Appendix C - Stormwater Management Plan

TfA Project Group Pty Ltd                                                                      Stormwater Management Plan
                                                                                                    Development Application


   8.1         Maintenance Plans for Stormwater treatment devices
   All stormwater quality improvement systems require regular maintenance in order to function adequately. Table 18
   details the basic maintenance requirements for each type of stormwater quality improvements systems. A detailed
   maintenance schedule will be developed as part of the detailed design of the site.


   Table 20: Maintenance Requirements

       Control                  Maintenance Requirement                                           Maintenance Period
       Spel®                    Remove sediment and captured litter                               4 months (inspect after
       Stormsacks
                                                                                                  major storms)
       Spel® Puraceptor         Replacement of oil separators and coalescer units, removal of     6 Months       (inspect after
                                oil, sediment & gross pollutants (skimmers and vacuum truck)      major spill)
       Onsite Detention         Removal of accumulated sediment, debris                           6 Months (inspect after
       Basin                                                                                      major storms)


   For operational and maintenance guidelines refer to Appendix G and relevant manufacturer’s documentation.


   9      LIFECYCLE COSTS


   A lifecycle cost analysis is not part of the scope of this report. All the recommended water quality treatment
   infrastructure lies within the development site and it shall be maintained and serviced by the owners of the
   development at no cost to Council.



   10     CONCLUSION


   A Site Based Stormwater Management Plan has been prepared with respect to the proposed service station and
   retail. The location of the site is shown on Figure 1 and the proposed development site layout is shown in
   Appendix A.


         •      Stormwater Quantity
                An assessment of the water quantity has resulted in an onsite detention basin size of 38,400L with
                controlled outlet to mitigate the peak discharge and achieve “no worsening” of stormwater conditions
                external to the site. The detention storage volume is based on preliminary calculations; the actual
                detention storage volume required and outlet arrangement will be determined by appropriate software
                as outline in section 5.05.2 of QUDM (2007).


         •      Stormwater Quality- Construction Phase
                An Erosion and Sediment Control Plan aimed at minimising unacceptable impacts during the
                construction phase will be developed at the Operational Works stage, in accordance with Noosa Council
                Guidelines and Standards.


         •      Stormwater Quality- Operational Phase
                It is proposed to treat runoff from the surface of the site by using Spel® Stormsacks or similar approved
                devices. The location of proposed treatment measures is shown in Appendix E.



                            123 Eumundi Road (Cnr Walter Hay Drive), Noosaville QLD 4566                                Page 13