Arborist Brief

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Contents
  1.     Introduction ...................................................................................................................................... 2
  1.1       Brief ............................................................................................................................................... 2
  1.2       Qualifications and Experience....................................................................................................... 2
  2.     Site Visit and Observations ............................................................................................................... 2
  2.1       Site Visits ....................................................................................................................................... 2
  2.1.1         Tree Species .............................................................................................................................. 2
  Table 1: Assessment data captured from 25 Dwyer Street, Sunshine Beach. .......................................... 2
  3.     Inspection Results: ............................................................................................................................ 3
  Table 2: TPZ and SRZ radius calculations. ................................................................................................. 3
  4.     Site Images ........................................................................................................................................ 4
  5.     Conclusion: ........................................................................................................................................ 6
  6.     Recommendations: ........................................................................................................................... 6
  7.     Reference .......................................................................................................................................... 7
  Appendix 1 - Explanatory Notes ............................................................................................................... 8
  Appendix 2 – Disclaimer.......................................................................................................................... 10




 Version                       Date                             Authored                          Reviewed                         Validated
 Draft                         22/06/22                         JH                                BH                               JH
 Reviewed                      27/06/22                         JH                                SN                               JH
 F2




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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1. Introduction
1.1 Brief
Treesafe Australia Pty Ltd has been engaged by Menzie Designer Homes to carry out a tree
inspection for the provisions of an Arborist Brief. The Arborist Brief shall include inspection notes
which identify the tree protection zones (TPZ) and the health and sustainability of three Red
Bloodwoods located on the council verge of No. 25 and No. 27 Dwyer Street Sunshine Beach.
TPZ calculations have been formulated in accordance with AS 4970 Protection of trees on
development sites.

1.2 Qualifications and Experience
The provisions of the Arborist Brief are based upon site observations from ground level and the
data captured onsite upon the day of assessment. The consulting arborist, Justin Harvey has
attained an AQF level 5 in Arboriculture (Diploma of Arboriculture AHC 50510).

2. Site Visit and Observations
2.1 Site Visits
The consulting arborist liaised with the property owner on site to discuss the re-alignment of the
proposed driveway access and the predicted impacts which the trees on the verge will sustain
from the proposed works.
A site inspection was carried out to collect data for the provisions of the Arborist Brief. The Arborist
Brief is based upon the evidence gathered at the time the assessment.
All tree inspections are performed from ground level without detailed investigation unless
otherwise noted within the assessment. The method of inspection performed was a basic level 2
visual tree assessment (VTA) as per ISA guidelines, ANSI A300 Standard for Risk assessment
and ISA’s Best Management Practices: Tree Risk Assessment.

2.1.1 Tree Species
               Common             Botanical
 Tree No.                                              Height (M)         DBH (mm)       DABF (mm)
               Name               Name

               Red                Corymbia
 1                                                     9                  430            470
               bloodwood          gummifera

               Red                Corymbia
 2                                                     8                  310            370
               bloodwood          gummifera

               Red                Corymbia
 3                                                     9                  390            420
               bloodwood          gummifera


Table 1: Assessment data captured from 25 Dwyer Street, Sunshine Beach.



Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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3. Inspection Results:
A total of three trees have been identified along the council verge of No. 25 and No. 27 Dwyer
Street. Tree No. 1 and tree No. 2 are situated on the council verge fronting 25 Dwyer Street with
tree No. 3 situated on the verge fronting property No. 27.
Tree No. 1 is a mature Red Bloodwood (Corymbia gummifera) with several over extended branch
structures and deadwood Greater than (<) 50 mm in diameter. A co-dominant, first order branch
on the Northern side of the tree over hangs the driveway and service wire to the house. The
branch has poor taper with excessive end weight applying mechanical load force on a right-angle
bend in the branch estimated at 1.5 meters from the stem bark ridge. A shear plane crack is
evident as the result of this excessive mechanical load force. Kino* exudate is also evident around
the wound area.
Well-formed reaction wood is evident around a second shear plane crack on the dominant side
of the tree to the south. The apical section of the canopy is displaying indications of die back
perhaps resulting from canopy edge exposure and salt sheer from coastal prevailing winds to the
south.
Tree No. 2 is a semi-mature Red Bloodwood (Corymbia gummifera) with large to moderate
deadwood throughout the canopy. This tree displays signs of poor vigour with a 10-20% live crown
ratio. Indications of stress are evident with the presence of kino* exuding along the surface of the
trunk in local areas. Several girdling roots have formed at ground level with a well-developed
cavity extending beneath the soil level.
Tree No. 3 is a semi-mature Red Bloodwood (Corymbia gummifera) with an 80% live crown ratio
and minor deadwood. Large, exposed surface roots extend to the east and west from the root
collar. Although this tree is situated outside the proposed development area, sensitive works
methodologies should be considered to avoid damage to the root system, trunk, and branches of
the tree whilst all earthworks and construction activities are carried out.
Determining the Tree Protection Zone (TPZ): (Extract from AS 4970:2009) The radius of the
TPZ is calculated by multiplying its DBH x 12. TPZ = DBH x 12 DBH = trunk diameter measured
at 1.4 metres above ground. Radius is measured from the centre of the stem at ground level.
Determining the Structural Root Zone (SRZ): SRZ radius = (D x 50)0.42 x 0.64 where D = trunk
diameter, in metres, measured above the root buttress or Diameter Above Root Buttress (DARB).

