RFI - Aboricultural Impact Assessment

6.2 TREE AT #21
The second tree is located outside #21 Bottlebrush Avenue and stands within a raised garden
bed and measures 12-14m in height with a canopy radius of 4-5m. Being a younger tree with
a smaller trunk diameter, its NRZ has been calculated at just over 4m.

Having grown up in a verge setting, its root zone is unlikely to be even in spread. On reviewing
Google Street View, it appears that sometime around 2018, the timber retaining wall structure
was replaced and upgraded with two support posts created within the tree’s SRZ. This likely
impacted the roots and caused physical damage to the lower trunk. 6 years later, this damage
is manifesting as basal trunk decay that was noted during the site inspection.




        Figure 6: Overview of the subject tree      Figure 7: Retaining wall and damage to trunk



As previously highlighted, this species of           tree   is   renowned       for   poor    timber
compartmentalisation, resulting in rapid decay.

The project design illustrates that the development design will require excavation up to the
property boundary and along the side of the retaining wall return. Although this would be
classed as an NRZ intrusion, it does not require the removal of the subject tree by the project.

However, the tree’s long-term suitability for retention is questionable; Noosa Council should
consider its removal and replacement within the coming years.

6.2.1 EARLY WORKS
   •   Remove the understory vegetation from the council verge in front of the site.

   •   Erect boundary site fencing, which will also act as the Exclusion Zone fencing.




25_10_21_AIA_TPA_23BottlebrushAve                                                       Page 10 of 19