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certain benefits. It is a range of risk regarded as non-negligible and needing to be kept under
review and reduced further if practicable”.

The guides suggest that areas of moderate or greater risk should not be developed unless a
rigorous remediation plan be implemented to reduce the area to a level of Acceptable Risk.
AGS defines acceptable risk as “risk which everyone affected is prepared to accept. Action to further
reduce such risk is usually not required unless reasonably practicable measures are available at low
cost in terms of money, time and effort.”.

AGS and regulators generally accept risk levels of “low” or lower as a level of acceptable risk.

Typically where risk levels equate to a level of “low” or lower, this would be comparable to a
global stability factor of safety in excess of 1.5. Where the results of the investigation have
indicated a risk level of “low” or better, it is considered that the factor of safety against global
instability for the area of assessment is greater than 1.5.



3.2 Quantitative Landslide Stability Analysis
AGS prepared a quantitative assessment tool for determining the level of risk for a site. The
tool separates the potential hazards for a site, from a stability context, and rates them with a
level of risk frequency. The multiplication of these individual risk frequency summates as the
risk frequency rating which is then measured against the levels of risk nominated by AGS.


The results of this analysis are shown in Table 2.




29 Apr 2020                                                           Proposed Residnetial Dwelling