geotech report · MCU15/0087

Slope Stability and Geotechnical Assessment
1 Natasha Avenue, Noosa Heads




        Footing systems more than 8 metres from the top of the escarpment may be designed as a
         stiffened piled raft system.

        All floors within 8 metres of the top of the escarpment should be designed as fully suspended
         floors.

        The tops of all piles must be tied into the raft footing slab to provide lateral restraint to the pile
         head.

It is noted that the operation of a piling rig or heavy machinery near the top of the escarpment carries
a significant risk of instability. In the design of any piles over the escarpment, a piling contractor
should be consulted as to the reach from the rig that can be achieved.

7.8. Impact Assessment
The adoption of the mitigation measures and the construction of the proposed dwelling in accordance
with the recommendations of this report has been assessed in accordance with the method set out in
AGS 2007. The likelihood of failure within a 100 year design life has been assessed to be Unlikely.
The consequences have been assessed to be Minor. A Low to Very Low risk due to landslip is thus
assessed if the recommendations of this report are adopted.

Your client may deem this risk level as acceptable however all opportunities to reduce risk should be
undertaken if reasonable and practicable. On the basis of the Low to Very Low risk of landslide at
this site, the proposed development will not adversely affect the stability of the adjacent lots, provided
the recommendations outlined in this report are adopted. No specific design requirements are
necessary for the access to the site or for service connections to the structures.



8.       Limitations
The assessment presented in this report is based on a limited number of investigation locations and
observations. Engineering judgement has been made to assess potential conditions between
investigation sites, but variability should be expected in the nature and depth of the soil units within
natural geological environments. Should significant variations be noted during construction works on
the site, Coffey should be contacted to reassess the site recommendations.

This report presents a risk assessment of slope stability for the specific proposed development of the
site. This information is intended to be used for design of the nominated structure formulating the
development and is not appropriate for all design conditions that may be constructed. Geotechnical
assessment by a competent and experienced geotechnical practitioner will be required to confirm that
the actual conditions encountered during construction are within the design assumptions.
Consideration should be given to these factors when following recommendations in this report.

We draw your attention to the fact sheet entitled “Important information about your Coffey Report”
attached to this document. Should you wish to discuss any aspect of this report, please contact Ron
McMahon at Coffey’s Kunda Park office.

References
AGS 2007         Australian Geomechanics Society (AGS) “A National Landslide Risk Management
                 Framework for Australia”; Volume 42 March 2007.




Coffey
GEOTKPAR02068AA/A                                                                                            10
12 August 2015