Attachment 2 - Geotechnical Stability Assessment

Project No. PG-2096                                                                                          Page | 11
May 2022
Ref: PG-2096, 2019-02-21, GR VER 4
Clare Design – Geotechnical Stability Assessment - Proposed Residence, 22 Arakoon Crescent, Sunshine Beach




11.0 RESTRICTIONS/PRECAUTIONS

    11.1 General

Good hillside engineering construction practice is considered mandatory during
development of the site for the proposed new residence. The notes and illustrations
attached to this report outline some typical hillside construction guidelines including,
earthworks, erosion control and drainage practices for hillside areas which should be
taken into account as applicable.

Furthermore, in order to ensure long-term stability of the site upon development, the
following restrictions/precautions should also be taken into account.

    11.2 Construction Recommendations

The proposed residence would be suited to a structure either on posts or a slab on
ground with a fully suspended floor, where not supported by a structural retention
system. This type of construction would reduce the amount of earthworks necessary
to prepare a building platform and the extent of retaining systems required across
the site of the proposed house.

Retaining structures should be designed by an experienced Structural Engineer.

    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.