Reference Document - OPW23 0189

                                                                                        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