2 David Low Way - Attachment 4 - Specific Engineering Assessments - Cardno 10-8-17

Our Ref: WE17035
CJ Cardno

Contact: Richard Maurice Shaping the Future
Cardno (Qid) Pty Ltd

10 July 2017 ABN 57 051 074.992

Ken Lynn Pty Ltd Level 11

c/- Peter McGregor 515 St Paul's Terrace
Fortitude Valley QLD 4006
Australia
Locked Bag 4006
Fortitude Valley QLD 4006
Australia

Dear Sir, Phone: 617 3369 9822

Fax: 617 3369 9722
SLOPE STABILITY AT 2 DAVID LOW WAY CASTAWAYS BEACH

www.cardno.com.au

Background

At the request of Dr Trevor Johnson of Cardno | have conducted an investigation into potential slope stability
issues at the above site. It is understood that the property owner wishes to subdivide the site into six lots for
further housing development. The site is currently occupied by two houses and has an approval for a 2 lot
subdivision.

The subject site comprises Lot 71 on Plan MCH2854. Noosa Planning Scheme interactive mapping
indicates that the site is located in a potential landslide hazard area, accordingly a geotechnical assessment
by an RPEQ is required under the Planning Scheme.

Regional Geology

Queensland Government geological maps show that Lot 1 on MCH2854 is underlain by the following
geological formations:

1. Quaternary age freshwater swamp deposits (extreme northern part of the lot, apparently associated
with the creek to the north)

2. Holocene age parabolic dunes; quartz sand (bulk of the lot)

3. Holocene age dunes, mainly parabolic, quartz sand (extreme northern part of the lot)

Slope Stability and Coastal Hazard Mapping

Noosa Planning Scheme interactive mapping indicates that the site is located in a potential landslide hazard
area. The boundary of this mapping appears to coincide with the Queensland Coastal Hazard Areas Map
showing erosion prone areas. There appears to be no other basis for the site to be considered to be located
in a potential landslide area.

It is understood that the subject of coastal erosion is addressed in a separate report.
Site Inspection
On 15% June 2017 | undertook an inspection of the site, the following points were noted.

e The site is currently occupied by two detached single unit houses.
e Where visible, surface soils comprised clean dune or beach sand.

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