 Tree No.     DBH (mm)              TPZ (M)                DARB (mm)              SRZ (M)

 1            430                   5.16                   470                    2.41
 2            310                   3.72                   370                    2.18

 3            390                   4.68                   420                    2.30


Table 2: TPZ and SRZ radius calculations.




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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4. Site Images




Image 1. Trees inspected: 1 and 2, Red Bloodwood, Corymbia gummifera , located on the council
verge fronting 25 Dwyer Street.




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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     Image 2. Tree No. 1 with a shear                       Image 3. Tree No. 3 situated on the
     plane crack and evident kino                           council verge of No. 27 Dwyer
     exudate at the wound area.                             Street.




      Image 4. Tree No. 2 with evidently                     Image 5. Tree No. 2 with a well-
      poor vigour and a 10-20% live                          developed     cavity    extending
      crown ratio.                                           beneath the soil level.



Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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5. Conclusion:
Tree No. 1 requires extensive pruning work to remove all large dead sections within the canopy.
Various branch structures require end weight reduction including the co-dominant stem which
over hangs the driveway and service wire to 25 Dwyer Street. This stem is structurally
compromised and will require removal back beyond the shear plane crack to the stem bark ridge.
End weight reduction to reduce the load force on this fault is not practicable due to the formation
of the second order branch structures.
A considerable amount of pruning work is required for this tree. Branch end weight reduction
crown maintenance and the removal of the co-dominant stem will exceed the percentage of
annual pruning allowable within a growth season. It is of my professional opinion that this tree has
reached the final stages of its useful life expectancy within its urban setting.
Evidently tree No. 2 is presenting signs of poor vigour with a rapid decline in health and structure
This tree should be removed for safety reasons within 2 months.
Tree No. 3 should be retained and will require protection throughout the stages of the proposed
works. Refer to AS 4970, Tree Protection on Development Sites for tree protection methodologies
throughout the stages of construction.



6. Recommendations:
        •   Utilise sensitive earthworks methods to avoid damage to vegetation whilst removing
            the existing concrete driveway.

        •   Employ a qualified arborist team AQF 3 or equivalent to carry out the removal of the
            vegetation on the northern side of the existing driveway.

        •   Provide Supplementary plantings to compensate for vegetation loss.

        •   Refer to the development guidelines AS 4970 Protection of trees on development
            sites.

        •   Refer to the guidelines of Noosa Shire Councils tree management principles.

        •   Employ a consulting arborist to oversee future excavation works around tree No. 3.

        •   Consider selecting species which are native and salt tolerant.




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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7. Reference
Leaf & Limb Horticultural Consultancy; Registered (c) Samuel Cowie; Dip. Arb/Hort
Trees on Building Sites: Dr Gary W Watson, Dr Dan Neely; Published by The International Society
of Arboriculture (c) 1995 All Rights Reserved
Eucalypts of the Sunshine Coast and the Coast from Bundaberg to Coffs Harbour. Tony Bean.
Publisher T. Bean, 1983.
Harden, G, Mc Donald, B Williams, J
Rainforest trees and shrubs, A field Guide to their identification, Gwen Harden, NSW, Australia,
2006.


Glenn Leiper, Jan Glazebrook, Denis Cox and Kerry Rathie.
Mangroves to Mountains, Revised Edition 2014, A field guide to the Native Plants of Southeast
Queensland.
Matheck, C. Breloer, H.
The Body Language of Trees: A Handbook for Failure Analysis.TSO, London, England.


