OPW25/0012 - Arborist Report & Vegetation Management Plan

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[OCR of page images]
Arborist Report
3 &7 Serenity Close, Noosa Heads

4.2. EVALUATION AND ASSESSMENT

Results of the assessment of tree retention opportunities indicated that trees were
nominated for removal where:

e the vegetation was exotic or a pest species and located where it could ‘escape’ to
adjacent natural areas,

e tree condition was such that long term survival could not be guaranteed i.e. trees in
poor condition and the tree did not provide significant habitat value e.g. koala
habitat tree, or contained hollows for arboreal mammals, reptiles or birds,

e impacts exceeded tolerable levels ex post evaluation of design and construction
measures; and,

e necessary for the construction / installation of services.

The design of the approved development went through a number of iterations to avoid
and minimise impacts to adjacent trees. Examples of design changes by the project
engineers and architects include:

e Articulation of built form and structure to enable tree retention, including boundary
setbacks (i.e., landscape buffers) and built design to retain significant trees.

e Use of sheet piling to avoid encroachment from batters associated with basement
excavation.

Spatial analysis and evaluation and assessment in accordance with AS 4970-2009
Protection of trees on development sites suggested that at least 547 of the surveyed trees
would need to be removed as a result of the approved development, including:

e 531 native trees,
e Four (4) exotic or non-endemic trees, and,
e 12 dead trees.

Trees retained and removed are shown on VMP04a-VMPO4j (Appendix 1). Not all trees
proposed for removal are impacted by the development - at least 54 trees in poor
condition have been recommended for removal in accordance with arboricultural best
practice. These trees could be replaced within areas of retained vegetation or landscape
open space as determined by the Project Landscape Architect.

Results indicated that 391 trees are to be retained. Results of spatial analysis indicated that
encroachment within the TPZ of trees to be retained was either insignificant i.e. less than
10% of the TPZ in accordance with AS 4970-2009 or, where encroachment exceeded 10%
was unlikely to lead to long-term impacts subject to the adoption of best practice design
and management measures which are described in Section 5.

LTORIAS

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