Delegated Report - Code - Planning OPW25 0042 · OPW25/0042

                              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.
                              iii.      Minimise the tracking of dirt from the site onto roadways. Ensure that all dirt on
                                        roadways caused by vehicles leaving the site is removed without causing water
                                        contamination, prior to rainfall and at least at the end of each work day.

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Document Set ID: 23831232
Version: 12, Version Date: 12/08/2025