Matheny, N. Clark, J.R.
Trees and Development (A Technical Guide to Preservation of Trees During Land Development)
ISA, Illinois, 1998


Standards Australia
Australian Standard AS 4970 Protection of trees on development sites. (August 2009)


Standards Australia
Australian Standard AS 4373 Pruning of amenity trees. (March 2007)




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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Appendix 1 - Explanatory Notes

•       Mathematical abbreviations: > = Greater than; < = Less than.
•     Measurements/estimates: All dimensions are estimates unless otherwise indicated.
Measurements taken with a tape or clinometer are indicated with a ‘+’. Less reliable estimated
dimensions are indicated with a '?'.
•         Species: The species identification is based on visual observations and the common
English name of what the tree appeared to be is listed first, with the botanical name after in
brackets. In some instances, it may be difficult to quickly and accurately identify a particular tree
without further detailed investigations. Where there is some doubt of the precise species of tree,
it is indicated with a '?' after the name in order to avoid delay in the production of the report. The
botanical name is followed by the abbreviation sp if only the genus is known. The species listed
for groups and hedges represent the main component and there may be other minor species not
listed.
•       Height: Height is estimated to the nearest metre.
•       Spread: The maximum crown spread is visually estimated to the nearest metre from the
furthest extent of live lateral branches on one side of the canopy to the tips of the live lateral
branches on the opposing side of the canopy.
•      Diameter: These figures relate to 1.5m above ground level and are recorded in
centimetres. If appropriate, diameter is measure with a diameter tape. ‘M’ indicates trees or
shrubs with multiple stems.
•       Estimated Age: Age is estimated from visual indicators and it should only be taken as a
provisional guide. Age estimates often need to be modified based on further information such as
historical records or local knowledge.
•       Distance to Structures: This is estimated to the nearest metre and intended as an
indication rather than a precise measurement.
Frass: A sawdust like after effect from wood and bark chewing/boring insects.
Shot Holing: A local area of absent leaf tissue caused by sap sucking or leaf chewing insects.
Adventitious Roots: Commonly referred to palm tree root systems, a response caused by a
reaction to oxygen.
Tilth- The loosened effect of soil in the hole walls and floor.
Epicormic growth: Stress shoots, water shoots, re-growth or suckers. Poorly attached, quick
growing.
Kino: Botanical gum or resin produced by various tree species including species of Eucalyptus.
Adventitious shoots: A branch arising from a stem or parent branch having no connection to
apical meristems.



Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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TPZ: Tree Protection Zone
SRZ: Structural Root Zone
CRZ: Critical Root Zone
TPF: Temporary Protection Fencing
Basic VTA: Detailed visual inspection of a tree & surrounding site that may include the use of
simple tools. It requires that a tree risk assessor walk completely around the tree trunk looking at
the site, above ground roots, trunk & branches.




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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Appendix 2 – Disclaimer

All care has been taken to obtain information from sources which by all means are reliable. All
information and data has been verified as far as possible. However, Treesafe Australia Pty Ltd
cannot guarantee nor be responsible for the accuracy of information provided by others.
Unless stated otherwise:
Information contained in this report covers only the trees that were inspected and reflects the
conditions of the trees at the time of inspection.
Trees are assessed under typical weather conditions and do not account for large weather events
with a rating of Beaufort scale 9 (Strong gale 76-87Km/h. 41-47knots) or greater.
The inspection was limited to the visual examination of the subject tree without drilling, coring,
probing, x-ray imaging, excavation, dissection or any other tool or method unless stated within
this report.
There is no warranty or guarantee, expressed or implied, that any issues, problems faults, failures
or deficiencies of the subject tree(s) may not arise in neither the present nor the future.
Treesafe Australia Pty Ltd reserves the right to forward a copy in full of this report to any local,
state, or federal government body or regulatory authority that may request this report for the
assistance in making an informed assessment of the trees on site.
This report has been prepared for the exclusive use of the client and Treesafe Australia Pty Ltd
accepts no responsibility for its use by other persons or organizations. The client/approved
recipient of this report acknowledges that this report and any options, opinions, advice, or
recommendations expressed or given in this report are based on the information supplied by the
client and on the data inspections, measurements and analysis carried out or obtained by
Treesafe Australia Pty ltd. and referred to in this report. The client/approved recipient should only
rely on this report and on its contents only to that extent.




Justin Harvey

0423 672 794

Diploma of Horticulture (Arboriculture)
AQF level 5/Certificate No. 9167205001385




Arborist Brief– TSA: 25 Dwyer Street Sunshine Beach. (* See explanatory notes)
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