RFI -Attachment 6 - Geotechnical Investigation Report CORE.pdf

Walsh Consulting Engineers




                                                                           Site location




Image 5: Extract from Noosa Shire Council landslide hazard overlay mapping.

7.2    Stability Risk Assessment
A qualitative slope stability risk assessment for this project has been carried out following the Australian
Geomechanics Society (AGS) Guidelines for Landslide Risk Management (March 2007), refer Table 5
below. The risk assessment relates to property. Relative levels of risk and their implications are given in
Table 6 below and the qualitative terminology (i.e. likelihood and consequence definitions) for use in
assessing risk to property are attached in Appendix B.
Table 5: Stability risk levels.
          Risk Level                                                Example Implications(1)

                VERY HIGH         Unacceptable without treatment. Extensive detailed investigation and research, planning
 VH                               and implementation of treatment options essential to reduce risk to Low; may be too
                RISK
                                  expensive and not practical. Work likely to cost more than value of property.
                                  Unacceptable without treatment. Detailed investigation, planning and implementation of
 H              HIGH RISK         treatment options required to reduce risk to Low. Work would cost a substantial sum in
                                  relation to the value of the property.
                MODERATE          May be tolerated in certain circumstances (subject to regulators’ approval) but requires
 M                                investigation, planning and implementation of treatment options to reduce risk to Low.
                RISK
                                  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.
                VERY LOW
 VL                               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.




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