Slope Stability Report

Dean & Vanessa McDonald                                                                       21505-001-Rev0
                                                                                              4 February 2022

At the time of the assessment an existing relatively level building platform (approximately 75 m long x 10 m
to 25 m wide) had been previously formed by cut and fill earthworks. It was estimated that fill in this area
ranged up to 2.5 m high, with cuts up to 4.5 m depth. It is anticipated that minimal additional earthworks will
be required (i.e. less than 0.5 m depth/height) for the proposed shed building pad. The client has indicated
the proposed shed is to be located at the north-western end of the building platform with footings to be
wholly found within the cut area, approximately 10 m off the crest of the existing fill batter.

Information supplied by the client indicates the shed will have a plan area of 22.3 m by 11 m and will
comprise a steel portal frame with light weight corrugated steel cladding on a concrete floor slab. The client
has indicated they would like to plant out the upslope cut batter. Text Figure 2 below illustrates the proposed
shed design.




Text Figure 2: Proposed shed design (provided by client)


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, council overlays and aerial photographs.

A walk-over survey including dynamic cone penetrometer (DCP) testing was conducted to make an
appraisal of the general condition of the site regarding topography, drainage, vegetation cover, geology,
erosion and condition of existing structures. The walkover was undertaken by an experienced geotechnical
engineer from Tectonic on 17 January 2022.

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 26 years’ experience in
geotechnical engineering, including numerous slope stability projects.




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[OCR of page images]
Dean & Vanessa McDonald 21505-001-RevO
4 February 2022

 

At the time of the assessment an existing relatively level building platform (approximately 75 m long x 10 m
to 25 m wide) had been previously formed by cut and fill earthworks. It was estimated that fill in this area
ranged up to 2.5 m high, with cuts up to 4.5 m depth. It is anticipated that minimal additional earthworks will
be required (i.e. less than 0.5 m depth/height) for the proposed shed building pad. The client has indicated
the proposed shed is to be located at the north-western end of the building platform with footings to be
wholly found within the cut area, approximately 10 m off the crest of the existing fill batter.

Information supplied by the client indicates the shed will have a plan area of 22.3 m by 11 m and will
comprise a steel portal frame with light weight corrugated steel cladding on a concrete floor slab. The client
has indicated they would like to plant out the upslope cut batter. Text Figure 2 below illustrates the proposed
shed design.

 

Text Figure 2: Proposed shed design (provided by client)

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, council overlays and aerial photographs.

A walk-over survey including dynamic cone penetrometer (DCP) testing was conducted to make an
appraisal of the general condition of the site regarding topography, drainage, vegetation cover, geology,
erosion and condition of existing structures. The walkover was undertaken by an experienced geotechnical
engineer from Tectonic on 17 January 2022.

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 26 years’ experience in
geotechnical engineering, including numerous slope stability projects.

 

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geotechnical & environmental engineers.

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