Decision Notice OPW25 0057 · OPW25/0057

                      b.      Stormwater runoff from the site is not currently, and is not likely to result in visible
                              evidence of sedimentation or erosion, or lead to water contamination.
                              If at the time of request for plan sealing, the method of short-term stabilisation has not
                              achieved a level of stability that Council's Officers believe will have a high probability
                              of achieving long term stability (i.e. until house construction has occurred on all lots),
                              Council Officers may take the following matters into consideration in determining
                              whether the site is capable of achieving medium to long-term stability:
                              •     evidence that the site has been effectively stabilised in the short term;
                              •     evidence that soil has been adequately ameliorated;
                              •     evidence that seed of annual and perennial grass species has been applied at an
                                    adequate rate; and
                              •     that grass seed has germinated at a density that is likely to achieve an effective
                                    grass cover.
                              For example, while hydromulch can provide an immediate and effective stabilising
                              cover to soils, the protective cover can be relatively short-lived if vegetation fails to
                              establish before the thin layer of mulch decomposes. So if hydromulch is selected as
                              the method of temporary short term stabilisation, Council Officers will seek to confirm
                              that perennial as well as annual grasses are well established at the time of plan sealing
                              to reduce the risk of instability of the site in the medium to long term. As a general rule,
                              hydromulch will only be accepted as a “patch” fix and should comprise no more than
                              20% of the exposed site area due to the high risk of failure. Due to the requirement to
                              progressively stabilise exposed areas, it is not envisioned that this will present any
                              difficulties for an appropriately managed and compliant site.
                      Retention of Existing Trees
               11.    The existing trees on adjoining properties must be retained and protected during construction
                      wherever achievable. To avoid doubt, this advisory note is not intended to exclude the
                      operation of Chapter 3 of the Neighbourhood Dispute Resolution Act 2011 following
                      construction of the development which is the subject of this development approval.
                      Qualified Person
               12.    Qualified Person, for the purpose of:
                      a.      Supervising landscape works and preparing a landscape certification, is considered to
                              be a landscape architect, landscape designer or horticulturist with a minimum of three
                              years current experience in the field of landscape design.
                      b.      Undertaking landscape construction and establishment works is considered to be a
                              person with five years current experience in commercial landscape construction
                              projects.
                      c.      Undertaking, supervising tree works and preparing arboriculture certification, is
                              considered to be a person with a minimum three years current experience in tree
                              protection, hazard identification/mitigation and Specifying Trees – a guide to
                              assessment of tree quality (NATSPEC) assessment and either:
                              i.       International Society of Arboriculture (ISA) certification; or
                              ii.      A Diploma of Arboriculture.
                      d.      Managing Fauna protection is considered to be a certified Fauna Spotter Catcher.
                      e.      Preparing certification and managing declared plant pests, is considered to be:
                              i.       a landscape architect with a minimum of 3 years current experience in the field
                                       of pest plant management;
                              ii.      a botanist or ecologist with a minimum of 3 years current experience in the field
                                       of pest plant management;




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Document Set ID: 24052669
Version: 2, Version Date: 22/08/2025