Decision Notice OPW20 145 06 (As Published) · OPW20/0145.06

               8.     A minimum maintenance period of 12 months will apply to all municipal works and thereafter
                      until such time as the works are performing in accordance with the approved design unless
                      noted otherwise
               9.     Development obligations refers to all conditions of approval relative to the development
                      permit. This includes, but is not limited to, Civil Works, Park improvements, landscaping,
                      provision of “As Constructed” information, test certificates, revegetation, sediment and
                      erosion control.
                      Environmental Advisory Notes
               10.    The Environmental Protection Act 1994 states that a person must not carry out any activity
                      that causes, or is likely to cause, environmental harm unless the person takes all reasonable
                      and practicable measures to prevent or minimise the harm. Environmental harm includes
                      environmental nuisance. In this regard persons and entities, involved in the civil, earthworks,
                      construction and landscaping phases of this development are to adhere to their ‘general
                      environmental duty’ to minimise the risk of causing environmental harm.
                      Erosion and Sediment Control
               11.    Accepted best practice standards include:
                      a.      International Erosion Control Association Australasia Best Practice Erosion and
                              Sediment Control document
               12.    Qualified Person, for the purpose of erosion and sediment control is a Certified Professional
                      in Erosion and Sediment Control (CPESC) or suitably experienced Registered Professional
                      Engineer of Queensland (RPEQ)
               13.    As a general rule, a site is determined to have achieved effective short-term stabilisation if
                      at the time of the plan sealing inspection:
                      a.      Methods of stabilisation are:
                              •        appropriate for slopes and slope lengths; and
                              •        are consistent with best practice environmental management practices such as
                                       in the Manual for Erosion and Sediment Control or the IECA Manual; and
                      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



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Document Set ID: 24395463
Version: 4, Version Date: 03/02/2026