ECM_22343519_v1_Aboricultural Impact Assessment · 132000.200173.1

                                                                                                                          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:         The tree has reached mature size and is unlike to increase significantly in height or mass. Retrenchment of
                                       the upper crown with increased vegetative vitality in lower crown, increased fungal activity and wood decay,
                                       increase colonisation by flora and fauna.
                  Veteran:             Tree with advanced retrenchment, reduced crown size and annual increment growth, extensive hollowing,
                                       crown collapse, low vigour, 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 the 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:
                  The retention value status is based on industry recognised methods of ascertaining the retention value of a tree. The suitability
                  of the tree for preservation or retention is based on the individual qualities of each tree. By taking into consideration the health,
                  structural condition, aesthetics, age, size, longevity (Safe Useful Life Expectancy) and ability to adapt to new environments the
                  viability of the tree can be reasonably determined.
                  For trees in non-use areas (e.g., Open spaces) where a range in tree quality is appropriate, all trees may be considered
                  suitable, except for invasive species.

                  Suitability for Retention/Preservation Categories are:
                  High:               Tree retention is the priority.
                                      The tree has high amenity, heritage and/or environmental value. It is in reasonably good condition (any minor
                                      structural or health problems can be mitigated), has a long life expectancy and can recover from injury or
                                      respond to environmental changes.
                  Medium:             Tree retention is desirable.
                                      The tree is in fair-good condition, is a locally common species, the tree contributes to the aesthetics of its
                                      locality and should survive for many years. The tree may have health or structural problems that can be
                                      mitigated with treatment.
                  Low:                The tree is not considered worthy of special measures to ensure its retention.
                                      The tree is in poor condition with significant defects that cannot be mitigated, has a short Useful Life
                                      Expectancy, or the tree is expected to decline regardless of treatment. The tree has low value in the
                                      landscape or is an undesirable species.
                  Remove:             Tree removal is recommended.
                                      Trees are considered potentially hazardous, very poor specimens, and/or may be environmental or noxious
                                      weeds.




                 23_01_23_AS_Adapt_2 Arakoon                                                                                            Page 17 of 17
Document Set ID: 22343519
Version: 1, Version Date: 16/03/2023