Appendix G - Geotechnical Report

Total Concept Homes                                                                                       20332-001-Rev0
                                                                                                        15 December 2020

We have been supplied with a proposed layout plan for the subdivision by Alta Projects (Ref. Alta, Job No.
A6578/20, Dwg. No. A6578/20/P01 to P04), which indicates that it is proposed to retain an existing residence
on a larger portion of the existing allotment extending to the east and south-east. The north-western portion
of the allotment would be divided from the existing allotment, where a new residence would be located.

Drawings show that an existing access for the house would be upgraded, initially being shared between the
two future allotments off Black Mountain Range Road to the west; before splitting along the proposed
southern boundary of the new lot, extending to the position of the future residence.

Sections provided as part of the drawing package show that much of the driveway alignment would be at
grade with the existing track, with filling of up to 1.5 m height required towards the central area of the
alignment. The fill would be retained, and it is understood that the primary design option being considered is
gabion baskets. Some minor cutting is expected on the upslope side of the driveway to the eastern side of
the alignment.

The property does not have access to mains sewerage or a piped, potable water supply, and therefore
collection of rainwater in tanks and on-site disposal of effluent will be required.

An extract of the design drawings is given below in Text Figure 2.

                                                             Indicative area for proposed future residence




                                                    Proposed subdivision boundary




                                                                                                             Driveway alignment
                                                                  Existing Lot boundary




Text Figure 2: Extract of overall subdivision layout (LHS); and driveway alignment to future residence (courtesy Alta)


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 maps, aerial photos, and a site classification report prepared by Ground Drill also
prepared a report to address on-site effluent disposal design and feasibility. Both reports are attached (Ref.
Job No. 20/373, dated 3 December 2020).

A walk-over survey was conducted in order to make an appraisal of the general condition of the site in
regard to topography, drainage, vegetation cover, geology, erosion and slope stability and existing
structures. The walk-over survey was carried out by an experienced engineering geologist from Tectonic
on 26 November 2020 concurrent with the drilling by Ground Drill.

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 reviewed by Mr Ashley Davey, an RPEQ with more than 25 years’ experience in
geotechnical engineering, including a number of slope stability projects.




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