Approved Document OPW18-0319 · OPW18/0319

                                                                                  Consult Arborist

5.6       TREE 6 - BLACKWOOD
 ID         Genus & Species                         Common Name
 6          Acacia melanoxylon                      Blackwood
 Height                 Crown Spread                [email protected]         Age
 10-12m                 4-5m                        300-400mm               Mature
 Health                                             Structure
  Fair reduced vigour                               Poor strongly development of phototrophic lean
 Target                        Occupancy                            Target Zone
 Residential dwelling          Constant                             Within 1 x height & Dripline
 Comments

 Tree 6 is located within 3m of the adjacent Unit with a predominant phototrophic lean towards and
 over the roof. It presents a pronounced asymmetrical canopy with canopy connectivity to adjacent
 trees.

 There is evidence of defective/decay pockets on the tension side of the main trunk although no
 active fungal or insect attack was noted at this time.

 Blackwoods are a relatively short-lived species with limited ability to respond to decay once well-
 established with a rapid decline in health ensuing.

 The risk matrix has been calculated on total tree failure.
 Likelihood of Failure           Likelihood of Impacting Target        Matrix 1 - Result
 Possible                        High                                  Somewhat Likely
 Consequence of Failure          Matrix 2 – Overall Risk Rating        Work Priority
 Significant                     Moderate                              Within 6 months
 Recommendations

 While the tree looks healthy and in a suitable condition for retention the defects noted and location
 directly adjacent to and targeting a Unit renders the tree unsuitable for retention.

      •     Proactive removal within 6 months.

 Residual Risk on completion of Mitigation Options
 NA




19_01_24_TRA_RACV Resort _Noosa_V3                                                       Page 16 of 32