Attachment 5 - Slope Stability Assessment · RAL20/0005

Mr Peter Loxton                                                                                16162-001-Rev0
                                                                                                  22 July 2016

Design drawings prepared by Void (Ref. VBD 15 10, Sheets 1 to 28, Rev 2, dated 7 July 2016) indicate
that an existing residence located in the western part of the site will be retained, with the proposed addition
to comprise a free-standing building close to the eastern boundary (Ref. Text Figure 2). Construction will
be a combination of masonry and light-weight materials including core-filled blockwork, timber framed walls
with cladding, suspended concrete floors, floors supported by joists, all with a sheet metal roof.

Structural drawings prepared by Barlow Shelley Consulting Engineers (Ref. 1441, ST01 to ST12, Rev A,
dated 15 July 2016) indicate that the addition will be supported by sub-floor walls and posts founded on a
combination of strip and pad footings. Panels for a proposed carport slab on the ground level at the
northern end of the building will sit on up to approximately 0.5 m of imported fill. Apparently due to the
position of the building within a watercourse, and the anticipated presence of loose/wet materials, the
structural design calls for all footings to be supported using 7 tonne capacity screw piles.

The addition will be connected to existing town water and sewerage. An existing sewer main traverses the
western part of the site.




Text Figure 2: Proposed site plan and section (D-D) through addition




1.2    Method and Scope of Investigation
As part of our slope stability assessment, a desk-top study was carried out comprising a review of
published geological and slope stability maps, together with a soil test report by CSI dated 19 July 2016
(Job No. 10549).

A walk-over survey was conducted in order to make an appraisal of the general condition of the site in
regards to topography, drainage, vegetation cover, geology, erosion, condition of existing structures and
slope stability. The walk-over survey was carried out by an experienced geotechnical engineer from
Tectonic on 18 July 2016.

The results of the desk-top study and walk-over survey are included in Section 2 below.

1.3    Qualifications of Responsible Engineer
This report has been prepared by Mr Ashley Davey, an RPEQ with more than 20 years of experience in
geotechnical engineering, including a number of slope stability projects.




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