Reference Document - Geotech Report - MCU24 0094 · MCU24/0094

                               PROPOSED RESIDENCE
                               33 ROSS CRESCENT, SUNSHINE BEACH

1.0      INTRODUCTION
This report details results of a geotechnical investigation undertaken for a proposed residential development
at 33 Ross Crescent, Sunshine Beach. The investigation was carried out by Tectonic for 33 Ross Crescent
Pty Ltd, in accordance with our Proposal P24147-Rev0 dated 6 March 2024. Shaun Lockyer Architects
(SLA) are the architects and project managers for the development.
Haskoning Australia (RHDHV) are the coastal engineers for the project and have provided a coastal
engineering erosion cut profile, detailing the Erosion Prone Area associated with the coastal building line at
the subject site.
The geotechnical investigation comprised the drilling of three boreholes using a hand auger. Two boreholes
were advanced around an existing residence on site, with a third borehole at the toe of the high dune on the
seaward side of the site. In situ dynamic cone penetrometer (DCP) testing was also conducted adjacent and
within the boreholes and at three additional stand-alone locations. Geotechnical laboratory testing was
undertaken on selected soil samples.
This report presents the results of the geotechnical investigation and slope stability modelling to address
possible slope failure following a hypothetical future sea surge/storm event nominated by RHDHV, along with
geotechnical recommendations and comments for the proposed development in general.


2.0      PROPOSED DEVELOPMENT
Preliminary architectural drawings (Ref. Shaun Lockyer Architects, Job No. 0427, Dwg. No. 000.00 to
400.05 [not inclusive], revisions A to C, dated 17 June 2024) indicate that the existing residence would be
demolished and replaced with a multi storey residence over an expanded footprint. The upper levels will be
terraced down into the natural slope to the west, being taken to daylight in the east. The lower level and pool
will form a jutting terrace further to the east over a lesser footprint than the upper levels.

The swimming pool is indicated to mostly be above ground with the eastern end expected to be cantilevered.
Building construction is shown to consist of suspended concrete floors, concrete and masonry walls, full
height glazed facades and some timber cladding applied in select locations.

In order to construct the terraced residence, earthworks will be required comprising excavations of about
3.5 m depth for both the upper ground level and the lower level together with filling up to about 1.5 m high to
form platforms for slab edges and general landscaping. Deeper excavations may be required elsewhere as
part of the development (e.g. for underground services, lift pit and footings).
The proposed development is illustrated in Text Figures 1 to 3 below and overleaf.




Text Figure 1: Architectural rendering of the proposed development looking west (courtesy SLA)




18 June 2024
Report No. 24096-001-Rev0                                 1