08/1787 - Response to Information Request [As Published] · 132008.1787

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coffey > geotechnics -

SPECIALISTS MANAGING THE EARTH

 

3 February 2009

Seahaven Development Pty Ltd
Mezzanine Level, 88 Creek Street
Brisbane 4000.

Attention: Mr Tom Low
Dear Sir,

RE: Seahaven Resort Development, Noosa

Response to SCRC Request for Information.

Coffey Geotechnics Pty Ltd (Coffey) were commissioned on behalf of Seahaven Development Pty Ltd (Seahaven),
to undertake geotechnical and acid sultate soil investigations tor the proposed redevelopment of Seahaven resort
at Hastings Street in Noosa. The factual results and engineering assessments and recommendations of the
investigation are set out in Coffey report GEOTKPARO1484AA/A dated 11 November 2008, This report outlined
surface and subsurface conditions, design considerations and acid sulfate soil considerations.

 

In response to Sunshine Coast Regional Council (SCRC) request for information Item 23, Coffey is able to make

the following comments with respect to geotechnical aspects of wave action and possible water inundation caused
by a major storm event. J

« Storm surge and wave action may cause temporary rises in groundwater levels on the site. The design of
the basement will need to account for this possibility. Our report has already noted the need to allow for
fluctuations in water tevels although not specifically associated with storm surge/wave action. hoa

« Any high level basement footings will be founded in dense sands below mean sea level. Rises in .

groundwater levels due to storm surge and wave action will not impact on the bearing capacity or “4
suitability of these strata to support the structure. Providing there is no erosion under the basement, the *,
founding strata will not be compromised. The basement design is in keeping with current best practice a
and is the standard adapted for other modern buildings in the area. x,

e The capacity of deep piled footings will not be impacted by changes in groundwater levels or upper level
erosion. Providing there is no deep erosion around the piles, the Integrity of the piled foundation will not
be compromised. Oeep piled footings are in keeping with current best practice and are the standard
adopted for other modern buildings in the area.

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Coffey Geotechnics Pty Ltd ABN 93 056 929 483 GEOTKPARD1484AA/B(Rev)
1/36 Kerryl Street Kunda Park QLD 4556 Australia

PO Box 5537 Maroochydore QLD 4558 Australia ms 5
T (+61) (7) 5445 4952 F (+61) (7) 5445 3764 www.coffey.com vo