Delegated Report - Code - Planning OPW25 0042 · OPW25/0042

                      c.      1 in 3 for planted areas; and
                      d.      1 in 2 for combined structural engineering and planting solutions.
                      Stormwater Drainage
               33.    Appropriate scour protection must be provided at the outlet of all stormwater pipes including
                      temporary outlets.
               34.    Works associated with this permit must not adversely impact on the existing drainage
                      conditions on other properties (e.g., by blocking or interfering with natural overland flows).
               35.    Construction of all internal stormwater drainage works must comply with the relevant
                      section/s of Australian Standard AS/NZS 3500.3.
               36.    Prior to the completion of the development, all site surfaces must be effectively stabilised
                      using methods which have achieved effective short-term stabilisation, and which will continue
                      to achieve effective stabilisation in the medium- to long-term (refer to E&SC Advisory Notes).
                      For the purpose of this condition, an effectively stabilised surface is defined as one that does
                      not or is not likely to result in visible evidence of soil loss caused by sheet, rill or gully erosion
                      or lead to sedimentation, or lead to water contamination.
                      Bioretention Basins – Construction
               37.    During construction and establishment of the bioretention devices, the supervising RPEQ
                      must ensure that the device was constructed in accordance with the document Construction
                      and Establishment Guidelines: Swales, Bioretention Systems and Wetlands (Water by
                      Design, 2009) and that the forms contained in section 3.15 including the associated
                      supporting information and data are completed. These forms and certification from the RPEQ
                      that the device has been constructed in accordance with the Construction and Establishment
                      Guidelines: Swales, Bioretention Systems and Wetlands (Water by Design, 2009), all
                      conditions of approval, and the approved engineering drawings must be submitted to Council
                      prior to commencement of use.
               38.    A construction hold point with a council delegate shall be established 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.
                      Laboratory results must be provided for the filter media which demonstrate that the media
                      complies with the specifications contained in the latest version of the “Guidelines for Soil
                      Filter Media in Bioretention Systems” (produced by the Facility for Advancing Water
                      Biofiltration) and that the minimum hydraulic conductivity specified on the approved
                      engineering plans will be achieved. In addition, laboratory results must be provided
                      demonstrating that the transition layer and drainage layer meet the following bridging criteria:
                      a.      D15 (drainage layer) ≤ 5 × D85 (transition layer)
                      b.      D15 (transition layer) ≤ 5 × D85 (filter media).
                      The drainage layer, transition layer, and filtration media materials must not be installed until
                      the catchment draining to the bioretention device has 70% groundcover as determined by
                      Council’s delegate.
                      Erosion and Sediment Control
               39.    Prescribed Water Contaminants (as defined in Schedule 10 of Environmental Protection
                      Regulation 2019) must not be released from the site or to waters within the site, or be likely
                      to be released should rainfall occur, unless all reasonable and practicable measures are
                      taken to prevent or minimise the release and concentration of contamination. These
                      measures must be designed, implemented and maintained in accordance with “Best Practice
                      Erosion and Sediment Control” published by the International Erosion Control Association
                      (Australasian Chapter) (IECA, 2008), to the extent that such measures and practices are also
                      consistent with the following:
                      a.      Minimise Erosion:

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Document Set ID: 23831232
Version: 12, Version Date: 12/08/2025