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REFERENCED DOCUMENT Arboricultural Tree Appraisal - REC13.0095 · REC13/0095
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ABN: 39019550176
Hanley Signata Pty Ltd Uas TREE FIX
p: 212 Wappa Falls Rd
Yandina QLD 4561
e :[email protected]
m: 0439724013
Arboricultural Tree Appraisal and
Retention Proposal
ReportlD 2130610
Site Address: 55 Lake MacDonald Dr Cooroy
(formally)
Commissioned by: Lex Toth
Callaghan & Toth
Civil, Environmental & Hydraulic Engineers
8/41 Sunshine Beach Rd, NOOSA HEADS
Phone: 54749081
Date of inspection: Wednesday, 30, May 2013
Design Reference Drawing reference numbers
Callaghan & Toth
1225-01
1225-02
1225-03
1225-21
Prepared by: Scott Hanley
Dip HortlArboriculture, MAA, MQAA
Director I Principal Arborist
TREE FIX
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Table of Contents
1. Report Request Brief: ....................................................................................................
5
2. Inspection Methodology Breit: .....................................
..............................
.....................5
3. Visual Tree Assessment as per lot Number. ..................................................................
7
3.1. Lot 1. (Draft 1225-02 lot 17) .....................................................................................
7
3.2. Lot 2. (Draft 1225-02 lot 18) .................................................................................
..13
3.3. Lot 3. (Draft 1225-02 lot 19) ................................................................................
..17
3.4. Lot 4. (Draft 1225-02 lot 20) .............................................................................
....20
3.5. Lot 11. (Draft 1225-02 lot 11) ...............................................................................
..23
3.6. Open Space, Storm Water Line and Storm Water Bio Retention........... .................26
(Draft 1225-02 Parallel to Lot 4 and lot 11).......................................................................26
3.7. Lot 5. Wilgee Court (Draft 1225-21 lot 5)................................................. ...........
....28
3.8. Lot 6. Wilgee Court (Draft 1225-21 lot 6).. .............................................................
.30
3.9. Lot 7. Wilgee Court (Draft 1225-21 lot 7)................................................................32
4. Tree Protection Management Proposal: .......................................................................
37
4.1. Site Induction & Awareness Briefings....... .........................................................
.....37
4.2. Tree ProtecUon Zone Marking, Fencing and Signage Needs .................................37
4.3. TPZ and SRZ calculations...... .......................................................
........................37
4.4. During Construction Access...................................................................................37
4.5. Vehicle & Machinery Working Under Trees....................... ..................................
...38
4.6. Mulching. .................................................
.....................................................
.........38
4.7. Tree Canopy Pruning............................................................................................. 38
4.8. Excavation management within TPZ......................................................................38
4.9. Ground/Root Protection .........................................................................................38
4.10. Root Protection...................................................................................................38
4.11. Modification of Soil Levels ...............................................................
..................
.38
4.12. Inspections.... ....................................................................
................................
.38
4.13. Post Construction...... .........................................................................
...............
.39
5. References:............................................................................... ..................................
39
6. Disclaimer: ...................................................................................................................
40
Appendix 1 ..........................................................................................................................
41
7. Visual Tree Assessment Criteria: ....................................................................................41
Id No.:...............................................................................................................................41
Species: ...........................................................................................................................41
Age class:.........................................................................................................................41
Tree F’x TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 3 of 49
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1. REPORT REQUEST BRIEF:
This report has been commissioned by Lex Toth of Callaghan & Toth Civil, Environmental &
Hydraulic Engineers; engaging Tree Fix to assess trees on site and provide a tree appraisal
and suitability for retention proposal, regarding a number of trees identified as being within
the land development zones of Lot 1, 2, 3, 4 and 5, 6, 7 (or as first identified in Draft Drawing
1225-01 Lot 17,18,19,20, and 32, 31, 30) and as to the following
1. Identify trees with poor structure and health within described development lots
Refer to sections 3.1 to 3]1
2. The suitability for retention of two large Norfolk pines close to rear boundary of lot
20/11, services and close to future houses
Refer to sections 3.4 to 3.5
3. Recommend tree removal or retention where trees are within the zone of influence of
driveways and services.
Refer to sections 3.1 to 3.61
4. Comment on the exotic trees within the site and as marked on the attached plan
drawing 1225-02
Refer to sections 3.1 to 3.6J
5. Development management plan for tree protection where required
Refer to sections 4 onwards
All information within this report is supplied without prejudice
Site Location and Details:
Location: Proposed 29 lot subdivision of 55 Lake Mac Donald Drive Cooroy
The weather at the time of the inspection was light breeze and cloudy, after rain period.
