2022-10-24 General Committee Meeting Agenda

GENERAL COMMITTEE MEETING AGENDA                                                   24 OCTOBER 2022




                    Figure 9 – CHAP Coastal Hazards Mapping (Erosion Prone Area)
To address the known risks of instability and erosion the applicant has submitted a Geotechnical
Report and a Coastal Hazards Assessment, which have been reviewed by external consultants
(Geotechnical Engineer and Hydraulic Engineer). The submitted reports were amended after an
initial review by the external consultants and were determined to include methodology and
recommendations which appropriately address the landslide and erosion risks. The measures
proposed have been designed on the basis of a 500 year average recurrence internal storm event
and include:
•    The proposed residence and any ancillary structures (including retaining walls and pools)
     must be supported by footings founded at least 1 metre into natural medium dense to dense
     (or denser) sands.
•    Excavations close to site boundaries may necessitate the installation of temporary shoring
     prior to excavation.
•    Landscaping fill to the rear of the residence shall be limited to 0.5 m high, with surcharges
     elsewhere (e.g. from structures, fill, etc.) not to exceed 10 kPa
•    Ground vibrations during construction to be minimised and monitored.
•    Revegetation of bare slopes around the development area and improvement to the
     vegetation (e.g. with site appropriate natural species) on the natural high dune face
     downslope of the residence.
•     All collected roof water to be directed by pipes to the council stormwater system along
      Seaview Terrace.
Overall Council’s consultants conclude that the Coastal Hazard Assessment and Geotechnical
Investigation have included recommendations that will sufficiently mitigate risks to the dwelling
house from coastal hazards during the lifespan of the structure.
Setbacks
The proposed dwelling house seeks to vary the front, rear and side setbacks as required by
Acceptable Outcomes AO9.1, AO9.2 and AO9.3 of the Low Density Residential Zone Code. The
correlating Performance Outcome states:
PO9
Buildings and structures are designed and sited to:
    a) provide a high level of amenity to users of the subject site and adjoining premises,
        including provision of visual and acoustic privacy and access to sunlight;

                                                                                      Page 16 of 113