Development Application Part 2 of 2 Planning report Geotechnical report and plans MCU11/0168 & OPW11/0257

    GeoConsulting, Report 115988, July 11                                                                                    Page 8
    Lot 34 Marcus Dues Court, Marcus Beach


    5.4      Hazard identification
    The following hazards were identified on this allotment: -
             1.     Hillside slope failure - failure of the natural hillside slopes is most likely to result in shallow
                    slumping of the near surface soils during or following heavy and prolonged rainfall periods or
                    undercutting of the upslope David Low Way road embankment.
             2.     Cut and fill batter failure - failure of any cut and fill batters are considered likely where
                    batters are not supported by retaining walls, during the construction phase and also upon
                    completion.
             3.     Rendered cobble wall - there is the potential for the rendered cobble wall across the property
                    frontage to be overturned by excessive loading by the pool/residential structure.


    Qualitative assessment of the potential hazards and stability risk, including qualitative assessment of
    likelihood, consequence and risk to the proposed development in its present condition, has been
    completed in accordance with the methods suggested in the AGS Guidelines has been summarised in
    Table 5 below.


                                                     Table 5 Risk Assessment Matrix

                  Hazard                            Likelihood                      Consequence                       Risk
     1. Hillside slope failure: -
           Lower than dwelling                        Unlikely                           Minor                        Low
                   At dwelling site              Unlikely to rare                        Minor                        Low
            Above dwelling site                Possible to unlikely                     Medium                        Low
    2. tlnsupported batters. -
                               Cut              Likely to possible               Minor to medium                 Low to moderate
                                  Fill                 Likely                    Minor to medium                 Low to moderate
    3. Rendered cobble wall                           Possible                         Medium                    Low to moderate


    The development should generally include works which result in acceptable risk levels to property after
    completion of construction. In some cases, subject to appropriate monitoring and maintenance
    programs, a tolerable risk may be accepted.



I   The Practice Note Guidelines for Landslide Risk Management (AGS (2007c)) indicate that the regulator
    (i.e. Council) is the appropriate authority to set standards for risk levels but also. suggests that, for most
    development in existing urban areas, criteria based on Tolerable Risk levels are applicable because of
    the trade-off between the risks, the benefit of development and the cost of risk mitigation. Definitions
    of acceptable and tolerable risk as included in the Practice Note Guidelines for Landslide Risk
     Management (AGS (2007c)) are as follows: -


              Tolerable Risk - Risks within a range that society can live with so as to secure certain benefits.
              It is a range of risk regarded as non-negligible and needing to be kept under review and
              reduced further if practicable.




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