(See Appendix 4 for site overview.)
2. INSPECTION METHODOLOGY BREIF:
Equipment used:
Diameter tape: for measurements of tree stems at 1.4m from ground level.
. Camera: Nikon COOLPIX S3100 and used to capture primary images.
o Personal iphone 4 was also used to capture supporting images
Design reference drawings: where provided by by Lex Toth of Callaghan & Toth Civil,
Environmental & Hydraulic Engineers
Review of design plans and inspection of trees and locations was carried out on site 30-5-
2013 by Scott Hanley (TREE FIX). Scott Hanley holds an AQF Level 5 Diploma in
Tree Fix TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 5 of 49
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3. VISUAL TREE ASSESSMENT AS PER LOT NUMBER.
Refer to Appendix 1 (section 7) ’Visual Tree Assessment Criteria’ for user explainer of
table elements if required.
The following tables under section 3, contain relevant information regarding trees
assessed on as per each allots site:
Lot 1, 2, 3, 4 and 5, 6, 7 (or as first identified in Draft Drawing 1225-01 Lot 17, 18, 19, 20,
and 32, 31, 30)
3.1. Lot 1. (Draft 1225-02 lot 17)
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Tree FIx TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 7 of 49
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Id No.
Location
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Camphora cinnamomum Camphor Laurel
Age Height (m) Crown Radius (m) Stem Diam at 1.4 m
Stem 1 - 43cm
20 years or greater 14m approx 4-6m approx
Stem 2 - 43cm
TPZ (m) SRZ (m)
Tree Protection Zones
6m radius approx 3m radius approx
Services and
drivewa
Footpath construction and installation of services within TPZ
s
GOOD: Despite some structural defects; Tree of typical shape and
Condition
form true to s ecies for location with ood vi our
LOW: Tree is part of a stand of trees. Potential removal of other
surrounding trees will expose this tree to weather and wind events
Suitability to retain that it may not tolerate without further structural development. Has
major asymmetric suppression of canopy development due to co-
dominate develo ment next to acacia
Would require considerable rectification to mitigate issues over time.
Comments
Ima es re resent the tree with lower cano then acacia
Recommendations REMOVE TREE not suitable as standalone tree
T<ee FIX TPMP2130610 Callaghan & Toth Lake MacDonald Drive Cooroy Page 9 of 49
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Id No. Tree 3 (M0500/12)
Lot 1. (Draft 1225-02 lot 17 )55 Lake MacDonald Dr Cooroy
Location
Centre of lot
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Mangifera species Mango
Age Height (m) Crown Radius (m) Stem base at 0.3 m
20 years or so 10-11 m approx 4-5m approx 47cm
TPZ (m) SRZ(m)
Tree Protection Zones
5.6m radius approx 2.8 m radius approx
Services and
Future residential building location potentially within TPZ
drivewa s
GOOD: Tree of typical shape and form true to species for location
Condition
with ood vi our
LOW: Tree is a commercial fruit tree and not considered a significant
Suitability to retain species for retention. Considered as undesirable in environmentally
rotected lands.
Species is not protected under Sunshine Coast Regional Council
Comments
local Law No. 19 Protection of Ve etation
Recommendations REMOVE TREE1
Tree F:x TPMP2130610 Callaghar & Toth Lake MacDonald Dnve Cooroy Page 11 of 49
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3.2. Lot 2. (Draft 1225-02 lot 18)
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Tree F,x TPMP2130610 Callaghar. & Toth Lake MacDonald Dnve Cooroy Page 13 of 49
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Id No.
Location
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Poinciana regia Poinciana
Age Height (m) Crown Radius (m) Stem Diam at 0.3 m
40 years or greater 14m approx 4-6m approx 93cm
TPZ(m) SRZ(m)
Tree Protection Zones
11.16m radius approx 5.6m radius approx
Services and Driveway, Footpath construction and installation of services
drivewa s within TPZ
FAIR: Tree not of typical shape and form of species for location with
Condition
FAIR vi our. Ma"or as mmetr of crown.
LOW: Tree is part of a stand of trees. Potential removal of other
Suitability to retain surrounding trees will expose this tree to weather and wind events
that it ma not tolerate without further structural develo ment.
