2015-01-15 Ordinary Meeting Agenda

ORDINARY MEETING AGENDA                                                      15 JANUARY 2015


        32.   A construction hold point with a council delegate must be established once the
              contributing catchment is effectively stabilised with at least 80% groundcover,
              and bioretention device underdrainage pipe work is installed.
        33.   At the time of the construction holdpoint, 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.
        34.   The bioretention underdrains and cleanout points must be provided as uPVC
              pipe generally as shown on IPWEAQ Standard DrawingWSUD-003.
        35.   Where the bioretention filter media interfaces with stormwater pits and retaining
              walls, nonwoven geotextile must be fixed to the pit/retaining wall and extend
              300mm out into the filter media generally in accordance with IPWEAQ Standard
              Drawing WSUD-001 to prevent tunnelling of water along the interface.
        36.   All overflow pits within the bioretention devices must be provided with letterbox
              type grates in accordance with IPWEAQ Standard Drawing WSUD-001.
        37.   A minimum of five of the following species must be planted in the bioretention
              basin surface at a minimum density of 8 plants/m2:
              a.    Carex appressa.
              b.    Carex fascicularis.Ficinia nodosa.
              c.    Juncus usitatis.
              d.    Lomandra longifolia.
              e.    Ghania sieberiana.
        38.   Where landscaping/garden beds are proposed adjacent to the bioretention
              basin, a 900mm deep root barrier must be installed to the interface between the
              landscape/garden area and the bioretention basin.
        39.   Following Construction - Prior to issuing of a final compliance certificate, council
              must receive evidence that the results for the in situ hydraulic conductivity
              testing conducted in accordance with PRACTICE NOTE 1: In Situ
              Measurement of Hydraulic Conductivity (FAWB, April 2008) for the bioretention
              filter media achieve the design criteria.
        40.   Maintenance - All stormwater quality treatment devices must be maintained in
              accordance with the Maintaining Vegetated Stormwater Assets, Version 1
              (Water by Design, 2009). Records of all maintenance activities undertaken
              must be kept and made available to council upon request.
              Erosion and Sediment Control
        41.   Erosion and sediment control measures must be installed and maintained to
              minimise erosion on the site and to minimise the export of sediment and
              associated pollutants from the site. The erosion and sediment control measures
              must be designed, installed and maintained in accordance with current best
              practice standards.* Any waters discharged from the site in a 43mm rainfall
              event or less must contain less than 50mg Total Suspended Solids per Litre.
              (*refer to advisory notes)




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