Delegated Report - Code - Planning OPW24 0125 · OPW24/0125

                      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.
               41.    Sediment and erosion control measures must be in place prior to works commencing. If such
                      measures are not in place or are not satisfactory, “on the spot” fines may be issued. Such
                      fines can be issued if sediments from the site are found to enter or have the potential to enter
                      Council’s stormwater system, natural waterways, any downstream stormwater filtration
                      system or adversely impacting on other properties. The sediment and erosion control design
                      and measures have NOT been approved, it is the site's Supervising Engineer who is
                      responsible for ensuring that the sediment and erosion control measures have:
                      a.      been duly designed by an RPEQ or CPESC and constructed in accordance with "best
                              practise" methods;
                      b.      been revised by an RPEQ or CPESC to address the issues raised by changes in the
                              projected construction schedule and/or methods;
                      c.      been revised to address predicted rainfall events; and
                      d.      achieve the desired environmental outcomes.

                                                                                                          Page 14 of 19

Document Set ID: 23410526
Version: 6, Version Date: 14/01/2025