Would require considerable rectification to mitigate structural issues
Comments over a very long period of time (greater then 15years). Images
re resent the tree’s 2 main stem leanin heavil over ara e
REMOVE TREE structure not suited to rectification or exposure as a
Recommendations
standalone tree
Tree FIX "T"pMP2130610 Callaghan & Toth Lake MacDonald D:we (oaroy Page 15 of 49
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3.3. Lot 3. (Draft 1225-02 lot 19)
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Tree FIx TPMP2130610 Callaghan & Toth Lake MacDonald Drive Cooroy Page 17 of 49
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Id No. Tree 11. (X500/10)
Location Lot 3. (Draft 1225-02 lot 19 )55 Lake MacDonald Dr Cooroy
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Lagunaria patersonia Norfolk Island Hibiscus
Age Height (m) Crown Radius (m) Stem base at 0.3 m
20 years or less 14-16m approx 5-6m approx 74cm
TPZ (m) SRZ (m)
Tree Protection Zones
6.0m radius approx 3.0m radius approx
Services and
On lot 3 and 4 boundary
drivewa s
GOOD: Tree of typical shape and form true to species for location
Condition
with ood vi our
LOW: Considered as an undesirable species to live with close to
Suitability to retain residential buildin s and activit areas.
Seed pods contain thousands of tiny hard bristle like hairs that are
Comments easily carried by wind and extremely irritating when in contact with
skin. Also known as the itch cow tree.
Recommendations REMOVE TREE and other tree in same row of same species,
Tree FIX TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Coarey Page 19 of 49
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Id No. Tree 12. (HP800/12)
Location Lot 4. (Draft 1225-02 lot 20 )55 Lake MacDonald Dr Coaroy
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Araucaria cunninghamii Hoop Pine
Age Height (m) Crown Radius (m) Stem base at 0.3 m
Greater than 50
22-23m approx 5-8m approx 74cm
ears
TPZ(m) SRZ(m)
Tree Protection Zones
8.88m radius approx 4.44m radius approx
Services and
On boundary of lot 3 and 4
drivewa s
GOOD: Despite defects, Tree is of typical shape and generally; form
Condition
true to s ecies for location with fair vi our
Suitability to retain LOW: Tree would require very large protection area
Hoop Pine is a Queensland native and a commercial timber that is
also endemic to the area of Cooroy. However large highly exposed
trees are less desirable close to new development sites.
While Araucaria species can tolerate areas of more frequent and
higher winds speeds; a fail safe for the species is to be able to shed
Comments
limbs in high wind speeds to reduce chance of the tree failing
completely.
Cooroy and local areas have been subjected to freak storm events
over the last 15 years and one such event in the last 3-4 years that
caused ma’or dama eta ve etation and throu hout the Coaro
Tree F x TPMP2130610 Callaghan & Toth lake MacDonald Drtve Coo ray Page 21 of 49
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3.5. Lot 11. (Draft 1225-02 lot 11)
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Tree F x TPMP213061Q Callaghan & Toth Lake MacDonald Drive Cooroy Page 23 of 49
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3.5. Lot 11. (Draft 1225-02 lot 11)
Page 13
Araucaria cunninghamii I Hoop Pine
Age Height (m) Crown Radius (m) Stem base at 0.3 m
Greater than 50
22-23m approx 5-7m approx 73cm
years
TPZ (m) SRZ(m)
Tree Protection Zones
8.88m radius approx 4.44m radius approx
Services and
On boundary of lot 11 to lot 4
driveways
FAIR to GOOD: Tree is of typical shape and generally; form true to
Condition
species for location with fair viqour
Suitability to retain LOW: Tree would require very large protection area
Hoop Pine is a Queensland native and a commercial timber that is
also endemic to the area of Cooroy. However large highly exposed
trees are less desirable close to new development sites.
While Araucaria species can tolerate areas of more frequent and
higher winds speeds; a fail safe for the species is to also be able to
shed limbs and reduce chance of the tree failing completely.
Cooroy has been subjected to freak storm events over the last 15
years and one such event in the last 3-4 years
that caused major
damage to vegetation and throughout the Cooroy community.
It is these local weather trends that would be of concern to the safety
of residential development around this tree.
There is also evidence of some minor limb failure, which is likely due
Comments
to high wind speed events in the past. Remaining limbs have over
developed by extension; likely as a response to past limb loss.
Fruit drop is also considered a hazard. Cones of the Hoop Pine are
hard and heavy for their cricket ball size. During their cone
development cycle, generall risk management under Hoop Pines, is
to close off and restrict access to cone drop zones, or installing
permanent catch nets for safety.
