K - Preliminary Arborist Report (29.08.2019)

04.1 SUMMARY OF REPORTING STAGES

Treescience has only been involved in this project at stage ONE, therefore based on our

findings within this report, established location of the subject trees, this report initiates

Stages TWO and THREE along with a tree survey.



It is assumed by Treescience that the reviewed and issued design drawings are final.




05             IMPACT ASSESSMENT and TREE-SPECIFIC MITIGATION MEASURES



The successful long-term retention of trees on construction sites requires understanding of
the ease with which trees may be damaged or killed. The following general principles
should be noted:


     o     older trees are generally at greater risk than younger trees and are less able to
           tolerate changes to soil conditions or pruning
     o     most mature trees have roots that spread beyond the canopy dripline with tree
           roots
     o     tree roots are typically found within the top 1000mm of soil
     o     raising soil levels around the trunk/root system of trees will normally result in tree
           decline via root asphyxiation
     o     lowering soil levels close to trees will normally result in tree decline
     o     compaction of the soil profile, caused by vehicular traffic, destroys natural soil
           structure/microbiology resulting in poor aeration and loss of water absorption
           leading to root death
     o     spillage of chemicals, fuels or cement on the ground occupied by tree roots will
           cause root death




06            PROPOSED CONSTRUCTION ACTIVITIES



Largely, the construction objectives of critical interest are minor bulk earth works and
landscape works generally pertaining to car parking.


Generally, the existing soil grade within the subject tree’s TPZ shall not be significantly
lowered beyond 150mm without prior design outcomes documented and arboriculturally
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certified by the appointed Supervising Project Arborist.


PAR: V2
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