Attachment 4 -Arborist Report July 2020 · OPW20/0145

Tree Analysis: Disturbance footprint

 Observations and Considerations
 The vegetation currently occupying the site is aged between 40 to 50-years old, with a few older remnant trees that were
 retained when the site was cleared. Tree species observed include, but not limited to, Eucalyptus resinifera (Red Mahogany),
 Syncarpia glomulifera subsp. glomulifera (Turpentine), Corymbia intermedia (Pink Bloodwood), Eucalyptus robusta (Swamp
 Mahogany), Melaleuca quinquenervia (Broadleaf Paperbark) Eucalyptus grandis (Flooded Gum) and Lophostemon confertus
 (Brush Box). Lophostemon suaveolens (Swamp Box) were a less frequent canopy species. Less common tree species included
 Eucalyptus grandis and Eucalyptus microcorys (Tallowwood). Some areas were also dominated by dense regrowth of
 Allocasuarina littoralis (Coast She-oak) in areas which have been previously disturbed.


 Area Located adjacent to proposed lots
 The fringe of the cleared area consists of, but not limited to, spindly regrowth Melaleuca quinquenervia. The clearing works
 has and will alter the exposure of the newly created boundary trees, exposing them to environmental forces which they
 have not developed to withstand. Numerous subjects have failed due to windthrow, due to insufficient root mass and/or
 soil water levels at above field capacity. Saturated soils lose their adhesive qualities and root plates fail by way of a transverse
 shear of the plate or ball.
 Further examples of windthrow failure are from those subjects with tall slender structures, their height diameter (H/D)
 ratios above 50. High H/D ratios have a higher probablity of failure due to the loading of the stem higher than prescribed by
 the axiom of uniform stress (Mattheck, C. 2007). There are also numerous long over-extended lower lateral branches
 present, which may also fail due to the length to diameter (l/D) ratio when exposed to additional wind forces due to removal
 of co-located trees.
 Dead trees are also present in varied states of deline and/or degradation within 10m of the the new boundary lines, carparks
 and/or footpaths. Deadwood and/or sections of the dead crowns are fall hazard risk to the fringes and/or footpaths to be
 constructed.
 It is also proposed to cut soil on Lot 2. A Tree Protection Zone (TPZ) would be applicable to retained EMT vegetation along
 the Hoffman Drive boundary.


 Environmental Considerations
 Retained trees have developed symbiotically with the subject to be retained along the boundaries as identified in layout of
 retained vegetation highlighted in purple fringes on page 13. These specimens rely on the subjects adjacent for shelter from
 the wind forces. These specimens are not listed as threatened or endangered under the Nature Conservation Act and its
 regulations.


 Recommendation
      1.   Appoint a project Arborist.
      2.   Adopt project Arborist guidelines as indicated on Page 12.
      3.   Appoint a suitably qualified Fauna Spotter Catchcer to underake a pre and post clearing report.
      4.   Undertake a pre-start meeting to identify and mark clearing lines.
      5.   Undertake supervised clearing works.
      6.   Remove trees along the fringe with a higher probability of failure with H/D ratios over 50, as identified by the
           project Arborist. Works within the EMT and boundary line shall be undertaken by a suitably qualified AQF Level 3
           Arborist in a manner so as not to damage retained vegetation and certified by the project Arborist.
      7.   Remove dead trees within 10m of the boundary of the EMT zone within failure reach of the boundary. These works
           are to be undertaken by a suitably qualified AQF Level 3 Arborist and supervised by the project Arborist.
      8.   Remove major deadwood within 10m of the boundary of the Emt zones within failure reach of the boundary or
           proposed footpath. These works are to be undertaken by a suitably qualified AQF Level 3 Arborist and supervised
           by the project Arborist.


 Priority Classification
 Medium

Arborist Report for 28 Eenie Creek Road, Noosaville
Prepared by Arbor Operations – July 2020
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