ADG1673.24 Dewatering Management Plan_Rev0_12.07.24

                                                                                          ADG Consulting Pty Ltd


1    Introduction
     ADG Consulting Pty Ltd (ADG) was engaged by Sam Tatton care of SCG Consulting Engineers (SCG) to
     prepare a Dewatering Management Plan (DMP) for the proposed residential development within
     property described as Lot 12 on N10576, situated at 25 Wyuna Drive, Noosaville, 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 641 m2 site. Supplied information indicates that excavations to facilitate
     the basement construction will extend to a maximum of approximately 3.0 m below ground level (bgl) to
     approximately ‐0.5 m Australian Height Datum (AHD; assuming local existing surface levels of around 2.5
     to 2.7 m AHD). Localised deeper excavations may be required for the construction of other structural
     elements (i.e. footings and pile caps), where required.

     Groundwater seepage was recorded at a depth of approximately 2.4 mbgl (equating to an approximate
     elevation of approximately 0.3 m AHD), during preliminary geotechnical investigations on the site by
     PTG Consulting in June 2024. Given the sites proximity to the Noosa Inlet/Noosa River and the presence
     of groundwater within the excavation extent, dewatering will 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
     environmental management program, a development approval, or an environmental protection order.
     This is known as the “Duty to Notify”. Failure to fulfil this duty is an offence and may result in prosecution.




ADG1673.24 Dewatering Management Plan_Rev0_12.07.24                                                           Page 1