MCU25 0087 - Reference Document - Geotech assessment report (As Published) · MCU25/0087

        Table 3: Details of Qualitative Risk Assessment for Property (AGS 2007)
          Hazard                       Likelihood    Consequence   Assessed Risk   Comments

                                                                                   Given the low natural gradients through the
          Failure through very                                                     proposed building areas and retention
          loose to loose natural                                                   system proposed, it is considered Unlikely
          sands and sand fill                                                      that a landslide in these materials would
                                          Unlikely     Medium           Low
          above the foundation                                                     affect the proposed development. For a
          depth in future                                                          potential Medium impact from such
          building areas                                                           instability the resultant risk would be Low as
                                                                                   per AGS 2007.

                                                                                   The likelihood of a deep failure through the
                                                                                   medium dense (or denser) natural sand
                                                                                   below the proposed foundation depth is
          Deep failure through                                                     assessed as Rare due to the lack of
          the medium dense (or                                                     precedence of such movements locally, no
                                            Rare        Major           Low
          denser) sands below                                                      signs of any existing slope instability and a
          the foundation depth                                                     lack of groundwater. Although the
                                                                                   consequence of such a failure would be
                                                                                   Major, the resultant risk is Low as per AGS
                                                                                   2007.

                                                                                   The likelihood of failure of a temporary
                                                                                   retention system, if required as outlined in
                                                                                   Section 6.3, is assessed as Unlikely, subject
          Instability of
                                                                                   to detailed design by a suitably qualified
          temporary shoring
                                                                                   RPEQ engineer, which accounts for the
          system (if required), as        Unlikely     Medium           Low
                                                                                   required factors of safety against slope
          discussed in
                                                                                   instability, and construction by a specialist
          Section 6.3.
                                                                                   contractor. Although the consequence of
                                                                                   such a failure could be Medium, the
                                                                                   resultant risk is Low as per AGS2007.

                                                                                   While the modelling indicates it is Possible
                                                                                   that an extreme erosion event could affect
                                                                                   the site, the likelihood of a landslide
          Retrogressive failure
                                                                                   extending through the future piled wall
          of the high foredune
                                                                                   system along the eastern edge of the site
          face considering
                                                                                   boundary as outlined in Section 6 is assessed
          potential future
                                                                                   as Rare, subject to detailed design by a
          erosion from a                    Rare        Major           Low
                                                                                   suitably qualified RPEQ engineer,
          hypothetical storm
                                                                                   construction by a specialist contractor, and
          and wave scenario,
                                                                                   considering the results of our quantitative
          impacting the subject
                                                                                   slope stability analysis outlined in Section
          site.
                                                                                   5.2.1. Although the consequence of such a
                                                                                   failure would be Major, the resultant risk is
                                                                                   Low as per AGS2007.



        The potential impacts on slope stability of the development components have been assessed, and the
        measures recommended below in Section 6 have been designed to mitigate those impacts.




        Geotechnical investigation
        19 November 2025 | 25289-001-Rev0                                                                                          12
Document Set ID: 24631529
Version: 1, Version Date: 24/03/2026