Dewatering Management Plan · OPW24/0032

                                                                                          ADG Consulting Pty Ltd


1    Introduction
     ADG Consulting Pty Ltd (ADG) was engaged by Metricon Homes QLD Pty Ltd to prepare a Dewatering
     Management Plan (DMP) for the proposed residential development within property described as Lot 145
     on N21859, situated at 38 Mossman Court, Noosa Heads, Queensland.
1.1 Proposed development
     The proposed development comprises the construction of a two‐storey residential dwelling over a single
     storey in‐ground basement carpark. The supplied information indicates that excavations to facilitate the
     construction of the basement level will extend to a maximum of approximately 2.45 m below natural
     ground levels to a maximum excavation elevation of approximately ‐0.05 m Australian Height Datum
     (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 1.6 m below ground level, during preliminary geotechnical works
     (drilling) on the site by Douglas Partners (2021). Given the sites proximity to the Noosa River (adjacent)
     and the presence of groundwater, 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.
          Environmental Protection (Water) Policy 2009, Noosa River environmental values and water quality
           objectives. 2010. Department of Environment and Resource Management (DERM), 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.
1.4 DMP objectives
     The objectives of the DMP are to:


ADG1304.21 Dewatering Management Plan_Rev0_08.10.21                                                           Page 1