ADG1290.21 Dewatering Management Plan_Rev1_02.02.22 · OPW21/0315

                                                                                      ADG Consulting Pty Ltd


1    Introduction
     ADG Consulting Pty Ltd (ADG) was engaged by Chris Clout Design (CCD) on behalf of Michelle and Franco
     DePasquale to prepare a Dewatering Management Plan (DMP) for the proposed residential development
     within property described as Lot 16 on N10576, situated at 33 Wyuna Drive, Noosaville, Queensland.

     The original DMP (Rev 0, October 2021) has been revised (this Report, Rev 1.0) in response to an
     Information Request issued by Noosa Council on 22 November 2021 (reference OPW21/0315).
1.1 Proposed development
     The proposed development comprises the construction of a two‐storey apartment building over a single‐
     level in‐ground basement carpark. Supplied information indicates that excavations to facilitate the
     basement construction will extend to a maximum of approximately 3.1 m below existing ground level
     (mbgl) to approximately ‐0.8 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 between 1.65 to 2.35 mbgl (equating to approximate elevations
     of 0.25 to 0.05 mAHD), during preliminary and follow‐up geotechnical works (drilling) on the site by
     Douglas Partners in September 2020 and December 2021. Douglas Partners also undertook a follow‐up
     standing water level gauging of 1.7 mbgl (equating to groundwater elevation of 0.2 mAHD) on 18 January
     2021. Given the sites proximity to the Noosa River 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. 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




ADG1290.21 Dewatering Management Plan_Rev1_02.02.22                                                     Page 1