Reference Document - Acid Sulfate Soil Report 11_2023- OPW23_0189 · OPW26/0094

                                                                                                                  ADG Consulting Pty Ltd


                      4        Water quality objectives
                      4.1      Receiving environment
                               It is proposed to discharge extracted groundwater directly into the Noosa River canal adjacent to site.

                               Based on the stormwater mapping available via the Noosa Council Enterprise Mapping System
                               (Intramaps) there is a stormwater gully pit located south of 28 Mossman Court. This stormwater pit
                               terminates within the Noosa River (<40 m) directly north of the gully pit. The exact location of the
                               receiving waters/environment will be confirmed on commencement of dewatering; however, it is
                               considered most appropriate that the site will discharge directly north to the adjacent Noosa River canal.

                               The receiving environment in this location identifies as a moderately disturbed, middle estuary
                               environment. 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 enclosed
                               coastal/lower estuaries. 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) The
                                     selected trigger values apply to moderately disturbed systems to provide a 95% level of species
                                     protection for marine waters.
                                    Environmental Protection (Water & Wetland Biodiversity) Policy 2019. Queensland Government.
                                    Noosa River environmental values and water quality objectives. 2022. DES.
                                    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, now the Environmental Protection (Water & Wetland
                               Biodiversity) Policy 2019 (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. The EPP(Water) provides a framework for:
                                    Identifying environmental values for Queensland waters, and deciding the water quality objectives
                                     to protect or enhance those environmental values.
                                    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
                               guideline values are triggers to further action, are inherently conservative, and that the response to non‐
                               compliance should match the magnitude and impacts (if any) of the exceedance.




                          ADG1580.23 Dewatering Management Plan_Rev0_28.09.23                                                       Page 6




Document Set ID: 22828362
Version: 1, Version Date: 26/02/2024