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

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                              Regardless of the WQOs adopted in this DMP, the General Environmental Duty set out in the EP Act is
                              paramount, which requires 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”.
                      4.3     Proposed water quality objectives
                              The proposed water quality objectives that have been developed for the discharge of extracted
                              groundwater from the site are provided in the Tables below. All water discharged from the site must
                              comply with the discharge criteria provided in Table 2. In addition, the receiving water quality within a
                              20 m radius of the discharge point entry to the receiving water shall comply with the receiving water
                              criteria provided in Table 3. Receiving waters data will be assessed against background monitoring data
                              if non‐compliant results are obtained at the receiving waters monitoring location.

                              Table 2 Discharge criteria

                                                      Parameter                                                         Criteria

                               Physico‐chemical
                               pH (pH units)                                                                           6.5 – 8.51
                               Dissolved oxygen (% saturation)                                                            ≥802
                               Suspended solids (mg/L)                                                                   ≤501,2
                               Turbidity (NTU)                                                                            ≤502
                               Litter                                                                                None visible
                               Total metals (µg/L)
                               Aluminium                                                                         No ANZG criteria / 2003

                               Iron                                                                              No ANZG criteria / 3003

                              Table notes:
                              1. QWQG 2009 (2013) Refer to Table 8.2.1. Summary of design objectives for management of stormwater quality and flow –
                                 construction phase of development in Queensland.
                              2. Typical discharge criteria recognised throughout Queensland & NSW.
                              3. Criteria subject to anticipated Development Application (DA) notice and conditions by Noosa Shire Council.

                              Table 3 Receiving waters criteria

                                                      Parameter                                                         Criteria

                               Physico‐chemical
                               pH (pH units)                                                                           7.8 – 8.31
                               Dissolved oxygen (% saturation)                                                         85 – 1051
                               Suspended solids (mg/L)                                                                    ≤141
                               Turbidity (NTU)                                                                             ≤81
                               Dissolved metals (µg/L)
                               Aluminium                                                                    No relevant ANZG criteria available

                               Arsenic                                                                                    2.32*
                               Cadmium                                                                                    5.52
                               Chromium                                                                                   4.42
                               Copper                                                                                     1.32
                               Iron                                                                         No relevant ANZG criteria available

                               Lead                                                                                       4.42
                               Nickel                                                                                      702
                               Zinc                                                                                         82
                               Mercury                                                                                    0.42



                        ADG1580.23 Dewatering Management Plan_Rev0_28.09.23                                                                        Page 7




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