Geotehnical Investigation Report · OPW22/0140

                              PROPOSED UNIT DEVELOPMENT
                              37 BOTTLEBRUSH AVENUE, NOOSA HEADS

1.0      INTRODUCTION
This report details the results of a geotechnical investigation undertaken for a proposed residential unit
development at 37 Bottlebrush Avenue, Noosa Heads. The investigation was performed by Tectonic at the
request of Bottlebrush Property, generally in accordance with Proposal P22114-Rev0, dated 22 February
2022. Recor Consulting are the structural engineers for the project.

The investigation comprised drilling of boreholes at three locations across accessible areas of the
development footprint. This report summarises the results of the investigation and provides geotechnical
recommendations regarding slope stability, earthworks and footings, together with advice regarding
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. PCA Architects, Project No. PCA2.21, Sheet
Nos. PL03 to PL17, dated 5 April 2022 & 21 April 2022). These plans indicate that the development will
comprise a three-storey building, over a single level basement carpark and living space. Construction will
likely 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, architectural plans indicate that
excavations for the lower ground floor would likely be in the order of about 4 m deep to the rear, daylighting
at the front. Localised filling less than 1 m high is 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 underground services and other elements.
Text Figure 1 below presents the basement layout plan and a cross-sectional view of the proposed
development.




Text Figure 1: Cross-sectional view (LHS) and basement layout plan (RHS), courtesy PCA Architects




13 May 2022
Report No. 22151-001-Rev0                                1