Considered as an undesirable species to live with close to (within
target zone of) residential buildings and or high activity areas.
The life span of Hoop pines has been recorded to be over 400 years
and reach heights to 60m. Such trees require very large areas to
factor in space requirements to support continued growth
development and also the well being of neighbourinq residence.
Under the current design proposal it is not recommended that this
Recommendations
tree is retained
Tree FIx TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 25 of 49
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Storm water line
Id No. Tree 14 (PB500/8)
Open space and storm water Bio Retention. (Draft 1225-02 Parallel
Location to Lot 4 and lot 11 ) 55 Lake MacDonald Dr Cooroy property
boundar
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Melaleuca sp (salicina) Paper Bark
Age Height (m) Crown Radius (m) Stem Diam at 1.4 m
20 years or less 12m approx 2-3m approx 45cm
TPZ(m) SRZ(m)
Tree Protection Zones
6m radius approx 3m radius approx
Services and Storm water runoff basin and storm water underground
drivewa s services construction within TPZ
Condition POOR: Structural failures and die back of tree section
Suitability to retain LOW: Tree with significant defect that cannot be rectified easily
Would require considerable rectification to mitigate issues over time.
Comments Images represent the tree with section die back in canopy and
numerous e icormic res onse rowth
Recommendations REMOVE TREE due to structural defects
Tree F x TPMP2130610 Callaghan & Toth Lake MacDonald Drive Cooroy Page 2 of 49
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Id No. N/A
Location Lot 5 (Wilgee Court (Draft 1225-21 lot 5)
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Age Height (m) Crown Radius (m) Stem Diam at 1.4 m
TPZ(m) SRZ (m)
Tree Protection Zones
Services and
drivewa s
Condition
Suitability to retain
No trees identified to be within or near proposed driveway
Comments
construction that re uire rotection
Recommendations
Tree FIx TPMP2 ’30610 Callaghar & Toth Lake MacDonald Drive Cooroy Page 79 of 49
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Id No. Tree 15 (PB500/7)
Location Lot 6 (Wilgee Court (Draft 1225-21 lot 6)
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Melaleuca sp (salicina) Paper Bark
Age Height (m) Crown Radius (m) Stem Diam at 1.4 m
30 years or more 12m approx 2-3m approx 45cm
TPZ(m) SRZ(m)
Tree Protection Zones
6m radius approx 3m radius approx
Services and
Driveway construction within TPZ 3.75m from stem base
drivewa s
FAIR: Mature tree with some defects and reduced vigour compared
Condition
to s ecies in area
Suitability to retain Good: Any defects that can be managed and tolerable for use area
Driveway construction will require cut and fill to construct over existing drain
way. Excavation of 200mm is likely to be made within TPZ to form and lay
concrete driveway slab. Tree Fix will be required to supervise excavation
Comments
within TPZ and perform any root pruning and management to AS4970 as
required. Images represent the tree in relation to proposed driveway
construction. Refer to tree rotection Ian.
Recommendations Retain tree
Tree F l( TPMP213061 0 Callaghan & Toth Lake MacDonald Drove Cooroy Page 31 of 49
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Id No. Tree 17(G500/14)
Location Lot 7 (Wilgee Court (Draft 1225-21 lot 7)
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Eucalyptus grandis Flooded Gum
Age Height (m) Crown Radius em) Stem Diam at 1.4 m
30 years or more 25m approx 6m approx 40cm
TPZ(m) SRZ (m)
Tree Protection Zones
4.8 m radius approx 2.4m radius approx
Services and
Driveway construction within TPZ
drivewa s
GOOD: Tree is of generally the typical shape and generally; form
Condition
true to s ecies for location with ood vi our
Suitability to retain LOW: Centre of driveway construction
Comments Not possible for retention under proposed driveway construction
Recommendations REMOVE TREB
Tree FIx TPMP213061 0 Callag’lan & Toti" Lake MacDonald Drive Cooroy Page 33 of 49
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Major upper
crown failure
Dead stem
section
Id No. Tree 19 (G600/16)
Location Lot 6 (Wilgee Court (Draft 1225-21 lot 6)
Assessor Scott Hanley Date: 30-5-2013
Genus I Species Common Name
Tree Identification
Eucalyptus grandis Flooded Gum
Crown Radius
Age Height (m) Stem Diam at 1.4 m
m)
40 years or more 25m approx 12 m approx 52cm
TPZ (m) SRZ(m)
Tree Protection Zones
7m radius approx 3.5 m radius approx
Tree FIx TPMP2130610 Ca laghaf"l & Toth Lake MacDonald Drive Cooroy Page 35 of 49
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4. TREE PROTECTION MANAGEMENT PROPOSAL:
The information within the tree protection plan gives details which are to be followed during
the development of the site. The tree protection plan refers to the Australian Standard, AS
4970 -
2009 Protection of trees on development sites, and to industry guidelines and best
practice.
