20220109 - Geotech · OPW23/0182

                              PROPOSED RESIDENCE
                              21 MAHER TERRACE, SUNSHINE BEACH

1.0      INTRODUCTION
This report details the results of a geotechnical investigation undertaken for the proposed multi-storey
residence at 21 Maher Terrace, Sunshine Beach. The investigation was performed by Tectonic for Libby &
Greg Baynton, generally in accordance with Proposal P21322-Rev0, dated 3 June 2021. Kelder Architects
(Kelder) are the consulting architects for the project.

The investigation comprised drilling of boreholes at two locations across accessible areas of the
development footprint, together with in-situ strength and laboratory testing. This report summarises the
results of the investigation and provides geotechnical recommendations regarding earthworks and footings,
together with temporary and permanent basement retention.

In summary, subject to the implementation of the recommendations made herein, it is assessed that there
would be a Low Risk of slope instability affecting the proposed development in accordance with the
Australian Geomechanics Society “Guidelines for Landslide Risk Management”, dated March 2007 (AGS
2007).

2.0      PROPOSED DEVELOPMENT
Preliminary architectural drawings were supplied to us (Ref. Kelder, Project No. 2008, Drawing Nos.
SD_0021 to SD_3000 [not inclusive], Rev A-B, dated 22 April 2021. These plans indicate that development
of the site will comprise the demolition of the existing residence and pool followed by construction of a two-
storey building, over a single level basement carpark. Construction will include a combination of masonry
and lightweight materials (e.g. weatherboard cladding to walls etc.) and suspended concrete floors.
No earthworks details were provided at the time of reporting; however, provided plans indicate that
excavations for the basement would likely be in the order of about 4 m deep in the rear with the cut
daylighting at the front. Localised filling less than 1 m high anticipated. Excavations will extend close to the
site boundaries and therefore, some form of temporary retention will be required. Isolated deeper
excavations may be required for the lift overrun pit and other elements.
Text Figure 1 below presents a layout plan and cross-sectional views of the proposed development.




Text Figure 1: Layout plan (LHS) and cross-sectional views (RHS) of proposed development, courtesy of Kelder




16 July 2021
Report No. 21236-001-Rev0                                 1