report aims to provide guidance and direction with the practical consideration of the retention and removal of trees on site and within the adjacent properties. This Preliminary Arboricultural Impact Appraisal is guided by the AS4970-2009 Protection of trees on development sites. The subject trees as detailed within the report that are deemed to be affected by the proposed development received an 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. 18_09_11_PAIA_Tike_8 Attunga Heights_V2 Page 6 of 18
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Consult Arborist
5 S ITE P L AN
The following figure 3 shows a plan extract positioned approximately over the existing site.
Figure 3: Shows the subject trees on an existing site plan
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Consult Arborist
6 T REE S CHEDULE
Common Crown Retention Design Remove/
Id Location Botanical Name Height DBH TPZ Age Health Structure Comments
Name Spread Value Conflict Retain
Rear Callitris Bribie 400- Project Design and
1 12-14 6-8 5.4 Mature Good Fair Low Yes Remove
Garden columellaris Island Pine 500 construction conflict
Rear Lophostemon 300- 4.2 Early Project Design and
2 Brush Box 10-12 4-6 Fair Fair Low Yes Remove
Garden confertus 400 Mature construction conflict
Rear Callitris Bribie 300- Early Project Design and
3 10-12 4-6 4.2 Good Fair Low Yes Remove
Garden columellaris Island Pine 400 Mature construction conflict
Front 200- Early Project Design and
4 Syzygium spp Lilly Pilly 4-6 4-6 3 Good Fair Low Yes Remove
side 300 mature construction conflict
Front Callitris Bribie 300- Early Project Design and
5 8-10 4-6 4.2 Good Good Low Yes Remove
side columellaris Island Pine 400 Mature construction conflict
Pandanus 300- Attempt to transplant to
6 Front Pandanus 3-4 2-3 4.2 Mature Fair Fair Low Yes Relocate
tectorius 400 adjacent garden bed
Two trunks forming one
entity.
NC Road Callitris Bribie 400-
7 8-10 6-8 5.4 Mature Fair Fair Medium Minor Retain Overhead power
Reserve columellaris Island Pine 500
resulting in canopy
pruning to the top
Overhead power
NC Road Callitris Bribie 400-
8 8-10 6-8 5.4 Mature Fair Fair Medium Minor Retain resulting in canopy
Reserve columellaris Island Pine 500
pruning to the top
*All measurements are in metres and measured with a combination of diameter tape and visually by eye
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Consult Arborist
Figure 3: Proposed site plan extract with indicative tree locations
Dark Green circles – neighbours' trees for retention
Light Green circles - Noosa Council trees for retention: #7 & #8
Yellow circle - tree to attempt transplant: #6
Red circles - trees to be removed due to project and construction conflict: #1, #2, #3, #4 & #5
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Consult Arborist 7 F INDI NG FROM T REE S CHEDULE 7.1 TREE #1 - #3 The original DA for the site indicated that trees in the rear garden of the site were to be retained, this included two Pines and a Eucalypt. As the approved DA from 2007 is now over ten years old, the trees originally conditioned for retention have grown considerably in size. At that time the trees may have been deemed acceptable for retention adjacent the completed project and capable of coping with the proximity of the works. Since then the approach to dealing with trees so close to higher density dwellings has changed and is not normally favoured due to a variety of factors including health and safety, physical damage and nuisance issues such as loss of light, debris in small garden spaces and guttering and the anxiety that can be fostered by having large trees so close to a dwelling. The Australian Standard, AS4970-2009 Protection of trees on development sites, was created to guide developers and arborists to ensure that adequate room is allocated for trees that are considered suitable for retention adjacent a new development. The past and current designs for 8 Attunga Heights both intrude into the designated retained trees' TPZs and with the construction phase taken into consideration, further encroachment would occur. Their designation for retention in 2007 would be revoked by the new standards in 2009. The 2007 DA approved the construction of a retaining wall along the eastern/rear boundary that would have resulted in major SRZ encroachment for all three trees, with potential direct conflict with tree #3. The construction of the approved design had not been taken into consideration and as such rendered the retention of tree #1-#3 untenable. The design of the project has been updated to suit current market trends but the constructability of the project is still a major factor. Having been advised that the site soil has a high sand content and that any excavation will result in “over dig”, adjacent trees need further consideration. "Over dig" is where the ground, and in this case, sand, falls into the hole as it is not self-supporting resulting in a larger/wider excavation. The creation of the lower ground floor to the back of the building and the building of a retaining wall will result in this occurring. This over dig will impact and compromise trees #1, #2 and #3. In addition to this, the design is proposing to install swimming pools in each garden. The size and current proposed located have been dictated to by the presence of trees within neighbouring properties and the requirement to avoid them. Having amended the pool locations, the functionality of the outdoor space was considered along with the necessity to reconstruct retaining walls and boundary fences that are currently in need of construction and/or replacement. These project considerations conflict with the trees #1, #2, and #3 and as such they are not deemed suitable for retention. As a means of replacing these large forestry style trees, deep planting areas have been planned with the intention of growing a green screen and replacing some of the lost vegetation with suitable and amenity enhancing landscaping. 18_09_11_PAIA_Tike_8 Attunga Heights_V2 Page 10 of 18
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Figure 4: Trees #1, #2 and #3 along the Figure 5: Canopy of Trees #1-#3
rear fence line
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Consult Arborist
7.2 NEIGHBOURING RIBBONWOOD
On the northern side of House B, the existing retaining wall between the site and the adjacent
property of 10 Attunga Heights is in a state of collapse, with timbers and support posts leaning
into the site. With the requirement for this structural wall replacement, there will be a need to
undertake civil works on the property boundary. An existing Ribbonwood, Euroschinus falcata,
within the neighbour's property is adjacent to the boundary line and may be contributing to the
decline in the structural condition of the fence. During these essential works, the tree's
retention in a suitable condition is the desired outcome. Ribbonwoods are described as
pioneer species that can establish with tolerance to environmental changes. The requirement
for root pruning to facilitate the construction of the retaining wall is not anticipated to cause the
tree's demise unless a direct conflict with the structural roots occurs. If direct conflict does
occur its removal will require further exploration.