The aim of the tree protection plan is to ensure that all trees identified for retention are
retained for longevity within reason of typical stability and healthy condition in location within
the new development construction site.
All tree that are to be retained on site will be monitored and managed to the following
guidelines and!
4.1. Site Induction & Awareness Briefings
TREE FIX is to liaise with a designated onsite foremen/supervisor from the construction
company to insure that the Tree Protection Plan is adhered to in Arborist absence from site.
The workers and respected contractors on the site are to be made aware of the Tree
Protection Plan by the main contractor prior to commencing works.
4.2. Tree Protection Zone Marking, Fencing and Signage Needs
Prior to any works commencing on the site the Tree Protection Fence (TPF), shall be
installed with appropriate listed materials or marked at as listed radius from trees between
chainage points, in the presence of TREE FIX in guided by the Australian Standard, AS 4970
-
2009 Protection of Trees on Development Sites. The location of the Line marking paint or
fence is to be agreed with TREE FIX and will follow guidelines as required set out in "Tree
Protection FencIng".
4.3. TPZ and SRZ calculations
All trees require a Tree Protection Zone has been determined by stem calculations. However
TREE FIX may designate encroachment zone as guided by AS4970 and or determine is
appropriate natural protections.
4.4. During Construction Access
Access to the TPZ is prohibited or restricted to those with permission. (permissions granted
to Liam Haynes). The site Project Arborist, TREE FIX is required to attend the site when
works are to be undertaken which may affect trees or the roots which are being protected by
the TPZ. TREE FIX shall oversee, advice and assist as and where required. Details of any
works carried out are to be recorded by TREE FIX and made available upon request.
Site Monitoring -
TREE FIX will carry out and record regular inspections of the site
incorporating the following to be added to the certification:
. The trees within the TPZ, and record any observation, e.g. Leaves becoming
discoloured if unseasonable, dieback in the canopy, splits in bark, etc.
. The TPZ fence to ensure that it remains in the correct position. If changes or defects
are noted these are to be recorded, the site foreman/ supervisor notified and the
changes or defects rectified as soon as possible.
. Impacts which may arise from construction.
.
Landscaping compliance with the TPZ.
.
Any rectification / remedial action which may be required at any stage is done so as
specified by TREE FIX.
Tree F-.x TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 3- of 49
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4.13. Post Construction
A post construction Arborist Report or Certification of compliance is to be prepared by TREE
FIX on the retained trees. A Visual Tree Assessment will be carried out on each tree
detailing the trees condition and vigour, damage or disturbance which may have occurred
and remedial works undertaken.
After the final inspection Certification of Compliance shall be supplied along with any
monitoring or rectification documentation as required.
TREE FIX 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.
5. REFERENCES:
Australian Standards AS 4373 -
2007 Pruning of amenity trees.
AS 4970-2009 -
Protection of trees on development sites
Wild Plants of Greater Brisbane -
Queensland Museum
Mangroves to Mountains -
field guide to native plants of SE QLD
Evaluating Tree Defects -
A Field Guide by Ed Hayes, Second Edition
Body Language of Trees -
Research for Amenity Trees, Claus Mattheck
Sunshine Coast Council -
CALCULATION OF HAZARD RATING
Smiley E. Thomas, Nelda Matheny and Sharon Lilly April 2012. Tree Risk Assessment:
Levels of Assessment
Matheny Nelda and Jim Clark Feb 2009. Tree Risk Assessment: What we know (and What
we Don’t Know)
Tree FIx TPMP2130610 Callaghar & Totn lake MacDonald DrIve Cooroy Page 39 of 49
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APPENDIX 1
7. VISUAL TREE ASSESSMENT CRITERIA:
Id No.:
Each tree is allocated an individual identification number to allow for easy identification and
reference.
Species:
Tree names / species abbreviated to the first three letters of the genus and species.
Tree species key:
Del reg Delonix regia (Poinciana)
Age class:
Approximate age stage, typical of each species, full description abbreviated to first letter of
age stage.
