Compiled Reference Document - MCU25/0020 (As Published)

ADG Consulting Pty Ltd

 

1 ‘Introduction

ADG Consulting Pty Ltd (ADG) was engaged by Sunshine Beach Noosa Developments Pty Ltd (on behalf
of Des Wood) to prepare a Dewatering Management Plan (DMP) for the proposed residential
development within property described as Lot 2 on SP281580, situated at 11 Ravenwood Dr, Noosa
Heads, Queensland. A previous version of this DMP (RevO dated 20/02/25) was prepared on the basis of
a single level basement, which has now been amended to two level, and the DMP has now been revised
in response to this change and also in response to a ‘Further Advice — Development Application’ letter
received by the project from Noosa Council (reference MCU25/0020, dated 24/09/25).

1.1 Proposed development

The proposed development comprises the construction of a two-storey residential dwelling over a two-
level in-ground basement on the 622 m’ site. Supplied information indicates that excavations to facilitate
the basement construction will extend to a maximum of approximately 7.4 m below ground level (bgl) to
approximately RL-5.0 m Australian Height Datum (AHD; assuming local existing surface levels of around
2.4m AHD and a basement slab in the order of 0.4 m thickness). Localised deeper excavations will also
be required for the construction of the car stacker overrun pit and other structural elements (i.e. footings
and pile caps), where required.

Groundwater seepage was previously recorded at a depth of between approximately 1.8 to 2.0 mbgl
(equating to an approximate elevation of approximately 0.6 to 0.4 mAHD), during geotechnical
investigations on the site (Tectonic, 2025). No further recent data has been supplied for review in
preparing this DMP, however based on ADG’s experience on nearby sites in the locality in recent years,
it is anticipated that groundwater should be expected at or around 0.6 m AHD +/- 0.5 m, depending on
tidal and seasonal rainfall conditions. Dewatering will therefore be necessary to allow the basement to
be constructed in dry conditions.

1.2 Relevant guidelines

The DMP was prepared with reference to the following documents:

— Australian and New Zealand Guidelines for Fresh and Marine Water Quality. 2018. Australian and
New Zealand Governments and Australian state and territory governments (ANZG), Canberra ACT,
Australia.

— Australian and New Zealand Guidelines for Fresh and Marine Water Quality. 2000. Australian and
New Zealand Environment and Conservation Council and Agriculture and Resource Management
Council of Australia and New Zealand (ANZECC/ARMCANZ).

— Environmental Protection (Water & Wetland Biodiversity) Policy 2019. Department of Environment
and Science (DES), Queensland Government.

— Noosa River environmental values and water quality objectives. 2022. Department of Environment
and Science (DES), Queensland Government.

— Guidelines for Managing Risks in Recreational Water. 2018. Australian Government, National Health
and Medical Research Council (NHMRC).

= Monitoring and Sampling Manual 2018, Version 2 June 2018. 2018. Department of Environment and
Science (DES).

- Queensland Water Quality Guidelines 2009, Version 3. 2013. The Department of Environment and
Heritage Protection (DEHP).

1.3 General environmental duty

The Environmental Protection Act 1994 describes that all persons in Queensland have a “General
Environmental Duty” and that “a person must not carry out an activity that causes, or is likely to cause
environmental harm unless the person takes all reasonable and practicable measures to prevent or
minimise the harm”.

 

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