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

GeoConsulting, Report #15988. July 1 1                                                                            Page 9
Lot 34 Marcus Dues Court. Marcus Beach


Areas initially of moderate or high risk level to property may be accepted for development subject to
detailed investigation to define hazards, provided that planning and treatment options are implemented
to reduce risks to acceptable levels.


         Acceptable Risk - Risks 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.
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Low to moderate risk levels are usually considered acceptable to regulators provided that the
development of the site be carried out in accordance with good engineering practice for hillside
developments and with the subsequent Section 6 of this report.                                                               r

6.0      CONSTRUCTION RECOMMENDATIONS

6.1      Good Engineering Practice
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Attached as APPENDIX B, are extracts from Practice Notes £t Guidelines for Landslide Risk
Management, (AGC (2007c)), including: -
         ♦      "Some Guidelines for Hillside Construction"
         ♦      "Examples of Good Hillside Practice"
Recommendations and guidelines have been related to this allotment below.


6.2      Site Clearing
Only clear the site where required for construction of the proposed residence, and retain as much of the
natural vegetation as possible. Original dunal vegetation has been removed. It is envisaged the site will
be stripped within the construction envelope. Species should conform to the Foundation Maintenance
and Footing Performance: A Homeowner's Guide, (CS1RO 2003), a copy of which is attached as
APPENDIX C.


6.3      Earthworks
        6.3.1       General Earthworks
Some moderate earthworks (approximately 2900mm cut) will be required in order to create a level
basement platform, (RL99.5 as specified on the architectural plans).                       The following details should be
considered:
          ♦
          ♦
                Earthworks should be prepared in accordance with the guidelines of AS 3798.
                A positive drainage gradient is to be maintained over the building areas.
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          ♦     Spoon drains to be installed at the toe of cut embankments
          ♦     Fill batters should grade at not less than 1:3 (V:H).
          ♦     Cut batters that are not retained should grade at not less than 1:5 (V:H).
          ♦     Exposed surfaces should be vegetated to reduce the opportunity for runoff scour


The proposed building area is to be stripped of all organic material.
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