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

    GeoConsulting, Report #15988, July 11                                                                          Page 12
    Lot 34 Marcus Dues Court, Marcus Beach



    7.       CONCLUSIONS

    7.1      Recommendations
    Notwithstanding the following conclusions, it is recommended:
             ♦    Minimise cut/fill earthworks. Sheet piling or other retention devices should be considered to
                  stabilize the cut embankment during construction.
             ♦    It is proposed to retain the cut embankment with the retaining wall to be incorporated into
                  the residential structure. The retaining wall is to be designed by a suitably qualified engineer
                  and in accordance with the recommendations made herein.
             ♦    Foundations are to be designed based on the bearing capacity given in Tables 1 - 3 in Section
                   3.2.9 of this report.
             ♦     Install and maintain drainage systems to divert water away from the proposed residence


    7.2      Slope Stability Risk
    It has been concluded that this geological region has a negligible to low risk of slope instability.
    Movements are typically in the form of hillside scour and slumping from concentrated runoff and / or
    inappropriate earthworks. With maintenance to the surface drainage, founding to depths as discussed and
    temporary/final retention of cut/fill areas, then the risk will not preclude building. Construction should be
    in accordance with the recommendations made herein, amended and / or reinforced by structural design.


    It has been concluded that this geological region has a low risk of slope instability and with the adoption
    of our recommendations; this risk can be maintained as "low". Construction should be in accordance with
    the recommendations made herein, amended and / or reinforced by structural design.


t   A summary of the identified hazards on Lot 34 is presented in Table 6 with risk assessment prior to and
    subsequent to the recommendations made herein.


                                            Table 6 Final Risk Assessment Matrix



I                       Identified Hazard
                                                                   Existing Risk
                                                                   Assessment
                                                                                                 Risk Assessment
                                                                                                  Subsequent to
                                                                                                 Recommendations
                 1. Hillside slope failure:-
                              Lower than dwelling                       Low                         Very Low
                                    At dwelling site                    Low                         Very Low
                               Above dwelling site                      Low                         Very Low
                 2. Unsupported batters: -
                                                   Cut          Low to moderate                     Very Low
                                                    Fill        Low to moderate                     Very Low
                 3. Rendered cobble wall                        Low to moderate                     Very Low




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