Meyer Judgment Sealed

 

eni

geotechnical & environmental engineers

PROPOSED RESIDENTIAL DEVELOPMENT
39 PICTURE POINT CRESCENT, NOOSA HEADS

 

Table 3: Details of Qualitative Risk Assessment for Property (AGS 2007)

 

 

 

 

 

Assessed
Hazard Likelihood | Consequence Risk Comments
Given the slightly gentler gradients through the
proposed building area and retention system proposed
1: Building Envelope - Failure it is considered Unlikely that a landslip would develop
through very loose to loose or ii ; in these materials, subject to implementation of the
medium dense natural sands Unlikely Medium Low recommendations in Section 6 (especially footing
above the foundation depth. depth and type). Given a potential Medium impact
from such instability the resultant risk would be Low
as per AGS 2007.
The likelihood of a deep failure through the dense (or
: di denser) natural sands below the proposed foundation
ac Building Envelope:“Déep depth is assessed as Rare due to the lack of precedence
failure through the dense (or Z ec
denser) sands below the Rare Major Low of such movements locally, no signs of any existing slope
foundation depth. instability and a lack of groundwater. Although the
consequence of such a failure would be Major, the
resultant risk is Low as per AGS 2007.
The likelihood of a slip/failure through the temporary
retention system (sheet pile wall, or similar) as outlined in
3: Instability through temporary Section 6.4, is assessed as Rare, subject to detailed
sheet pile retention system, or Rart Maj Le design by a suitable qualified RPEQ engineer and
similar, as discussed in Section oe S)OF Ow construction by a specialist contractor which accounts for
6.4. the required factors of safety against slope instability.
Although the consequence of such a failure would be
Major, the resultant risk is Low as per AGS 2007.
As discussed further below, it is Likely that near surface
translational failures may occur over the face of the
natural dune slope within the site, and in the slope that
2 sai continues down to Noosa Drive to the north, over the
Simin oie tees fod Building design life of the project. However, given the extent of the
Likely Insignificant Low recommendations below, it is considered that this will

movements in very loose to loose!
natural sands near surface.

 

 

 

 

affect future landscaping/garden areas only, and when
considered against the value of the property and that the
likelihood for adverse effects to the building is limited, an
Insignificant consequence is assessed. Thus the
resultant risk is Low as per AGS 2007.

 

Our assessment indicates that a Low Risk of slope instability could be achieved for proposed residential
development at 39 Picture Point Crescent, and that there would be a Low Risk of slope instability, subject to
implementation of the recommendations outlined in Section 6 (especially around permanent retention of
cuts, adoption of relatively deep piles, and protection from erosion from the dune face).

 

10 February 2023
Report No. 22511-001-RevO

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