Appendix G - Geotechnical Report

Total Concept Homes                                                                                  20332-001-Rev0
                                                                                                   15 December 2020




             Text Figure 10: Footing depth required to minimise the risk of undermining and surcharge loading

Footing bases must be cleaned following mechanical excavation to expose undisturbed materials over the
full base area. Should bored piles be adopted, it is recommended that the piling contractor have a ‘mud
bucket’ or similar device to enable clean out of the pile bases. ‘Spinning’ of the augers is not acceptable
and will not sufficiently remove drill spoil from pile bases. A suitably qualified and experienced engineer
should inspect the footing excavations to confirm appropriate foundation materials and cleanliness prior to
pouring concrete.
If any soil conditions encountered during construction are found to differ from those noted above, Tectonic
must be notified immediately and an inspection carried out to determine if changes to footing design are
required.

4.4       Retaining Structures
Any retaining walls must be founded as described in Section 4.3 above. Engineer design and certification of
retaining walls is required where such walls:
          Exceed 1 m height.
          Are subjected to surcharge loads (e.g. from backslope, adjacent structures, etc.).
          Are located within close proximity to existing structures.

Retaining structures should be engineer designed in accordance with AS4678-2002 Earth-retaining
structures. We suggest the following parameters may be adopted for retaining wall design:




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