Preliminary Geotechnical Investigation · OPW21/0315

                                                                                             Page 2 of 11




This report must be read in conjunction with the attached notes entitled “About This Report” along with
any other attached explanatory notes and should be kept in its entirety without separation of individual
pages or sections.


2.     Site Description

The site is broadly a rectangular block located at 33 Wyuna Drive, Noosaville. The site is bounded by
Wyuna Drive to the south, existing residential dwellings to the east and west and a canal to the north
(refer to Drawing 1 attached).

At the time of the investigation, the site was occupied by an existing residential dwelling. Access for
the investigation was limited to the grassed front yard.


3.     Regional Geology and Acid Sulfate Soil Conditions

Reference to the Geological Survey of Queensland’s 1:100,000 scale digital geological maps indicate
the site is located in an area underlain by Pleistocene aged estuarine channels and banks typically
comprising “sandy mud, muddy sand, minor gravel”.

The natural subsurface conditions encountered in the bores comprised silty sand and sand, which is
consistent with above described geology.

Reference to the Department of Natural Resources and Mines 1:100,000 Acid Sulfate Soils Redcliffe
to Teewah Map indicates the site is located in an area described as disturbed land likely to contain
ASS.

The presence or otherwise of ASS was determined through laboratory testing. The results of
laboratory testing are discussed further in Sections 6.0 and 7.5.2 of this report.


4.     Field Work Methods

The field work was undertaken on 24 September 2020, and comprised the drilling and sampling of one
bore (designated as Bore 1). Due to the existing dwelling, access for the drilling rig was restricted to
the grassed front yard. The approximate bore location is indicated on Drawing 1 attached.

The bore was drilled to 6.0 m depth using a 4WD mounted Jacro 200 drilling rig utilising continuous
flight augers fitted with a tungsten carbide (TC) bit. Dynamic cone penetrometer (DCP) testing was
carried out to assess the relative density of the subsurface soil conditions.

On completion, the bore was observed for groundwater seepage and then backfilled with spoil which
was tamped into the hole.




Proposed Residence                                                                    95120.00.R.001.docx
33 Wyuna Drive, Noosaville                                                                   October 2020