Delegated Report - Code - Planning OPW25 0121 (As Published)

                      a.      Minimise Erosion:
                               i.       For areas of the site which drain to a sediment basin, implement drainage and
                                        erosion control measures prior to rainfall which prevent or minimise rill erosion
                                        and gully erosion
                              ii.       For areas of the site which do not drain to a sediment basin, implement drainage
                                        and erosion control measures prior to rainfall (including contingency measures)
                                        which prevent or minimise erosion, including rain drop erosion, chemical
                                        erosion, rill erosion and gully erosion
                             iii.       Prior to the sealing of the plan of survey for the development, all site surfaces
                                        must be effectively stabilised using methods which have achieved effective
                                        short-term stabilisation and which will continue to achieve effective stabilisation
                                        in the medium to long-term.
                                        For the purpose of this condition, an effectively stabilised surface is defined as
                                        one that does not, or is not likely to result in visible evidence of soil loss caused
                                        by sheet, rill or gully erosion or lead to sedimentation, or lead to water
                                        contamination.
                      b.      Manage concentrated stormwater flows
                               i.       Prior to each rainfall event ensure concentrated stormwater flow paths are
                                        provided with capacity in accordance with IECA (2008) Table 4.3.1 and are
                                        structurally stable in all rainfall events for the following sources:
                                       a)   From stormwater catchments upslope of the area of disturbance which are
                                            either stable or external to the site, ensure stormwater is diverted or
                                            managed either:
                                            i.     around the site or through the site without causing erosion and
                                                   without contaminating the flow; or
                                            ii     if it is impractical to convey the flows around or through the site,
                                                   convey the flows into appropriately sized sediment basins without
                                                   causing erosion.
                                       b)   From all disturbed areas of the site to sediment basin(s) without causing
                                            erosion
                      c.      Minimise sediment released from the site
                               i.       Prior to each rainfall event ensure concentrated stormwater flow paths are
                                        provided with capacity in accordance with IECA (2008) Table 4.3.1 and are
                                        structurally stable in all rainfall events for the following sources:
                                       a)   Each basin is sized and operated in accordance with either a Type-A or
                                            Type-B sediment basin as documented in IECA (2008) Appendix B (June
                                            2018).
                                       b)   Each basin is to be provided with an automated system of flocculent dosing
                                            and a suitable supply of flocculent/coagulant, with the type of
                                            flocculent/coagulant determined based on Chemical Coagulants and
                                            Flocculants Fact Sheet (IECA, 2018).
                                       c)   Markers are provided within each basin indicating the maximum sediment
                                            storage level and any additional water storage capacity for water reuse.
                                       d)   During discharge from the primary outlet system, the concentration of total
                                            suspended solids (“TSS”) discharged does not exceed 50mg/L and that pH
                                            is within the range of 6.5-8.5 unless entering a naturally acidic environment.
                              ii.       Install and maintain additional sediment control measures within the site, as
                                        necessary to maximise sediment capture.


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Document Set ID: 24187118
Version: 9, Version Date: 04/12/2025