Dewatering Management Plan

                                                                                      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.
1.1 Proposed development
     The proposed development comprises the construction of a two‐storey residential dwelling over a single‐
     level in‐ground basement on the 622 m2 site. Supplied information indicates that excavations to facilitate
     the basement construction will extend to a maximum of approximately 3.8 m below ground level (bgl) to
     approximately RL‐1.4 m Australian Height Datum (AHD; assuming local existing surface levels of around
     2.4 m AHD and a basement slab in the order of 0.35 to 0.4 m thickness). Localised deeper excavations
     may 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 historically recorded at a depth of approximately 2.1 mbgl (equating to an
     approximate elevation of approximately 0.3 m AHD), during preliminary geotechnical investigations on
     the site (Global 2016). 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 0.5 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”.

     The Act requires that appropriate action be taken to report that environmental harm is occurring or has
     the potential to occur, unless the harm is authorised under an environmental protection policy, an

ADG1786.25 Dewatering Management Plan_Rev0_20.02.25                                                      Page 1