Reference Document - Geotechnical Investigation Report MCU25/0053 & OPW25/0074

                                                                                                                PTG/01608 – 0001 – Rev0


            A brief review of historical imagery indicates the site was built up in 1972 to 1973 on natural islands. Figures 4 and 5
            show the vicinity before and after construction of the islands.




            Figure 4: Noosa, May 1972 (from QImagery).                    Figure 4: Noosa, September 1973 (from QImagery).



            4 PROJECT CONSTRUCTION OVERVIEW
            Based on the provided plans, it is understood that the development will comprise demolition of the existing dwelling,
            then construction of a new dwelling consisting of a single basement level below ground with an area of 471 m2 and
            two residential levels above ground including a swimming pool. It is assumed the works will comprise of minor
            earthworks, basement excavation and construction of suitable foundations to a depth of up to 3.5 m below ground
            level.



            5 FIELD INVESTIGATION
            The fieldwork scope included four boreholes drilled to 4.5 m Below Ground Level (mBGL) in depth using a 4WD utility
            mounted drilling rig fitted with 100 millimetre (mm) diameter solid flight augers. The drilling was undertaken by an
            experienced driller who logged the bores and collected samples.

            Disturbed samples of representative soil types were collected from the boreholes for soil description and classification
            purposes and subsequent laboratory testing. The visual-tactile description and classification methods undertaken on
            disturbed samples, and shown on the attached logs, are described in accordance with AS1726:2017.

            DCP testing was undertaken adjacent to the boreholes from the surface and then recommenced at selected depths
            within the/select boreholes with the number of blows to achieve 100 mm depth penetration recorded in accordance
            with AS1289.6.3.2.

            Soil consistency and relative density described on the borehole logs were inferred from the DCP results, tactile
            assessment and published correlations.

            The approximate borehole locations and numbers are shown on the test location plan attached in Drawing 1. The
            borehole log report sheets are attached in Appendix 2.



            6 GEOTECHNICAL MODEL
            Table 1 summarises the soils encountered within the boreholes. In summary the soil profile encountered within the
            boreholes comprised a silty sand/sand to the termination depth of 4.5 m.

            The sand has been logged as ‘fill’ as no discernible natural boundary was observed during drilling. However, as noted
            above, the material has been placed for over 50 years and can be treated as natural sand for engineering purposes.




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Document Set ID: 24149758
Version: 1, Version Date: 26/09/2025