2017-01-16 General Committee Meeting Notes

RECOMMENDATIONS ONLY – NOT THE FINAL DECISION OF COUNCIL
GENERAL COMMITTEE MEETING                                                   16 JANUARY 2017


              b.   demonstrate that appropriate detention is provided to not increase peak
                   flow runoff from the site in a Q1, 5, 50 and 100 year event. The appropriate
                   detention infrastructure must be installed in accordance with those
                   drawings.
        34.   Prior to the commencement of use, the supervising RPEQ must certify that all
              hardstand areas of the development drain to necessary detention tanks as well
              as a bioretention device designed and constructed in accordance with all relevant
              conditions of this approval, the Water by Design Bioretention Technical Design
              Guidelines, relevant aspects of the IPWEAQ Standard Drawing WSUD-drawing
              series and Construction and Establishment Guidelines: Swales, Bioretention
              Systems and Wetlands (Water by Design, 2009).
        35.   During construction and establishment of the bioretention devices, the
              supervising RPEQ must certify forms contained in section 3.15 of the
              Construction and Establishment Guidelines: Swales, Bioretention Systems and
              Wetlands (Water by Design, 2009). These forms and certification must be
              submitted to council prior to the sealing of the survey plan.
        36.   A construction hold point must be established with a council delegate once the
              bioretention device underdrainage pipe work is installed. At the time of
              inspection, a sample of the drainage layer, transition layer, and filtration media
              materials must be stockpiled onsite accompanied by laboratory results that
              demonstrate that the media complies with the specifications contained in the
              latest version of the Guidelines for Soil Filter Media in Bioretention Systems
              (Facility for Advancing Water Biofiltration) and that the minimum hydraulic
              conductivity of 180mm/hr or as specified on the approved engineering plans will
              be achieved. The drainage layer, transition layer, and filtration media materials
              shall not be installed until the catchment draining to the bioretention device has
              80% groundcover as determined by council’s delegate.
        37.   Eighty per cent (80%) of the catchment flowing to the bioretention basin must be
              effectively stabilised prior to the construction hold point for the Bioretention
              device.
        38.   Following the commencement of use, the bioretention devices must be regularly
              maintained in accordance with the Water By Design Maintain Vegetated Assets
              Guideline. Records of all maintenance activities must be retained on site for 5
              years and made available to Council Officers on request.
              Bioretention Devices - Landscaping
        39.   Landscaping must include a mixture of at least five of the following species for
              planting in the bioretention basin extended detention surface at a minimum
              density of 8 plants/m²:
              a.   Carex appressa
              b.   Carex fascicularis
              c.   Ficinia nodosa
              d.   Juncus usitatis
              e.   Lomandra longifolia
              f.   Ghania sieberiana



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