Slope Stability Report

7.0 COMMENT & RECOMMENDATIONS

The area of the proposed structure has been defined as Very Low Risk providing the following
recommendations are implemented, managed and maintained for the expected life of the structure
:‐
7.1 House Design
As indicated by the client, the proposed development is to involve the demolition and removal of
the established residential dwelling from the 631.45 square metre allotment. The proposed new
construction is to be positioned largely to the area of the original construction as per the attached
siting plan (refer) appendix D with a nominated off‐set distance of 6.0 metres OMP from the front
Northern boundary, 1.5 metres OMP from the Eastern side boundary, 3.03 metres OMP from the
Southern side boundary, and 8.62 metres from the Western boundary. From the preliminary
information provided, the new construction is to comprise of a double storey, brick veneer structure
supported by slab on ground.

Finished platform levels had not been provided, however upon removal of the existing residence, it
is assumed for the purpose of this report that earthworks are to involve further cut and filling of the
site for the purpose of obtaining desired ground levels and to create a level building platform.

       STA Consulting Engineers are satisfied that a construction type as described above is
        considered suitable for this site providing the following recommendations outlined are
        implemented and maintained for the life of the structure.

7.2 Earthworks

       Retain the existing natural contours wherever possible.
       Where the removal of trees or existing structures is undertaken the voids created by their
        removal, must be over excavated, back filled and compacted with suitable material.
       All earthworks to be carried out in accordance with the requirements of Australian Standard
        AS 3798 Guidelines on Earthworks for Commercial and Residential Developments.

Cuts ‐ Minimise depth.

       Support cut batters with engineered retaining walls or profile to an appropriate slope. For this
        site, exposed cut batters are to be profiled no greater than the following :‐
                         Safe Batter Profile Angles (up to 1.0 metres in height)
                                   Material           Temporary Permanent
                             Non-cohesive Soils         1V : 2H        1V : 2H
       Drainage measures MUST be installed immediately up slope and behind all cut batters
        including those retained to capture both surface and subsurface water movements and divert
        waters to a suitable, controlled outflow below and clear of the building envelope. All drains
        must be maintained for the life of the structure.
       No excavation is to be undertaken within the zone of influence of any existing structure on or
        adjoining the site (including retaining walls, sewer and storm water infrastructure etc..) unless
        it can be shown that measures have been implemented to protect the stability of these
        structures during and after construction. This should be determined by the design engineer.