slope stability

Integra Partnerships                                                                           22340-001-Rev0
                                                                                            14 September 2022

carried out from the ground surface and extending below the borehole termination depth to between 4.0 m
and 4.7 m BGL.

The borehole logs and explanatory notes are attached to this report. The results of the desk-top study, walk-
over survey and borehole drilling are included in Section 2 below.

1.3        Qualifications of Responsible Engineer
This report has been reviewed by Mr Ashley Davey, an RPEQ with over 27 years of experience in
geotechnical engineering, including a number of slope stability projects on the Sunshine Coast.



2.0         DESCRIPTION OF EXISTING CONDITIONS
2.1        Geology and Subsurface Conditions
Available geological information 1 indicates that the site is underlain by Pleistocene age parabolic dunes
(“Qpd/2”) comprising “quartz sand” (Ref. Text Figure 4).




                                                                Approx. site location




Text Figure 4: Extract from Laguna Bay Geology Map

The boreholes encountered relatively consistent subsurface conditions, summarised as follows:

           Fill – Borehole BH1 only, comprising very loose to loose silty sand to 0.4 m depth, then
           Natural Sands – initially comprising very loose to loose silty sand/sand to depths between 1.8 m
            and 2.5 m BGL, then becoming medium dense to the borehole termination depths (2.8 m to 3 m
            BGL).

Results of the DCP testing completed below the borehole termination depths indicated inferred dense
sands at depths of 2.9 m to 3.8 m BGL extending to the DCP termination depths of 4.0 m to 4.7 m BGL.

Groundwater was not encountered during drilling of the boreholes, with the soils being moist.




1
    1:100,000 Laguna Bay Surface Geology, Sheet 9545, Compilation Map, DNRME, 2018




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