2017-01-16 General Committee Agenda

GENERAL COMMITTEE MEETING AGENDA                                              16 JANUARY 2017


   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
   40.   Landscaping for the areas surrounding the bioretention basin filter media footprint must
         be arranged to minimise shading to the filter media footprint are. Suitable plants include
         the following:
         a.    Carex appressa
         b.    Carex fascicularis
         c.    Ficinia nodosa
         d.    Juncus usitatis
         e.    Lomandra longifolia
         f.    Ghania sieberiana
         g.    Banksia robur
         h.    Dianella brevipendunculata
         i.    Themada triandra
         j.    Cymbopogan refractus
         k.    Melaleuca thymifolia

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