Attachment D - Stormwater Report · MCU18/0013

4. Water Quality Management

       4.1                 Operational Phase
      The development is not required to meet the Queensland Governments State Planning Policy (July 2017) as
      the site does not exceed the 2,500m 2 minimum site area. However stormwater quality management must still
      be undertaken via the application of best management practices (BMPs) to ensure no adverse impacts to the
      downstream environment.

      Pollutants typically generated during the operational phase of the development include:

                     litter/gross pollutants
                     sediment (Total Suspended Solids – TSS)

                     nutrients (Total Nitrogen and Total Phosphorus – TN & TP)

                     hydrocarbons (oils and grease)
                     heavy metals

      Stormwater quality best management practices may be implemented for the development as follows:

                    First flush diversion system for roof water diverting the roof water for irrigation purposes
                    Gross pollutant filter baskets in field inlet pits collection runoff from ground areas.

      As the site is classified as a ‘low risk’ development the listed best management practices have been deemed
      sufficient for the site area and use. Refer to Appendix B for the stormwater management drawing.

       4.2                 Construction Phase
      Pollutants typically generated during construction phase are described in Table 4 below.
       Table 4 - Pollutants typically generated during the construction phase

                          Pollutant                                                     Sources

        Litter (Gross Pollutants)                    Paper, construction packaging, food packaging, cement bags.

        Sediment                                     Unprotected exposed soils and stockpiles during earthworks and
                                                     building.

        Hydrocarbons                                 Fuel and oil spills, leaks from construction equipment.

        Toxic materials                              Cement slurry, asphalt prime, solvents, cleaning agents, wash waters.

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



5. Erosion and Sediment Control

      Management of stormwater runoff during construction is necessary to avoid pollution of downstream
      waterways from sediment and gross pollutant loading. Impacts of inadequate erosion and sediment control
      downstream from the site include:
                                     traffic safety problems;

                                     blocked drains;

                                                24 Arakoon Street, Sunshine Beach QLD 4567
Job No – S18-003                                   STORMWATER MANAGEMENT REPORT                                          7