Appendix H - Dewatering Management Plan · MCU25/0053

                                                                                                  ADG Consulting Pty Ltd

      Table 5 Monitoring responsibilities

                                  Activity                            Frequency          Responsibility      Person


          Monitoring of field parameters in discharge water               Daily          Site Manager     Site Manager


          Monitoring of field parameters in discharge water,                             Environmental    Environmental
                                                                        Weekly             Consultant
          receiving waters and background waters                                                            Consultant

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

          Monitoring of field parameters in extracted groundwater   Initially, then as   Environmental    Environmental
          (pre‐treated)                                                  required          Consultant       Consultant

          Laboratory analysis of samples recovered from extracted   Initially, then as   Environmental    Environmental
          groundwater (pre‐treated)                                      required          Consultant       Consultant

6.6   Maintenance
      The groundwater treatment systems must be regularly maintained. Maintenance must include:
          Regular cleaning and or replacement of the filter media within the filtration unit, where required to
           be installed.

             Regular removal of sediment from the sedimentation tank and backflush tank. The sediment must
              be either returned to the excavation pit for dewatering and bulking out with excavated material, or
              removed from the site by a licensed liquid waste contractor.

             Regular/required back flushing of fine media filtration treatment system.

             Regular check of the dosing system and top‐up of buffering solutions, oxidants and flocculants.
6.7   Reporting
      Dewatering management procedures and monitoring results will be reviewed by ADG Consulting weekly
      to ensure that the treatment procedures are effective, and that the receiving waters are not being
      impacted by the discharge.

      The following reporting procedures will be adopted:
          A summary report will be prepared upon completion of the initial pre‐discharge monitoring. The
           report will be submitted to the Site Manager, Dewatering Contractor and NSC (upon request).

             Weekly interim reports will be prepared upon receipt of laboratory data for each round of ongoing
              compliance monitoring. The interim reports will display all data obtained during the previous
              monitoring event, and provide comments and recommendations based on the results.

             A dewatering compliance report will be prepared on completion of the project (upon request).

      The above reports will be prepared by the Environmental Consultant and provided to the Site Manager
      and Dewatering Contractor as they become available. The reports will include all water quality results
      and comparison to the WQOs, corrective actions and recommendations made to the Site Manager and
      Dewatering Contractor during the monitoring period.

      The Site Manager must keep records of complaints, volumes of chemicals used and treatment methods
      employed. These records must be available on‐site at all times and submitted to NSC by the Site Manager
      upon request.




 ADG1777.25 Dewatering Management Plan_Rev0_01.05.25                                                              Page 16