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

                                                             Minor cracking noted in
                                                             rendered structures




                                       Text Figure 5: Oblique drone image of the site, looking east


        4.2             Topography
        During our site walk-over, topographic features specific to the site were noted, and ground slopes were
        recorded using a hand-held clinometer. As illustrated in Text Figure 6 overleaf, the site is located just
        above the crest, and over the upper face, of the high dune backing Sunshine Beach. The stoss face of the
        dune is generally eastward facing at the site location.
        The inferred natural ground slope was generally consistent through the site, at about 8° to the east.
        However, the site had been altered by historic cut and fill earthworks associated with construction of the
        existing residence, which had formed level areas connected via stairs and retaining walls. In the area
        immediately to the east of the site, along the road area, the ground was near flat and appeared to have
        been formed by filling works estimated to be up to 1 m in height. Approximately 3 m to the south-east
        of the property boundary, this fill was retained by a 0.6 m high timber sleeper retaining wall in poor
        condition. The remainder of the abovementioned fill, which formed a near level area extending between
        5 m and 10 m east of the site, was graded down to the natural slope. This then transitioned to the top of
        the dune slope, with a prominent break in slope over the main dune face which had an overall gradient
        of around 30°. At about midway down the dune slope, the slope angle increased to between 30° and 37°,
        but was still generally planar in shape.
        At the toe of the high dune a trough was present, of around 5 m width. The frontal dune running along
        the back of the main beach area was about 1 m height and undulating. Beyond this, the beach dropped
        down from about RL 3 m AHD to the shoreline (around RL 0 m AHD).




        Geotechnical investigation
        19 November 2025 | 25289-001-Rev0                                                                       6
Document Set ID: 24631529
Version: 1, Version Date: 24/03/2026