Slope Stability Assessment

Paul & Janelle DeSouza                                                                            22198-001-Rev1
C/- Sarah Waller Architecture                                                                        25 July 2022

Architectural layout and design drawings were provided with the project brief (Ref. Sarah Waller
Architecture [SWA] Project No. 2103, Dwg. No. 000 to 701, Rev E, dated April 2022). The drawings
indicate that the residence would be sited towards the northern side of the allotment, just off the northern
crest of a well defined topographical knob.

The structure would be built over an extensive one storey footprint, with a mixture of indoor space and
semi-outdoor pavilions. The building would be of low set construction, indicated on the drawings to mostly
feature clad walls, with occasional feature stonework and glass.
To facilitate the construction, it is generally expected that cutting would be undertaken around 1 m to 2 m
from the current topographical crest. Filling is indicated on the drawings to range to 2 m to 3 m height to the
north-eastern and north-western corners of the house.

A swimming pool would be located downslope to the north, with landscaped gardens between requiring
filling of about 3 m height to achieve the level with the house floor level. The pool shell would be at the
finished level of the fill on the upslope side, and up to 2 m out of ground downslope.

A shed is also indicated on the drawings about 25 m to 30 m west of the main residence. Construction
details were not provided, however based on topographical information at that location, it is estimated that
cut/fill earthworks in the order of about 1 m depth/height would be required to form an level building
platform between.
Access to the proposed residence would following an existing track alignment extending from the site
frontage to Davis Road along the crestline of a spur ridge extend from the north-western corner of the
allotment and exploit an existing roughly formed track to the western boundary. The driveway leads
thereafter to the front (east) of the residence and across the slope to the north. It is assumed the access
driveway would be surfaced with concrete.

The site does not have access to a potable mains water supply or sewerage infrastructure, and therefore
rainwater collection tanks will require to provide drinking water with effluent disposal also to be
accommodated on site as part of the future design process. Water tanks are shown to the west of the
house, but it is not known if these would be above or below ground.

A layout and perspective view of the proposed residential construction works is presented below in Text
Figure 2.




Text Figure 2: Site layout and rendered architectural view of proposed residence (courtesy SWA)




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