RFI - ADG1451.22 Dewatering Management Plan_Rev0_28.02.23

                                                                                          ADG Consulting Pty Ltd


1    Introduction
     ADG Consulting Pty Ltd (ADG) was engaged by Craig & Nathan Francis care of SCG Consulting Engineers
     (SCG) to prepare a Dewatering Management Plan (DMP) for the proposed residential development within
     property described as Lots 2 & 3 on MCH3881, situated at 130‐132 Gympie Terrace, Noosaville,
     Queensland.
1.1 Proposed development
     The proposed development comprises the construction of four two‐storey residential dwellings (2x
     duplex pairs) overlying two single level in‐ground basements on the 1,581 m2 site. Supplied information
     indicates that excavations to facilitate the basement construction will extend to a maximum of
     approximately 2.3 m below ground level (bgl) to approximately ‐0.7 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 depths pf between 1.0 to 1.1 mbgl (equating to an approximate
     elevation of 0.6 m AHD), during preliminary geotechnical works (drilling) on the site by Pacific Geotech in
     October 2022. Given the sites proximity to the 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.




ADG1451.22 Dewatering Management Plan_Rev0_28.02.23                                                           Page 1