Geo-environmental Investigation · MCU25/0020

1.           Introduction
This report details the results of a geotechnical and acid sulfate soils (ASS) investigation undertaken for a
proposed residence at 11 Ravenwood Drive, Noosa Heads. The investigation was performed by Tectonic
for Sunshine Beach Noosa Developments Pty Ltd, generally in accordance with Proposal P25064-Rev0
dated 7 February 2025.
The investigation comprised a site walkover and drilling of boreholes at two locations, in situ soil
strength testing and environmental laboratory testing. This report summarises the results of the
investigation and provides geotechnical recommendations regarding earthworks, footings, temporary
and permanent retention and groundwater management, together with an assessment of the extent and
severity of ASS.



2.           Proposed Development
Architectural drawings supplied to Tectonic (Ref. Chris Clout Design [CCD], Project Name. River Oasis,
Sheet Nos. C0.0 to C5.3 [16 sheets], Issue Preliminary Concept, dated 14 February 2025) indicate that the
proposed new residence will comprise a two-storey building over a single level basement. Construction
will likely comprise rendered masonry, with suspended concrete upper floors and roof. An arc shaped
pool will be positioned adjacent to the lower floor level in the north-eastern corner of the site, being
setback about 2 m from the existing canal revetment wall. Concrete steps are also proposed off the
eastern edge of the house down to the revetment wall. Plans suggest that a jetty is also proposed as
part of the works.
Civil drawings prepared by SCG Consulting Engineers (SCG, Ref. Drawing Nos. 0280, Various Sheets,
dated February 2025) indicate that excavations for the basement level will generally range between
about 3 m and 4 m deep, however, isolated deeper excavations ranging up to about 4.5 m deep are
expected for a car lift pit. Excavations for the pool are indicated to range up to about 1.5 m deep, with
no filling proposed across the site. It is understood that contiguous piles are proposed around the full
perimeter of the basement.
Preliminary information provided by SCG indicates that serviceability loads beneath the basement floor
slab would be in the order of about 30 kPa to 40 kPa, with isolated column loads at basement level in the
order of about 1500 kN and line loads under the basement walls being around 200 kN/m.
Text Figure 1 overleaf provides a layout plan and cross-sectional views of the proposed development.




Geo-environmental Investigation Proposed Residence
11 March 2025 | 25040-001-Rev0                                                                              1