Standing at a height of 6-8m, its height and failure potential after root disturbance is deemed
as improbable with only minor consequences. Canopy pruning to reduce the opposing weight
can be undertaken to lessen the load, whilst the root system responds and develops
reactive/responsive root growth.
Figure 6: Ribbonwood in 10 Attunga Figure 7: Collapsing retaining wall
Heights
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Consult Arborist
7.3 TREES #4 AND #5
The two trees located in the northeast corner of the site, #4 and #5, will both be impacted by
the replacement of the retaining wall and fence, with Tree #5 directly impacted by the
construction of the designed driveway access and concrete retaining wall that forms the edge
of the driveway for the sub-ground floor garage space.
The retention of tree #5 has been explored, but the site topography, construction requirements
and ground condition constraints make the tree's preservation impractical and if retention is
stipulated the works will conflict with over 40% of the tree's calculated TPZ and impacting the
SRZ on the site side increasing the likelihood of failure if not a steady decline in health.
Figure 8: Overview of trees #4 and #5 Figure 9: Base of tree #5
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Consult Arborist
7.4 NOOSA COUNCIL ROAD RESERVE
The Noosa Council road reserve is currently occupied by two Bribie Island Pines, Trees #7,
(two stems) and #8, an African tulip and range of understorey weeds and undesirable species
which detract from the feature Pine trees. The design of the road reserve and driveway access
has taken into consideration the two feature Bribie Island Pines. The presence of overhead
power has required the removal of some of the central branch canopy of these trees and as
such has reduced the trees' height and created a lower spreading branch habit. These species
are a common and themed tree in the streetscape and it is felt that their retention is a benefit
and asset to the frontage of the site and integrates the project into the street scene and local
area.
On reviewing the past Noosa Council stamped approved plans for this site, the twin stem tree
identified as tree #7 was deemed for removal due to the location of the driveway adjacent to
the southern boundary. The updated design of this project retains and protects this tree as
part of the existing streetscape.
It is proposed that the understory and weed species are removed with stumps carefully ground
out. The canopies of trees #7 and #8 require a lift prune to facilitate construction vehicles, but
these works will be kept to a minimum and guided by the Project Arborist.
As part of the landscaping and road reserve upgrade, works within the trees' TPZs is
unavoidable. These works are to be completed in a sensitive manner to minimise the impact
on the subject trees. Earthworks, driveway construction, service location and road reserve
upgrade will all be dictated to by the preservation of the trees. Mitigation and plant health care
protocol will be implemented to reduce the effects on the trees' long-term health and works
within the TPZs will be overseen by the Project Arborist.
Figure 10: Twin stemmed Tree #7 Figure 11: Tree #8 amidst weed and
undesirable species
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Consult Arborist
8 C ONCLUSION
This current design is supported by Consult Arborist as it takes into consideration the adjacent
vegetation within the neighbours’ properties, provides suitable deep planting opportunities for
the establishment of suburban treescape whilst preserving and acknowledging the existing
Noosa Council street trees, retaining the continuation of the street theme for all local residents
to enjoy.
Figure 12: Site overview
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Consult Arborist
9 R EFERENCES :
• 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
10 D OCUMENTS R EVI EWED
The following documents have been reviewed, analysed and referenced during the production
of this report.
Reference / Date Title / Details
7/09/2018 18020_20180907_8 ATTUNGA HTS NOOSA HEADS DA07
23/07/2018 8 Attunga Heights - Landscape Design for OPW - Issue C
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 11 A SSUMPTIONS AN D D ISCL AIM ER 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 (Tike Property Pty Ltd). 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 15/08/2018 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. 18_09_11_PAIA_Tike_8 Attunga Heights_V2 Page 17 of 18
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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, a reduced crown size and annual increment growth, extensive hollowing,
crown collapse, low vigour, advance 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 deadwood 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. The 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:
DBH: Diameter at Breast Height - The approximate diameter of the trunk is measured visually in millimetres at a
height of 1.4m.
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 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.
Tree Retention Value:
This retention value comes from the Institute of Australian Consulting Arborists (IACA), 2010, IACA Significance of a Tree,
Assessment Rating System (STARS), Institute of Australian Consulting Arboriculturists, Australia, www.iaca.org.au -
http://www.iaca.org.au/home/index.php/publications/71-stars
The process uses the Retention Value – Priority Matrix by assessing the Tree Significance Assessment Criteria and crossing
it with the Estimated Life Expectancy to determine the following ratings:
High: Priority for Retention
These trees are considered important for retention and should be retained and protected. Design
modification or relocation of building/s should be considered to accommodate the setbacks as prescribed by
the Australian Standard AS4970 Protection of trees on development sites. Tree sensitive construction
measures must be implemented e.g. pier and beam etc. if works are to proceed within the Tree Protection
Zone.
Medium: Consider for Retention
These trees may be retained and protected. These are considered less critical; however, their retention
should remain a priority with removal considered only if adversely affecting the proposed building/works and
all other alternatives have been considered and exhausted.
Low: Consider for Removal
These trees are not considered important for retention, nor require special works or design modification to
be implemented for their retention.
Remove: Priority for Removal
These trees are considered hazardous, or in irreversible decline, or weeds and should be removed
irrespective of development.
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