2016-07-18 General Committee Meeting Notes

RECOMMENDATIONS ONLY – NOT THE FINAL DECISION OF COUNCIL
GENERAL COMMITTEE MEETING                                                       18 JULY 2016


        Stormwater Drainage (Quantity & Quality)
        61.   A suitably qualified Registered Professional Engineer, specialising in hydraulics
              shall prepare engineering drawings and specifications for stormwater designs
              and shall be submitted in conjunction with an application for a Development
              Permit for Operational Works.
        62.   Stormwater pipelines within the site shall cater for 10% AEP storm event and
              secondary flow paths shall be provided within the site to cater for 1% AEP
              storm event.
        63.   The development must not adversely impact on the existing drainage conditions
              on other properties. The applicant must demonstrate that all stormwater runoffs
              from the fully developed site must be maintained at predevelopment rates for all
              storm events up and including 1% AEP storm event.
        64.   Stormwater runoff generated from the development must be treated to achieve
              the Water Quality Objectives as specified under Healthy Waterways Water
              Sensitive Urban Design – Technical Guidelines for South East Queensland
              (2006) as well as the State Planning Policy 2014 (SPP 2014) prior to release off
              site. For the purpose of this condition, treatment of waters from catchments B1
              and C1 as shown on Drawing B14158.W-SK100 A by Calbre Consulting, dated
              050/2/16 shall be considered as part of the development to determine mitigation
              requirements and load reduction targets.
              If detailed design demonstrates insufficient footprint is available for the water
              quality treatment devices to achieve the pollutant reduction targets of 80%
              reduction in Total Suspended Solids, 60% reduction in Total Phosphorous, and
              45% reduction in Total Nitrogen compared to an unmitigated development, the
              applicant must increase available space to ensure the water quality objectives
              can be achieved.
        65.   Stormwater Quality Treatment must be designed in accordance with the Water
              by Design MUSIC modelling Guidelines. Any deviation away from the
              recommendations of the Water by Design guidelines may only be approved
              where:
              65.1. letters signed by the authors of the Water by Design MUSIC modelling
                    guidelines and/or eWater MUSIC modelling program are provided to
                    confirm that the modelled design is expected to meet the required water
                    quality outcomes at the discharge point of the site; and
              65.2. a contingency plan to monitor for and to remove cyanobacterial and algal
                    outbreaks from waterbodies, including costs, is provided for approval with
                    the Operational Works application and the approved version is
                    implemented throughout the lifetime of the development. All stormwater
                    runoff treatment must be undertaken within the development areas of the
                    site. Stormwater likely to contain grease and oil (i.e. from all roads and
                    car parking areas) shall be managed via grease and oil arrestors prior to
                    treatment within bioretention basins, wetlands and water quality control
                    ponds.




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