Attachment 2 - Existing Approval

                                       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), based on the contributing catchment area including undisturbed
                                            catchments which cannot be diverted;
                                       B.   each basin is to be provided with an automated system of flocculant dosing
                                            and a suitable supply of flocculant/coagulant, with the type of
                                            flocculant/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 6.5-8.54. These discharge standards apply equally to
                                            any intentional release of any water captured or stored within the site;
                                       E.   The hydraulic structures such as inlets, outlets, spillways must be
                                            structurally sound for the design events as specified in IECA (2008); and
                                       F.   The sediment basin is to be constructed and operational before any
                                            disturbance occurs in the catchment upslope of the basin. Accumulated
                                            sediment from basins and other controls is to be removed and disposed of
                                            appropriately without causing water contamination.
                              ii.      For site sub-catchments less than 2,500m2 in area and where it is not feasible to
                                       divert runoff from these small disturbed areas of the site to a sediment basin,
                                       compensatory erosion and sediment controls are implemented prior to rainfall to
                                       ensure that erosion of those of areas is minimised and Type 2 or Type 3 sediment
                                       controls are provided in accordance with IECA (2008).
                              iii.     Controls are to be installed to minimise the tracking of dirt from the site onto
                                       roadways. Any dirt on roadways caused by vehicles leaving the site is to be
                                       removed without causing water contamination, prior to rainfall and at least at the
                                       end of each work day.
                      d.      Manage works within waterways
                              i.       Waterways, including perennial and permanent waterways, are not to be altered,
                                       nor riparian (including rehabilitated) vegetation disturbed without prior written
                                       approval of the relevant administering authority.
                              ii.      Work within waterways is to be:-
                                       A.   only undertaken during the lower rainfall months;
                                       B.   promptly rehabilitated conforming to the natural channel form, substrates
                                            and riparian vegetation as far as possible; and
                                       C.   undertaken in accordance with Best Practice Erosion and Sediment
                                            Control, Appendix I – Instream works, Sections 14 and 16, (International
                                            Erosion Control Association, 2008).
                              iii.     Temporary vehicular crossings of waterways are to be designed and constructed
                                       to convey flows for the 63%AEP and remain stable for all rainfall events up to the
                                       10% AEP event of critical duration.
                              iv.      ESCs are not to be constructed within the riparian buffer zone, unless it is not
                                       feasible to site them elsewhere, and then only within cleared areas.
               5.     REFERRAL AGENCIES

               Not applicable.




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Document Set ID: 23876458
Version: 4, Version Date: 09/07/2025