Stormwater Management Report · MCU19/0008

         aesthetic pollution of drainage paths; and
         damage to local ecosystems.
4.2.1 Desi g n O b j ecti ves

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 5, Table 6 and Table 7.
Table 5 – 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%
                                 hydrological effectiveness) to 50mg/L Total Suspended Solids (TSS) or
                                 less, and pH in the range (6.5–8.5).

 Litter, Hydrocarbons and      1. Remove gross pollutants and litter.
 other contaminants
                               2. Avoid the release of oil or visible sheen to released waters.
                               3. Dispose of waste containing contaminants at authorised facilities.




4 April 2019                             Stormwater Management Report                                         11
S18-030                                     22 Arakoon Crescent,