Geotechnical Investigation Report · OPW26/0149

                                                                                                         PTG/04982 – 0001 – Rev0 – Rev0




Figure 5. Excerpt from the Queensland Geotechnical Database geologic map approximately centred on the overall site. Not to scale.


Chapter 5 within The Geology of Queensland 5 describes the Kin Kin Beds as comprising metasiltstone, metashale,
phyllite, fine-grained turbidite with slaty crenulation cleavage. It is considered to be equivalent to the Brooweena
Formation on Maryborough, with the main similarities being redbeds and conglomerates with Early Triassic marine
fossils present, although the Kin Kin beds are more deformed and have a slightly higher metamorphic grade.



5 FIELD INVESTIGATION
The fieldwork included the drilling of three (3) boreholes (designated as BH01 to BH03) on 21 July 2026 in the
approximate locations shown on our Test Location Plan presented in Appendix 1.
The boreholes were drilled using a ute-mounted drilling rig with a tungsten carbide tipped solid flight auger. The arising
in each borehole was classified and logged in accordance with AS1726:2017 by an experienced geotechnical driller
from PTG Consulting.
The soil consistency and relative density described on the borehole logs were inferred from the DCP results, tactile
assessment and published correlations.
The logs of the borehole reports are presented in Appendix 1.



6 GEOTECHNICAL MODEL

      6.1 Encountered Strata
The subsurface ground conditions encountered are briefly described below, with depth information summarised in
Table 1. For a full detailed description of the subsurface conditions encountered, reference should be made to the
borehole log reports presented in Appendix 1.
Natural soil, consisting of silty CLAY was identified from ground surface in all boreholes. The soil was generally logged
as being of medium plasticity to high plasticity, with DCP results indicating the soil was generally very stiff to hard,
with strength generally increasing with depth.




5 Jell, P. A. (Ed.). (2013). Geology of Queensland. Geological Survey of Queensland.

https://geoscience.data.qld.gov.au/dataset/cr145752

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