Compiled Reference Document - MCU25/0020 (As Published)

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, and an ASS management plan.



2.           Proposed Development
Architectural drawings supplied to Tectonic (Ref. Chris Clout Design [CCD], Project Name. River Oasis,
Sheet Nos. C0.0 to C5.5 [20 sheets], Issue Preliminary Concept, dated 30 May 2025) indicate that the
proposed new residence will comprise a two-storey building over a two 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 pontoon is also proposed as
part of the works.
The architectural design indicates that excavations for the basement level will generally be about 7 m
deep, however will range up to about 8 m deep for a car lift pit. Excavations for the pool are indicated to
range up to about 1.5 m deep, with negligible filling proposed across the site. It is understood that
engineered shoring is proposed around the full perimeter of the basement.
Preliminary information provided by SCG indicates that serviceability loads (contact pressures) beneath
the basement floor slab would be in the order of about 55 kPa.
Text Figure 1 overleaf provides a layout plan and cross-sectional view of the proposed development.




Geo-environmental Investigation Proposed Residence
4 June 2025 | 25040-001-Rev1                                                                                1