07/0604 - Response to Information Request [As Published] · 142007.604

 

Ww
Hewill
EMPLOY! ERS
ass

2005

_ SLOPE STABILITY ASSESSMENT, 20 BAYVIEW ROAD, NOOSA HEADS

Golder Associates Pty Ltd
ABN, 64 006 107 857

Unit 1, Catton Centre, Newspaper Place
Maroochydore, Qld 4558 Australia

(PO Box 5569, Maroochydore BC, Qld 4558 Aushatia)
Telephone +61-7 5443 3511

Fax +61-7 5443 6645

www.goldercom

13 April 2007 . 077682001-1010(AA)

 

Calty Constructions
PO Box 8208
Maroachydore DC Qld 4558

Att: Mr Gordon Clements

Dear Sir

As requested, Golder Associates has undertaken a slope stability assessment for a proposed new swimming
pool and associated landscaping works at the above site. The site currently contains a two storey residence.

This assessment included a review of available data and a walk-over survey of the property by an
experienced Geotechnical Engineer on 9 and 12 February 2007.

A geology map of the area! indicates that the site is underlain by sandstone and siltstone of Mesozoic Age.
This is confirmed by previous subsurface investigation on the site by Golder (ref 03632045(CL)) which
identified very high strength rock at about 1 m to 1.5 m depth, although excavator refusal occurred at less
than 1 m depth. The borehole drilled on the site identified jointed, very high to high strength rock. The
proposed pool is situated on a ridge above a split level boulder retaining wall of about 4 m in height.

The following comments are based upon the results of our walk-over survey and existing subsurface
information.

> Maximum natural ground slopes across the site recorded using a hand-held clinometer are about 15°.
> No signs of global instability were noted on the site.

Based upon the results of this assessment, it is our opinion that there is a Low Risk of slope instability for
the proposed pool which is to be constructed on a well drained-ridge underlain by shallow rock. Relative
levels of slope instability risk and their implications are given in the following table, which are the
definitions given by the Australian Geomechanics Society (March 2000).

{hy 3100) (000 NAMBOUR SPECIAL Geol. Map. DME, 1999
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