003 ECM_22828362_v1_Reference Document - OPW23 0189 · OPW26/0094

                                                                                                               ADG Consulting Pty Ltd


                              event, if applicable. Background samples will be recovered from the river, either upstream or
                              downstream from the receiving water location (tide dependant).

                              The proposed monitoring locations are shown in Figure 1, Appendix A are a subject to confirmation
                              following mobilisation of dewatering gear to site.

                              Monitoring will be undertaken at the following frequencies:


                                  Daily monitoring of field parameters (pH, electrical conductivity, dissolved oxygen, temperature and
                                   turbidity) in the treated discharge water and pH of the untreated extracted groundwater (to
                                   determine potential acidification). Daily monitoring will be undertaken by a suitably trained site
                                   employee under the supervision of the Site Manager.
                                  Weekly monitoring of field parameters (pH, electrical conductivity, dissolved oxygen, temperature
                                   and turbidity) in the untreated extracted groundwater, treated discharge water, receiving waters
                                   and background waters by ADG Consulting.
                                  Weekly laboratory analysis of treated discharge water and receiving waters for suspended solids
                                   and dissolved 0.45µm filterable metals (aluminium, arsenic, cadmium, chromium, copper, iron, lead,
                                   nickel, zinc and mercury). Total aluminium and iron will also be analysed for, if required.
                                  Pre‐discharge/initial monitoring of field parameters (pH, electrical conductivity, dissolved oxygen
                                   and oxidation‐reduction potential) in the extracted groundwater (prior to treatment) to assess
                                   changes in groundwater chemistry associated with PASS oxidation.
                                  Pre‐discharge/initial laboratory analysis of extracted groundwater (prior to treatment) for
                                   suspended solids, dissolved 0.45µm filterable metals (aluminium, arsenic, cadmium, chromium,
                                   copper, iron, lead, nickel, zinc and mercury) and for soluble sulfate and chloride to assess changes
                                   in groundwater chemistry associated with PASS oxidation. Total aluminium and iron will also be
                                   analysed for, if required.
                                  Laboratory analysis of untreated groundwater would also be performed periodically (monthly) if
                                   changes in untreated groundwater pH levels are detected that may indicate local acidification, and
                                   to determine any changes in local groundwaters that may require further investigation of potential
                                   environmental impacts.
                              All samples will be recovered by a suitably qualified Environmental Scientist and submitted to a National
                              Association of Testing Authorities (NATA) accredited laboratory for analysis.
                      6.5.3 Monitoring responsibilities
                              The persons responsible for undertaking the compliance monitoring described in Section 6.5.2 above are
                              shown in Table 5.

                              Table 5 Monitoring responsibilities

                                                   Activity                        Frequency        Responsibility         Person

                               Monitoring of field parameters in discharge water
                                                                                     Daily           Site Manager       Site Manager
                               and untreated extracted groundwater

                               Monitoring of field parameters in untreated
                                                                                                                       Environmental
                               extracted groundwater, discharge water,              Weekly          ADG Consulting
                                                                                                                         Consultant
                               receiving waters and background waters

                               Laboratory analysis of samples recovered from                                           Environmental
                                                                                    Weekly          ADG Consulting
                               discharge water and receiving waters                                                      Consultant

                               Monitoring of field parameters in extracted                                             Environmental
                                                                                    Weekly          ADG Consulting
                               groundwater (pre‐treated)                                                                 Consultant



                        ADG1580.23 Dewatering Management Plan_Rev0_28.09.23                                                     Page 14




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