Appendix D - Geotechnical Report

▪   Unit weight and shear strength parameters adopted for the soil and weathered rock were estimated
    based on our interpretation of the geotechnical investigation data and were typically within the mid
    range of values recommended for similar materials in Appendix D of Australian Standard AS4678-
    2002 Earth Retaining Structures.
▪   Analysis was undertaken for specified slip circle entry and exit zones to assess global slope
    instability. The adopted ground surface profile was based on ground slopes measured during the
    fieldwork
▪   The analysis returned an acceptable minimum FOS in excess of 1.5 for both short-term and long-
    term conditions.




                      Text Figure 13: Slope/W Analysis output (critical plane indicated)

The potential impacts on slope stability of the development components have been assessed, and the
measures recommended below in Section 7 have been designed to mitigate those impacts, so that a Low
Risk of instability (and factor of safety of ≥1.5) should be achieved, and can be maintained for the future
subdivision.




Geotechnical Investigation
10 June 2026 | 26073-001-Rev0                                                                           16