2020-11-19 Ordinary Meeting Agenda

ORDINARY MEETING AGENDA                                                    19 NOVEMBER 2020


        Storm Water Quality
        81.   Any proprietary stormwater quality improvement device included to achieve the
              required stormwater quality Management Objectives specified in Section 4 of the
              Girraween Stormwater Management Plan, must demonstrate only be granted an
              Operational Works Approval on the following provisions:
              a.   A suitably qualified and experienced professional must provide independent
                   verification that the parameters within the node for the device in MUSIC
                   modelling have been tested and verified as per Stormwater Australia (2018)
                   Stormwater Quality Improvement Device Evaluation Protocol. Version 1.2
                   December 2018 to achieve the predicted outcomes in the MUSIC model for
                   the development. For the purpose of this condition, the suitably qualified and
                   experienced professional must be able to demonstrate a minimum 10 years
                   urban stormwater testing and modelling experience and be verified in writing
                   by Stormwater Australia as having an appropriate reputation and track record
                   within the stormwater industry to provide such independent advice.
              b.   Where testing to achieve the certification of the proprietary stormwater
                   quality improvement device is from an area with rainfall intensities and
                   patterns that are statistically inconsistent with the region of the Noosa Shire
                   that the device is to be installed, and / or the size of the development the
                   device has been tested on is more than 2500m2 smaller than the
                   development the device is proposed to service, the following additional
                   conditions apply:
                   i.    The proprietary stormwater device treatment train must be tested and
                         re-verified in accordance with the Stormwater Australia (2018)
                         Stormwater Quality Improvement Device Evaluation Protocol. Version
                         1.2 December 2018. A suitably qualified and experienced professional,
                         as verified by Stormwater Australia must use the results from the onsite
                         testing to re-run the MUSIC node for the proprietary devices and
                         confirm whether or not the required pollutant reduction efficiencies of
                         80% reduction in Total Suspended Solids, 60% reduction in Total
                         Phosphorous and 45% reduction in Total Nitrogen for the overall
                         development are delivered.
                   ii.   Where the field results and re-run MUSIC node demonstrate the
                         required pollution reduction efficiencies for the development are not
                         met, the applicant must implement additional measures to achieve the
                         required pollution reduction targets. The additional measures must
                         include, in order of priority, elevated maintenance, and then increased
                         treatment capacity of the stormwater quality improvement devices.
                         Following application of additional measures, the system must be
                         retested in accordance with Stormwater Australia (2018) Stormwater
                         Quality Improvement Device Evaluation Protocol. Version 1.2
                         December 2018. Where pollution reduction targets continue to not be
                         demonstrated the proprietary device must be removed and replaced
                         with a bio-retention device constructed in accordance with an
                         Operational Works approval or the applicant must enter into an
                         agreement with Council to provide improved water quality outcomes
                         within the catchment area.




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