Decision Notice - Minor Change - OPW19 0203 03 [As Published] · OPW19/0203.03

               Bioretention Devices – General
               38.    Raingarden 1 and Raingarden 2 are to be provided with pool fencing along the interface of
                      the raingarden and road reserve. All raingardens are to additionally be provided with pool
                      fencing at location where the retaining wall height exceeds 1m.
               39.    Deleted.
               Bioretention Devices – Landscaping
               40.    Landscape plants to the filter material surface area must be established as per the approved
                      plans where sufficient media depth of a minimum of 700mm is provided to support tree
                      species. Where less than 700mm of filter material, the macrophytes listed in the approved
                      plans must be established at a density no less than 8/m2.
               41.    Landscaping to the surface of the bioretention basin filter media area must not commence
                      until 80% of building work within each contributing catchment is complete or after 3 years,
                      whichever occurs first. An uncompleted works bond of 150% of the value of the planting to
                      the surface of the bioretention basin filter media area must be provided to Council prior to
                      the release of the Plan of Survey.
               42.    Landscaping to the batters and biorention basin filter media must be maintained in good
                      conditions by the developer until the planting to the surface of the bioretention basin filter
                      media is accepted off-maintenance by Council.
               43.    Where landscaping/garden beds are proposed adjacent to the bioretention basin, or where
                      the basin is located adjacent to naturally forested areas, a 900mm deep root barrier must be
                      installed to the interface between the landscape/garden/forest area and the bioretention
                      basin to prevent root intrusion to the biobasin infrastructure.
               44.    Where required, mulch within the batters of bioretention basins must be installed in a manner
                      that it will not escape into receiving stormwater drainage infrastructure or water courses.
               Bioretention Devices – Education
               45.    The development must be provided with approved permanent signage to educate the public
                      on the function of the bioretention basin. The wording for the signage for each bioretention
                      basin is to include: “BIORETENTION BASIN - This bioretention basin improves water quality
                      entering Lake Doonella wetlands by filtering out pollutants.”
               Bioretention Devices – Maintenance
               46.    All stormwater quality treatment devices must be maintained in accordance with the Water
                      by Design (2009) Maintaining Vegetated Stormwater Assets (Version 1). The approved
                      Operational Works drawings for the stormwater quality treatment system and detailed life
                      cycle costing of the system must be attached as an addendum to this document. Records of
                      all maintenance activities undertaken must be kept and made available to Council upon
                      request.
               Retention of Existing Trees and Vegetation
               47.    All trees and vegetation identified for retention must be protected in accordance with AS
                      4970, Protection of trees on development sites.
               48.    Vegetation areas (north and north eastern corner) for protection must:
                      a.      Be protected with a 1.8m high temporary safety fence or temporary barrier mesh /
                              three-strand wire with pickets at 3m centres.
                      b.      Have the fence installed prior to the prestart meeting and maintained for the entire
                              period of construction.
                      c.      Have ‘Exclusion Zone’ signage fixed to the fence at 10m centres.
                      d.      Have no construction material, equipment or personnel entering the exclusion zone
                              except to undertake approved rehabilitation activities.



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Document Set ID: 22809336
Version: 4, Version Date: 13/02/2024