Operational Works Application OPW19-0033 · OPW19/0033

Consult Arborist

 

APPENDIX 1 ~ DEFINITION OF TERMS

The following criteria have been used in the report to gather information and determine the required management
options on the grounds of public health and safety. Measurements are approximate and made visually by eye
unless otherwise stated.

 
 
  

    
  

 

  

 

 

Young: Early stage of growth, immature size, established

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 maiure 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 advanced colonisation by fauna and flora.

 

     
 

 

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 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 fo 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

   
 

   
 

  

This retention val mes from the Institute of Australian Consulting Arborists (ACA), 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
ail other altematives 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.

 

 

 

 

 

  
 

 

 

 

     
 

” Diameter at Breast Height - The approximate diameter of the trunk is measured visually in millimetres ata
height of 1.4m.

 

 

19_02_07_AA_205 Blueberry Drive Page 11 of 11