25289-001-Rev0 - The Esplanade (1)-compressed

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