Geotechnical Stability Assessment · MCU19/0008

Project No. PG-2096                                                                                                         Page | 11
April 2019
Ref: PG-2096, 2019-02-21, GR VER 2
Andrew and Michelle Douglas – Geotechnical Stability Assessment - Proposed Residence, 22 Arakoon Crescent, Sunshine Beach




    11.3 Foundations

Foundations for any structure proposed to be constructed on the sloping terrain
must take into account potential lateral loading due to potential soil creep.

    11.4 Drainage

Suitable drainage provisions are essential in the development of the overall site.

Adequate subsoil and surface drainage should be incorporated in retaining walls
and driveways and along the crest of the batters. Any stormwater discharge points
should be suitably protected against scour and erosion.

All roofwater and any other runoff from drains on the site should not be discharged
on the site, but should be taken to tanks and released via piped conduits downslope
and clear of the building envelope and existing fill batters.

Suitable spoon drains should be provided along the top and toe of all batters and
the access driveway. Subsoil drains should also be provided in areas where
seepage may be encountered.

12.0 STABILITY ASSESSMENT

    12.1 Landslip Frequency Analysis

The following landslip frequency analysis of the proposed residence, shed platforms
and immediate surrounds have been made in accordance with Taylor &
MacGregor (2001) Relative Susceptibility recommended method based on the
findings of this stability assessment.

                                                 Landslip Frequency Analysis

           Relative Frequency                        0.32

           Hazard Rating                             Low

13.0 CONCLUSION

Continued long term stability of the site is subject the development taking place in
accordance with the recommendations in this report and relevant Australian
Standards and good hillside engineering and building practices.

Refer to the attached ‘Guidelines for Hillside Construction’ for general practices for
hillside construction.

Pacific    Geotech         Pty      Ltd    provide      a    service   to   review
construction/building/development plans and it is recommended that any
designer/builder utilises this service to ensure that the proposed development is in
accordance with the intentions of this report.