Y
.
Young: Early stage of growth, immature size
-
EM Early Mature: Tree not reached mature size
. -
. M -
Mature: Tree reached mature size
OM -
Over Mature: Tree has reached mature size and is starting to decline.
Condition:
The general health and condition of the tree: the assessment is based on trunk and crown
appearance.
G -
Good -
Tree with no defects or disorders which are notable. Tree at low
risk of failing with a low risk target e.g. park, open space or other trees
F -
Fair -
Tree with minor defects or disorders noted. Tree at a lower risk of
failing hitting a target e.g. park, path or garden
P -
Poor- Tree with major defects or disorders noted. Tree may be unsafe
and/or at a higher risk of failing hitting a high value target, e.g. property
Oead May be a good habitat tree for native fauna if reduced to safe height
-
and in a suitable location.
Suitability for Preservation:
This categorizes the suitability of the tree for preservation, considering the tree health,
structural condition, age, size, longevity, ability to adapt to new environments and aesthetics.
For trees in non-use areas (eg. Open space) where a range in tree quality is appropriate, all
trees may be considered suitable, except for invasive species.
Categories are:
Tree FIx TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Cooroy Page 41 of 49
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The Risk Level Rating indicates the time frame in which specified works are to be completed
in.
All pruning to be in accordance with or guided by AS 4373 -
"Pruning of Amenity
Trees"
All below ground works that are within the specified TPZ-SRZ shall be supervised or
perform by an AQF level 5 Arborist.
Tree FIX TPMP2130610 Callaghan & Toth lake MacDonald Dnve Cooroy Page 43 of 49
Page 23
,
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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 area and crown area requiring protection. This area should
be isolated from construction disturbance so that the tree can remain viable. The TPZ
incorporates the structural root zone (SRZ).
The radius of the TPZ is calculated for each tree by multiplying its DBH (Diameter at breast
height -
trunk diameter at 1.4m above ground) x 12
Example: .5 m DBH x 12 = 6m Tree protection zone (TPZ)
A TPZ should not be less than 2m or greater than 15m (unless crown protection is required).
7.1.2 SRZ
Structural root zone, as specified in AS 4970-2009 Protection of trees on development sites,
is the surface area of protection.required to maintain tree stability -
a larger area is required
to maintain a viable. 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 trunk diameter 0 measured in metres
(above the root buttress) and applying the following formula:
0.42
(0x 50) x 0.64
RSRZ =
The SRZ for trees with a trunk diameter less than 0.15m will be 1.5m.
7.2 Tree Protection Fencing (TPF)
Once the TPZ measurements and construction requirements have been calculated for the
trees to be retained the alignment of the TPF may be determined. The TPF is required to be
installed in the presence of TREE FIX prior to any construction works commencing on the
site and for it to stay intact until completion of all works.
Any tree removal or pruning within the TPZ could be carried out prior to the TPF being
installed. These works are to be supervised and recorded by Consult Arborist Pty Ltd.
When specified in the Arborist Report the TPZ area will be mulched with com posted tree
wood chips to an approximate depth of 100mm prior to fence installation. An additional Plant
Health Care Program and/or temporary irrigation may also be specified.
The TPF is to be steel mesh panels (As detailed in AS4687-2007 Temporary fencing and
hoardings) and held in place with concrete feet, the nut and bolt holding the clamps are to be
tightened with a spanner to prevent the fence from being easily moved and secured to
restrict access to those with permission only. Shade cloth or something similar can be
attached to the fence to protect the area from airborne matter. Uneven ground and or
exposed sites may require additional staking to hold the fencing in place. Care is to be taken
when installing the additional bracing not to damage tree roots or hit underground services.
Where the use of steel mesh panels (As detailed in AS4687-2007 Temporary fencing and
hoardings) is deemed not suitable for the site, the TPF can be constructed from orange site
Tree F- x r PMP~130610 Callaghan & Toth Lake MacDona’d Drive Cooroy Page 45 of 49
Page 24
"
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Fig 2: Sample TPZ fencing & sign location
TPZ Warning signs
Tree rlx 1PMP2130610 Callaghan & TaU- Lal<e Mac()ona d JrlVe l:ooroy Page 47 of 49
Page 25
.
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Tree FIX TPMP2130610 Callaghan & Toth Lake MacDonald Dnve Coorov Page 49 of 49
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Used in these records
REFERENCED DOCUMENT Arboricultural Tree Appraisal - REC13.0095Related documentApplication case desk ↗
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