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

1.          Introduction
This report details results of a geotechnical investigation undertaken for a proposed residential
development at 17 The Esplanade, Sunshine Beach. The investigation was carried out by Tectonic for
Christian Seymour, in accordance with our Proposal P25454-Rev0 dated 8 September 2025. Adapt
Planning are the town planners for the development.
Moffat & Nichol (M&N) are the coastal engineers for the project and have provided a coastal erosion
‘cut’ profile which could affect the subject site.
The geotechnical investigation comprised the drilling of two boreholes using hand auger equipment,
located at the eastern property boundary and in the western part of the site. In situ dynamic cone
penetrometer (DCP) testing was also conducted adjacent to and within the boreholes, and at three
stand-alone locations. Geotechnical laboratory testing was undertaken on one select soil sample.
This report presents the results of the geotechnical investigation and slope stability modelling, to address
possible slope instability following coastal erosion from a hypothetical future sea surge/storm event
assessed by M&N, along with geotechnical recommendations for the proposed development in general.



2.          Proposed Development
Architectural drawings prepared by Aboda Design Group (Ref. ADG, Project No. NSS032, Dwg. Nos.
WD.101 to WD.603 [not inclusive], Rev A, dated 27 June 2025) indicate that a three-storey residence is
proposed.
The basement level would be ‘dug in’ to the slope, ‘daylighting’ to the east and being completely below
ground to the west (~3.5 m below existing ground levels). A full central level would be present above,
with a partial third level, allowing for open, elevated courtyard and terraces. Building construction is
shown to consist of suspended concrete floors, concrete and masonry walls, full height glazed facades
and some lighter weight cladding in select locations. A below ground pool would be constructed along
the northern side of the allotment, with the floor of the pool shell being up to about 3 m below existing
ground levels.
In order to construct the basement level of the residence (and the pool), earthworks will be required
comprising excavations of up to about 4 m depth, with some possible minor filling of up to about 0.5 m
high to form platforms for slab edges and general landscaping. Deeper excavations may be required for
underground services and footings.
Extracts from the proposed development plans are illustrated in Text Figures 1 overleaf.




Geotechnical investigation
19 November 2025 | 25289-001-Rev0                                                                           1