ECM_22343520_v1_Geotechnical Investigation · 132000.200173.1

                                           PROPOSED RENOVATIONS
                                           2 ARAKOON CRESCENT, SUNSHINE BEACH




            Text Figure 11: Geological model of the site and high dune, including extreme storm event scenario

            Although the extreme storm case does not appear to impact the subject site, and an applied 28 line from the
            dune toe does not intersect the ground surface, to assess the FOS against instability for the proposed
            development numerical modelling has been undertaken considering the existing dune slope.

            A surcharge load of 5 kPa was applied across the site and crest of the dune to the eastern boundary to
            replicate future landscaping. Building loads for the proposed residence and ancillary structures will be
            transferred by a piled footing system into the natural medium dense (or denser) sands at depth and will not
            surcharge the ground surface, thus have not been included in the models.

            Soil shear strength was based upon effective parameters which were estimated based on our interpretation
            of the subsurface investigation results, while also considering the values recommended for similar materials
            in Appendix D of Australian Standard AS4678-2002 Earth Retaining Structures. Adopted soil parameters
            are shown on the Slope/W output presented in Text Figure 12 overleaf. Analysis was undertaken for a
            specified range of entry and exit points that could impact the proposed development.




             24 February 2023
             Report No. 22484-001-Rev0                                12
Document Set ID: 22343520
Version: 1, Version Date: 16/03/2023