Slope Stability Assessment

                                                                                               Lot boundary




     Approx. proposed building locations




                         Text Figure 8: Extract from NC Landslide Hazard Overlay Mapping

It should be noted that the NC map is a broad-scale indication of the potential landslide susceptibility
and is superseded by site specific investigation and this assessment. Near the proposed residential
buildings there were no signs of global, natural slope instability.

3.2         Stability Assessment
The risk assessment for this project has been carried out following AGS 2007 Practice Note Guidelines for
Landslide Risk Management. Relative levels of risk and their implications are given in Table 1 below, and
the Qualitative Terminology for Use in Assessing Risk to Property which is also attached.

Table 1: Stability Risk Levels
 Risk Level                Example Implications(1)

 VH       Very High        Unacceptable without treatment. Extensive detailed investigation and research, planning and
          Risk             implementation of treatment options essential to reduce risk to Low; may be too expensive and
                           not practical. Work likely to cost more than value of property.

 H        High Risk        Unacceptable without treatment. Detailed investigation, planning and implementation of
                           treatment options required to reduce risk to Low. Work would cost a substantial sum in relation to
                           the value of the property.

 M        Moderate         May be tolerated in certain circumstances (subject to regulators’ approval) but requires
          Risk             investigation, planning and implementation of treatment options to reduce risk to Low. Treatment
                           options to reduce to Low risk should be implemented as soon as practicable.

 L        Low Risk         Usually acceptable to regulators. Where treatment has been required to reduce the risk to this
                           level, ongoing maintenance required.

 VL       Very Low         Acceptable. Manage by normal slope maintenance procedures.
          Risk

Note: (1) The implications for a particular situation are to be determined by all parties to the risk assessment and may depend
on the nature of the property at risk; these are only given as a general guide.




13 February 2026
26020-001-Rev0                                                                                                              8 of 13