Appendix D - Geotechnical Report

                Indicative site location




                                                            (Kin Kin Beds)


                              Text Figure 11: Extract of Gympie Surface Geology Map

As mentioned above in Section 5.1, significant exposures of the underlying soils and rock were not
observed during our walk-over. However, in livestock tracks across some of the slopes and near the gully
inverts, grey, brown and pale orange brown, silty clays with varying gravel content were noted. These
types of soils are consistent with the weathering of the Kin Kin Beds.


5.3          Subsurface Conditions
The test pits were positioned generally around the upper and lower parts of the anticipated building
envelopes (Ref. Text Figure 1) and all produced similar results.
The subsurface conditions encountered in the test pits are summarised as follows:
▪   Topsoil – comprising silty clay with rootlets to between 0.1 m and 0.2 m BGL; then
▪   Residual Soils & XW Material – mostly very stiff (occasionally grading to hard at the transition to
    the underlying ‘rockhead’), high plasticity, silty clays with varying angular, fine to coarse sized gravel
    content. The residual soils and XW materials extended to depths of between 0.8 m and 1.3 m BGL;
    underlain by
▪   Weathered Rock – described mostly as highly and distinctly weathered, very low to low strength,
    phyllite. The rock material was highly fractured, and therefore could be excavated under slow
    digging conditions with a 5.5 tonne excavator with 600 mm toothed bucket. This was progressed to
    depths of up to 3.1 m BGL, with ‘refusal’ only logged in test pit TP2 (upslope side of proposed Lot 1).
    In test pit TP2 the test pit was terminated on a quartz vein, with some broken quartz also reported in
    test pit TP3A. Based on our experience in the regional geology, the occurrence of quartz veins are
    not uncommon within the Kin Kin Beds, especially in the vicinity of potential fault activity.
Detailed descriptions of the subsurface conditions encountered in the test pits are provided in the
reports attached in Appendix A, along with definition sheets which describe terms and abbreviations
used on the reports.




Geotechnical Investigation
10 June 2026 | 26073-001-Rev0                                                                                11