Reference Documents Plans - MCU24 0112 · MCU24/0112

                            Pollutant                                             Sources

                  pH altering substances           Acid sulphate soils, cement slurry and wash waters.

                 In addition to the degradation of receiving waters, impacts of inadequate erosion and sediment control
                 downstream from the site include:
                     •    traffic safety problems;

                     •    blocked drains;

                     •    local flooding problems;
                     •    aesthetic pollution of drainage paths; and

                     •    damage to local ecosystems.
                 4.3.1 De si gn O bj e ct i v es

                 Management of stormwater runoff during construction should be undertaken in accordance with
                 Appendix 2 of the SPP (July 2017). The SPP outlines the design objectives for construction phase
                 stormwater management. These are presented in Table 4, Table 5 and Table 6.

                 Table 4 – SPP Appendix 2: Part 1 Construction Phase – Stormwater Management Design Objectives

                              Issue            Desired Outcomes




                  Drainage Control             1. Manage stormwater flows around or through areas of exposed soil to
                                                  avoid contamination.

                                               2. Manage sheet flows in order to avoid or minimise the generation of rill or
                                                  gully erosion.

                                               3. Provide stable concentrated flow paths to achieve the construction
                                                  phase stormwater management design objectives for temporary
                                                  drainage works (part 2).

                                               4. Provide emergency spillways for sediment basins to achieve the
                                                  construction phase stormwater management design objectives for
                                                  emergency spillways on temporary sediment basins (part 3).

                  Erosion Control              1. Stage clearing and construction works to minimise the area of exposed
                                                  soil at any one time.

                                               2. Effectively cover or stabilise exposed soils prior to predicted rainfall.

                                               3. Prior to completion of works for the development, and prior to removal
                                                  of sediment controls, all site surfaces must be effectively stabilised
                                                  using methods which will achieve effective short-term stabilisation.

                  Sediment Control             1. Direct runoff from exposed site soils to sediment controls that are
                                                  appropriate to the extent of disturbance and level of erosion risk.
                                               2. All exposed areas greater than 2500 metres must be provided with
                                                  sediment controls which are designed, implemented and maintained
                                                  to a standard which would achieve at least 80% of the average annual
                                                  runoff volume of the contributing catchment treated (i.e. 80%

                                                                                                                              5
Document Set ID: 23352733
Version: 1, Version Date: 15/11/2024