ADG Dewatering Management Plan · OPW21/0315

                                                                                        ADG Consulting Pty Ltd



     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




ADG1290.21 Dewatering Management Plan_Rev0_12.10.21                                                       Page 13