Reference Document - MCU26 0001 & OPW26 0002 - AS PUBLISHED · MCU26/0001

        4.2              Topography
        As illustrated in Text Figure 6 below, the site is located on the south-westerly facing flank of an ancient
        sand dune, which crests about 200 m to the east/north-east. During the walk-over, topographic features
        specific to the site were noted, and ground slopes were recorded using a hand-held clinometer.
        The natural surface profile had been interrupted by historic landscaping and residential construction;
        with inferred unaltered ground slopes along the side boundaries measured at the time of our assessment
        of about 10°. Based on our observations it appeared that cut and fill earthworks of up to about 1.5 m
        depth/height had been undertaken across the site. To the rear of the residence the ground surface was
        gently sloping, typically being less than 3°, and supported by timber sleeper walls about 0.5 m high. The
        front of the property comprised a gently sloping carparking area, being less than 5°, with the driveway
        continuing down to Bottlebrush Avenue at about 12°.
        Generally, no irregular surface features were noted which would indicate global slope instability.




                                                 Subject Site




                          Text Figure 6: Plan showing ground surface contours (courtesy NC ‘Intramaps’)


        4.3              Geology
        Available geological information 1 indicates that the site is underlain by Pleistocene age blowout dunes
        comprising “quartz sand.” An extract of the relevant geological mapping is shown in Text Figure 7
        overleaf.




        1
            Queensland Government, Department of Mines and Energy, 1:100,000 Laguna Bay Surface Geology Map, Sheet 9545, 11 July 2018


        Geotechnical Investigation
        30 January 2026 | 25408-001-Rev0                                                                                                5
Document Set ID: 25158026
                  24528612
Version: 1,
         2, Version Date: 10/09/2026
                          13/02/2026