Reference Document - Dewatering Management Plan (For Stamping) MCU25/0053 & OPW25/0074

                                                                                                                          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




Document Set ID: 23735664
Version: 1, Version Date: 12/05/2025