Decision Notice - OPW23 0189 [As Published] · OPW23/0189

                      Earthworks and Retaining Walls
               18.    All earthworks and associated retaining structures/batters, both above and below ground
                      level, both temporary and permanent, must be contained entirely within the subject site
                      unless written permission from the respective landowner(s) is provided to Council.
               19.    All earthworks shall be undertaken in accordance with the provisions of AS 3798 Guidelines
                      on Earthworks for Commercial and Residential Development, with geotechnical testing
                      undertaken in accordance with Section 8 of the Standard, and to a minimum of ‘Level 2’ as
                      defined in Appendix B. Test results as required by AS 3798.
               20.    All excavation and dewatering works must be undertaken in accordance with the
                      recommendations provided by ADG Consulting’s Dewatering Management Plan
                      (ADG1580.23, Rev. 0) dated 28 September 2023 and in a manner that will not cause
                      environmental harm or damage to surrounding infrastructure or property as a result of the
                      developments interaction with actual or potential Acid Sulphate Soils or groundwater.
               21.    All excavated material must be treated for Acid Sulfate Soils generally in accordance with
                      the recommendations provided by Pacific Geotechnical’s Acid Sulfate Soil Investigation
                      Report (PG-10899, Ver. 3) dated 28 November 2023.
                      Treated material must undergo verification testing at the rate of one sample per 250m3
                      throughout the duration of the excavation phase of the development. The verification testing
                      must be undertaken by a qualified person in accordance with the Queensland Acid Sulfate
                      Soil Technical Manual: Soil Management Guidelines v4.0, and the results must be submitted
                      to Council for appraisal when requested during construction and prior to commencement of
                      use and must demonstrate that the material has been adequately neutralised.
                      Certification of the verification results for compliance with this condition must be provided by
                      a suitably qualified Geotechnical Engineer prior to the issuing of the certificate of
                      classification for the dwelling.
               22.    Fall protection must be provided to retaining walls that are over 1m high.
               23.    Slope and batters are a maximum grade of:
                      a.      1 in 6 where in proximity to waterbodies;
                      b.      1 in 4 for grassed areas;
                      c.      1 in 3 for planted areas; and
                      d.      1 in 2 for combined structural engineering and planting solutions.
                      Stormwater Drainage
               24.    Appropriate scour protection must be provided at the outlet of all stormwater pipes including
                      temporary outlets.
               25.    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).
               26.    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.
                      Erosion and Sediment Control
               27.    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.




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Document Set ID: 22828321
Version: 3, Version Date: 27/02/2024