ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24

                                                                                              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 2.7 m below natural
         ground levels (approx. 2.2 m AHD) to a maximum excavation elevation of approximately ‐0.5 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.
              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.
1.4      DMP objectives
         The objectives of the DMP are to:




    ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24                                                         Page 1