Reference Document - Dewatering Management Plan (For Stamping) MCU25/0053 & OPW25/0074

                                                                                                                ADG Consulting Pty Ltd


                      4        Water quality objectives
                      4.1      Receiving environment
                               It is proposed to discharge extracted groundwater directly over the revetment wall into the adjacent
                               canal network (Noosa River) immediately south of the site (to be confirmed upon commissioning to site).
                               The waterway in this location is mapped as a tidal canal, harbour or marina (DES, 2022). The receiving
                               environment is connected to the Noosa River which ultimately connects to the Pacific Ocean. The
                               following section establishes water quality objectives (WQOs) to ensure that the environmental values
                               of the receiving waters are protected and maintained.
                      4.2      Development of water quality objectives
                               WQOs have been developed to support and protect the designated environmental values (EVs) for the
                               receiving environment. The WQOs are based on a moderately disturbed level of protection for estuarine
                               (marine) waters in tidal canals, constructed estuaries, marinas and boat harbours. The WQOs have been
                               developed with reference to the following guideline documents:

                                    Australian and New Zealand Guidelines for Fresh and Marine Water Quality 2018 (ANZG, 2018).
                                     Australian and New Zealand Governments and Australian state and territory governments, Canberra
                                     ACT, Australia, which supersedes Australian and New Zealand Guidelines for Fresh and Marine
                                     Water Quality, Australian and New Zealand Environment and Conservation Council and Agriculture
                                     and Resource Management Council of Australia and New Zealand (ANZECC/ARMCANZ). 2000.

                                    Environmental Protection (Water & Wetland Biodiversity) Policy 2019. Queensland Government.
                                     2019.

                                    Guidelines for Managing Risks in Recreational Water. Australian Government, National Health and
                                     Medical Research Council (NHMRC). 2008.

                                    Noosa River environmental values and water quality objectives. Department of Environment and
                                     Science (DES). 2022.

                                    Queensland Water Quality Guidelines, Version 3, September 2009. 2013. DEHP.

                               The Australian and New Zealand Guidelines for Fresh and Marine Water Quality by the Australian and
                               New Zealand Environment and Conservation Council and Agriculture and Resource Management Council
                               of Australia and New Zealand (ANZECC/ARMCANZ, 2000), has undergone review, with the publication of
                               the 2018 version. The revised Australian and New Zealand Guidelines for Fresh and Marine Water Quality
                               2018 is a joint initiative between the Australian and New Zealand Governments and Australian state and
                               territory governments (ANZG, 2018) and supersedes the ANZECC/ARMCANZ 2000 publication. Where
                               ANZECC/ARMCANZ (2000) is referenced, the relevant sections are still relevant and consistent with the
                               updated ANZG 2018 publication, as referenced in the ANZG 2018 publication.

                               The Queensland Water Quality Guidelines 2009 (DEHP, 2013) was made pursuant to the provisions of the
                               Environmental Protection (Water) Policy 1999 (the EPP(Water)), which is a subordinate legislation under
                               the Environmental Protection Act 1994 and was developed as the State response to the
                               ANZECC/ARMCANZ (2000) Guidelines. This has been further superseded by EPP (Water and Wetland
                               Biodiversity) 2019 which provides a framework for:
                                   Identifying environmental values for Queensland waters, and deciding the water quality objectives
                                    to protect or enhance those environmental values; and

                                   Including the identified environmental values and water quality objectives under Schedule 1 of the
                                    EPP (Water).
                               WQOs are long term goals for surface water quality management. They are indicators established for
                               receiving waters to support and protect the designated Environmental Values (EVs) for those waters. DES
                               (2022) describes that for slightly to moderately disturbed waters, the guideline values should be
                               compared with the median of values at a test site, whilst ANZG (2018) stresses that the aquatic ecosystem

                          ADG1777.25 Dewatering Management Plan_Rev0_01.05.25                                                     Page 6




Document Set ID: 23735664
Version: 1, Version Date: 12/05/2025